text: /**
   * @license Angular v6.1.3
   * (c) 2010-2018 Google, Inc. https://angular.io/
   * License: MIT
   */
  
  (function (global, factory) {
      typeof exports === 'object' && typeof module !== 'undefined' ? factory(exports, require('@angular/core'), require('rxjs'), require('rxjs/operators'), require('@angular/common')) :
      typeof define === 'function' && define.amd ? define('@angular/common/http', ['exports', '@angular/core', 'rxjs', 'rxjs/operators', '@angular/common'], factory) :
      (factory((global.ng = global.ng || {}, global.ng.common = global.ng.common || {}, global.ng.common.http = {}),global.ng.core,global.rxjs,global.rxjs.operators,global.ng.common));
  }(this, (function (exports,core,rxjs,operators,common) { 'use strict';
  
      /**
       * @license
       * Copyright Google Inc. All Rights Reserved.
       *
       * Use of this source code is governed by an MIT-style license that can be
       * found in the LICENSE file at https://angular.io/license
       */
      /**
       * Transforms an `HttpRequest` into a stream of `HttpEvent`s, one of which will likely be a
       * `HttpResponse`.
       *
       * `HttpHandler` is injectable. When injected, the handler instance dispatches requests to the
       * first interceptor in the chain, which dispatches to the second, etc, eventually reaching the
       * `HttpBackend`.
       *
       * In an `HttpInterceptor`, the `HttpHandler` parameter is the next interceptor in the chain.
       *
       *
       */
      var HttpHandler = /** @class */ (function () {
          function HttpHandler() {
          }
          return HttpHandler;
      }());
      /**
       * A final `HttpHandler` which will dispatch the request via browser HTTP APIs to a backend.
       *
       * Interceptors sit between the `HttpClient` interface and the `HttpBackend`.
       *
       * When injected, `HttpBackend` dispatches requests directly to the backend, without going
       * through the interceptor chain.
       *
       *
       */
      var HttpBackend = /** @class */ (function () {
          function HttpBackend() {
          }
          return HttpBackend;
      }());
  
      /*! *****************************************************************************
      Copyright (c) Microsoft Corporation. All rights reserved.
      Licensed under the Apache License, Version 2.0 (the "License"); you may not use
      this file except in compliance with the License. You may obtain a copy of the
      License at http://www.apache.org/licenses/LICENSE-2.0
  
      THIS CODE IS PROVIDED ON AN *AS IS* BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
      KIND, EITHER EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION ANY IMPLIED
      WARRANTIES OR CONDITIONS OF TITLE, FITNESS FOR A PARTICULAR PURPOSE,
      MERCHANTABLITY OR NON-INFRINGEMENT.
  
      See the Apache Version 2.0 License for specific language governing permissions
      and limitations under the License.
      ***************************************************************************** */
      /* global Reflect, Promise */
  
      var extendStatics = function(d, b) {
          extendStatics = Object.setPrototypeOf ||
              ({ __proto__: [] } instanceof Array && function (d, b) { d.__proto__ = b; }) ||
              function (d, b) { for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p]; };
          return extendStatics(d, b);
      };
  
      function __extends(d, b) {
          extendStatics(d, b);
          function __() { this.constructor = d; }
          d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
      }
  
      function __read(o, n) {
          var m = typeof Symbol === "function" && o[Symbol.iterator];
          if (!m) return o;
          var i = m.call(o), r, ar = [], e;
          try {
              while ((n === void 0 || n-- > 0) && !(r = i.next()).done) ar.push(r.value);
          }
          catch (error) { e = { error: error }; }
          finally {
              try {
                  if (r && !r.done && (m = i["return"])) m.call(i);
              }
              finally { if (e) throw e.error; }
          }
          return ar;
      }
  
      function __spread() {
          for (var ar = [], i = 0; i < arguments.length; i++)
              ar = ar.concat(__read(arguments[i]));
          return ar;
      }
  
      /**
       * @license
       * Copyright Google Inc. All Rights Reserved.
       *
       * Use of this source code is governed by an MIT-style license that can be
       * found in the LICENSE file at https://angular.io/license
       */
      /**
       * Immutable set of Http headers, with lazy parsing.
       *
       */
      var HttpHeaders = /** @class */ (function () {
          function HttpHeaders(headers) {
              var _this = this;
              /**
               * Internal map of lowercased header names to the normalized
               * form of the name (the form seen first).
               */
              this.normalizedNames = new Map();
              /**
               * Queued updates to be materialized the next initialization.
               */
              this.lazyUpdate = null;
              if (!headers) {
                  this.headers = new Map();
              }
              else if (typeof headers === 'string') {
                  this.lazyInit = function () {
                      _this.headers = new Map();
                      headers.split('\n').forEach(function (line) {
                          var index = line.indexOf(':');
                          if (index > 0) {
                              var name_1 = line.slice(0, index);
                              var key = name_1.toLowerCase();
                              var value = line.slice(index + 1).trim();
                              _this.maybeSetNormalizedName(name_1, key);
                              if (_this.headers.has(key)) {
                                  _this.headers.get(key).push(value);
                              }
                              else {
                                  _this.headers.set(key, [value]);
                              }
                          }
                      });
                  };
              }
              else {
                  this.lazyInit = function () {
                      _this.headers = new Map();
                      Object.keys(headers).forEach(function (name) {
                          var values = headers[name];
                          var key = name.toLowerCase();
                          if (typeof values === 'string') {
                              values = [values];
                          }
                          if (values.length > 0) {
                              _this.headers.set(key, values);
                              _this.maybeSetNormalizedName(name, key);
                          }
                      });
                  };
              }
          }
          /**
           * Checks for existence of header by given name.
           */
          HttpHeaders.prototype.has = function (name) {
              this.init();
              return this.headers.has(name.toLowerCase());
          };
          /**
           * Returns first header that matches given name.
           */
          HttpHeaders.prototype.get = function (name) {
              this.init();
              var values = this.headers.get(name.toLowerCase());
              return values && values.length > 0 ? values[0] : null;
          };
          /**
           * Returns the names of the headers
           */
          HttpHeaders.prototype.keys = function () {
              this.init();
              return Array.from(this.normalizedNames.values());
          };
          /**
           * Returns list of header values for a given name.
           */
          HttpHeaders.prototype.getAll = function (name) {
              this.init();
              return this.headers.get(name.toLowerCase()) || null;
          };
          HttpHeaders.prototype.append = function (name, value) {
              return this.clone({ name: name, value: value, op: 'a' });
          };
          HttpHeaders.prototype.set = function (name, value) {
              return this.clone({ name: name, value: value, op: 's' });
          };
          HttpHeaders.prototype.delete = function (name, value) {
              return this.clone({ name: name, value: value, op: 'd' });
          };
          HttpHeaders.prototype.maybeSetNormalizedName = function (name, lcName) {
              if (!this.normalizedNames.has(lcName)) {
                  this.normalizedNames.set(lcName, name);
              }
          };
          HttpHeaders.prototype.init = function () {
              var _this = this;
              if (!!this.lazyInit) {
                  if (this.lazyInit instanceof HttpHeaders) {
                      this.copyFrom(this.lazyInit);
                  }
                  else {
                      this.lazyInit();
                  }
                  this.lazyInit = null;
                  if (!!this.lazyUpdate) {
                      this.lazyUpdate.forEach(function (update) { return _this.applyUpdate(update); });
                      this.lazyUpdate = null;
                  }
              }
          };
          HttpHeaders.prototype.copyFrom = function (other) {
              var _this = this;
              other.init();
              Array.from(other.headers.keys()).forEach(function (key) {
                  _this.headers.set(key, other.headers.get(key));
                  _this.normalizedNames.set(key, other.normalizedNames.get(key));
              });
          };
          HttpHeaders.prototype.clone = function (update) {
              var clone = new HttpHeaders();
              clone.lazyInit =
                  (!!this.lazyInit && this.lazyInit instanceof HttpHeaders) ? this.lazyInit : this;
              clone.lazyUpdate = (this.lazyUpdate || []).concat([update]);
              return clone;
          };
          HttpHeaders.prototype.applyUpdate = function (update) {
              var key = update.name.toLowerCase();
              switch (update.op) {
                  case 'a':
                  case 's':
                      var value = update.value;
                      if (typeof value === 'string') {
                          value = [value];
                      }
                      if (value.length === 0) {
                          return;
                      }
                      this.maybeSetNormalizedName(update.name, key);
                      var base = (update.op === 'a' ? this.headers.get(key) : undefined) || [];
                      base.push.apply(base, __spread(value));
                      this.headers.set(key, base);
                      break;
                  case 'd':
                      var toDelete_1 = update.value;
                      if (!toDelete_1) {
                          this.headers.delete(key);
                          this.normalizedNames.delete(key);
                      }
                      else {
                          var existing = this.headers.get(key);
                          if (!existing) {
                              return;
                          }
                          existing = existing.filter(function (value) { return toDelete_1.indexOf(value) === -1; });
                          if (existing.length === 0) {
                              this.headers.delete(key);
                              this.normalizedNames.delete(key);
                          }
                          else {
                              this.headers.set(key, existing);
                          }
                      }
                      break;
              }
          };
          /**
           * @internal
           */
          HttpHeaders.prototype.forEach = function (fn) {
              var _this = this;
              this.init();
              Array.from(this.normalizedNames.keys())
                  .forEach(function (key) { return fn(_this.normalizedNames.get(key), _this.headers.get(key)); });
          };
          return HttpHeaders;
      }());
  
      /**
       * @license
       * Copyright Google Inc. All Rights Reserved.
       *
       * Use of this source code is governed by an MIT-style license that can be
       * found in the LICENSE file at https://angular.io/license
       */
      /**
       * A `HttpParameterCodec` that uses `encodeURIComponent` and `decodeURIComponent` to
       * serialize and parse URL parameter keys and values.
       *
       *
       */
      var HttpUrlEncodingCodec = /** @class */ (function () {
          function HttpUrlEncodingCodec() {
          }
          HttpUrlEncodingCodec.prototype.encodeKey = function (key) { return standardEncoding(key); };
          HttpUrlEncodingCodec.prototype.encodeValue = function (value) { return standardEncoding(value); };
          HttpUrlEncodingCodec.prototype.decodeKey = function (key) { return decodeURIComponent(key); };
          HttpUrlEncodingCodec.prototype.decodeValue = function (value) { return decodeURIComponent(value); };
          return HttpUrlEncodingCodec;
      }());
      function paramParser(rawParams, codec) {
          var map = new Map();
          if (rawParams.length > 0) {
              var params = rawParams.split('&');
              params.forEach(function (param) {
                  var eqIdx = param.indexOf('=');
                  var _a = __read(eqIdx == -1 ?
                      [codec.decodeKey(param), ''] :
                      [codec.decodeKey(param.slice(0, eqIdx)), codec.decodeValue(param.slice(eqIdx + 1))], 2), key = _a[0], val = _a[1];
                  var list = map.get(key) || [];
                  list.push(val);
                  map.set(key, list);
              });
          }
          return map;
      }
      function standardEncoding(v) {
          return encodeURIComponent(v)
              .replace(/%40/gi, '@')
              .replace(/%3A/gi, ':')
              .replace(/%24/gi, '$')
              .replace(/%2C/gi, ',')
              .replace(/%3B/gi, ';')
              .replace(/%2B/gi, '+')
              .replace(/%3D/gi, '=')
              .replace(/%3F/gi, '?')
              .replace(/%2F/gi, '/');
      }
      /**
       * An HTTP request/response body that represents serialized parameters,
       * per the MIME type `application/x-www-form-urlencoded`.
       *
       * This class is immutable - all mutation operations return a new instance.
       *
       *
       */
      var HttpParams = /** @class */ (function () {
          function HttpParams(options) {
              if (options === void 0) { options = {}; }
              var _this = this;
              this.updates = null;
              this.cloneFrom = null;
              this.encoder = options.encoder || new HttpUrlEncodingCodec();
              if (!!options.fromString) {
                  if (!!options.fromObject) {
                      throw new Error("Cannot specify both fromString and fromObject.");
                  }
                  this.map = paramParser(options.fromString, this.encoder);
              }
              else if (!!options.fromObject) {
                  this.map = new Map();
                  Object.keys(options.fromObject).forEach(function (key) {
                      var value = options.fromObject[key];
                      _this.map.set(key, Array.isArray(value) ? value : [value]);
                  });
              }
              else {
                  this.map = null;
              }
          }
          /**
           * Check whether the body has one or more values for the given parameter name.
           */
          HttpParams.prototype.has = function (param) {
              this.init();
              return this.map.has(param);
          };
          /**
           * Get the first value for the given parameter name, or `null` if it's not present.
           */
          HttpParams.prototype.get = function (param) {
              this.init();
              var res = this.map.get(param);
              return !!res ? res[0] : null;
          };
          /**
           * Get all values for the given parameter name, or `null` if it's not present.
           */
          HttpParams.prototype.getAll = function (param) {
              this.init();
              return this.map.get(param) || null;
          };
          /**
           * Get all the parameter names for this body.
           */
          HttpParams.prototype.keys = function () {
              this.init();
              return Array.from(this.map.keys());
          };
          /**
           * Construct a new body with an appended value for the given parameter name.
           */
          HttpParams.prototype.append = function (param, value) { return this.clone({ param: param, value: value, op: 'a' }); };
          /**
           * Construct a new body with a new value for the given parameter name.
           */
          HttpParams.prototype.set = function (param, value) { return this.clone({ param: param, value: value, op: 's' }); };
          /**
           * Construct a new body with either the given value for the given parameter
           * removed, if a value is given, or all values for the given parameter removed
           * if not.
           */
          HttpParams.prototype.delete = function (param, value) { return this.clone({ param: param, value: value, op: 'd' }); };
          /**
           * Serialize the body to an encoded string, where key-value pairs (separated by `=`) are
           * separated by `&`s.
           */
          HttpParams.prototype.toString = function () {
              var _this = this;
              this.init();
              return this.keys()
                  .map(function (key) {
                  var eKey = _this.encoder.encodeKey(key);
                  return _this.map.get(key).map(function (value) { return eKey + '=' + _this.encoder.encodeValue(value); })
                      .join('&');
              })
                  .join('&');
          };
          HttpParams.prototype.clone = function (update) {
              var clone = new HttpParams({ encoder: this.encoder });
              clone.cloneFrom = this.cloneFrom || this;
              clone.updates = (this.updates || []).concat([update]);
              return clone;
          };
          HttpParams.prototype.init = function () {
              var _this = this;
              if (this.map === null) {
                  this.map = new Map();
              }
              if (this.cloneFrom !== null) {
                  this.cloneFrom.init();
                  this.cloneFrom.keys().forEach(function (key) { return _this.map.set(key, _this.cloneFrom.map.get(key)); });
                  this.updates.forEach(function (update) {
                      switch (update.op) {
                          case 'a':
                          case 's':
                              var base = (update.op === 'a' ? _this.map.get(update.param) : undefined) || [];
                              base.push(update.value);
                              _this.map.set(update.param, base);
                              break;
                          case 'd':
                              if (update.value !== undefined) {
                                  var base_1 = _this.map.get(update.param) || [];
                                  var idx = base_1.indexOf(update.value);
                                  if (idx !== -1) {
                                      base_1.splice(idx, 1);
                                  }
                                  if (base_1.length > 0) {
                                      _this.map.set(update.param, base_1);
                                  }
                                  else {
                                      _this.map.delete(update.param);
                                  }
                              }
                              else {
                                  _this.map.delete(update.param);
                                  break;
                              }
                      }
                  });
                  this.cloneFrom = null;
              }
          };
          return HttpParams;
      }());
  
      /**
       * @license
       * Copyright Google Inc. All Rights Reserved.
       *
       * Use of this source code is governed by an MIT-style license that can be
       * found in the LICENSE file at https://angular.io/license
       */
      /**
       * Determine whether the given HTTP method may include a body.
       */
      function mightHaveBody(method) {
          switch (method) {
              case 'DELETE':
              case 'GET':
              case 'HEAD':
              case 'OPTIONS':
              case 'JSONP':
                  return false;
              default:
                  return true;
          }
      }
      /**
       * Safely assert whether the given value is an ArrayBuffer.
       *
       * In some execution environments ArrayBuffer is not defined.
       */
      function isArrayBuffer(value) {
          return typeof ArrayBuffer !== 'undefined' && value instanceof ArrayBuffer;
      }
      /**
       * Safely assert whether the given value is a Blob.
       *
       * In some execution environments Blob is not defined.
       */
      function isBlob(value) {
          return typeof Blob !== 'undefined' && value instanceof Blob;
      }
      /**
       * Safely assert whether the given value is a FormData instance.
       *
       * In some execution environments FormData is not defined.
       */
      function isFormData(value) {
          return typeof FormData !== 'undefined' && value instanceof FormData;
      }
      /**
       * An outgoing HTTP request with an optional typed body.
       *
       * `HttpRequest` represents an outgoing request, including URL, method,
       * headers, body, and other request configuration options. Instances should be
       * assumed to be immutable. To modify a `HttpRequest`, the `clone`
       * method should be used.
       *
       *
       */
      var HttpRequest = /** @class */ (function () {
          function HttpRequest(method, url, third, fourth) {
              this.url = url;
              /**
               * The request body, or `null` if one isn't set.
               *
               * Bodies are not enforced to be immutable, as they can include a reference to any
               * user-defined data type. However, interceptors should take care to preserve
               * idempotence by treating them as such.
               */
              this.body = null;
              /**
               * Whether this request should be made in a way that exposes progress events.
               *
               * Progress events are expensive (change detection runs on each event) and so
               * they should only be requested if the consumer intends to monitor them.
               */
              this.reportProgress = false;
              /**
               * Whether this request should be sent with outgoing credentials (cookies).
               */
              this.withCredentials = false;
              /**
               * The expected response type of the server.
               *
               * This is used to parse the response appropriately before returning it to
               * the requestee.
               */
              this.responseType = 'json';
              this.method = method.toUpperCase();
              // Next, need to figure out which argument holds the HttpRequestInit
              // options, if any.
              var options;
              // Check whether a body argument is expected. The only valid way to omit
              // the body argument is to use a known no-body method like GET.
              if (mightHaveBody(this.method) || !!fourth) {
                  // Body is the third argument, options are the fourth.
                  this.body = (third !== undefined) ? third : null;
                  options = fourth;
              }
              else {
                  // No body required, options are the third argument. The body stays null.
                  options = third;
              }
              // If options have been passed, interpret them.
              if (options) {
                  // Normalize reportProgress and withCredentials.
                  this.reportProgress = !!options.reportProgress;
                  this.withCredentials = !!options.withCredentials;
                  // Override default response type of 'json' if one is provided.
                  if (!!options.responseType) {
                      this.responseType = options.responseType;
                  }
                  // Override headers if they're provided.
                  if (!!options.headers) {
                      this.headers = options.headers;
                  }
                  if (!!options.params) {
                      this.params = options.params;
                  }
              }
              // If no headers have been passed in, construct a new HttpHeaders instance.
              if (!this.headers) {
                  this.headers = new HttpHeaders();
              }
              // If no parameters have been passed in, construct a new HttpUrlEncodedParams instance.
              if (!this.params) {
                  this.params = new HttpParams();
                  this.urlWithParams = url;
              }
              else {
                  // Encode the parameters to a string in preparation for inclusion in the URL.
                  var params = this.params.toString();
                  if (params.length === 0) {
                      // No parameters, the visible URL is just the URL given at creation time.
                      this.urlWithParams = url;
                  }
                  else {
                      // Does the URL already have query parameters? Look for '?'.
                      var qIdx = url.indexOf('?');
                      // There are 3 cases to handle:
                      // 1) No existing parameters -> append '?' followed by params.
                      // 2) '?' exists and is followed by existing query string ->
                      //    append '&' followed by params.
                      // 3) '?' exists at the end of the url -> append params directly.
                      // This basically amounts to determining the character, if any, with
                      // which to join the URL and parameters.
                      var sep = qIdx === -1 ? '?' : (qIdx < url.length - 1 ? '&' : '');
                      this.urlWithParams = url + sep + params;
                  }
              }
          }
          /**
           * Transform the free-form body into a serialized format suitable for
           * transmission to the server.
           */
          HttpRequest.prototype.serializeBody = function () {
              // If no body is present, no need to serialize it.
              if (this.body === null) {
                  return null;
              }
              // Check whether the body is already in a serialized form. If so,
              // it can just be returned directly.
              if (isArrayBuffer(this.body) || isBlob(this.body) || isFormData(this.body) ||
                  typeof this.body === 'string') {
                  return this.body;
              }
              // Check whether the body is an instance of HttpUrlEncodedParams.
              if (this.body instanceof HttpParams) {
                  return this.body.toString();
              }
              // Check whether the body is an object or array, and serialize with JSON if so.
              if (typeof this.body === 'object' || typeof this.body === 'boolean' ||
                  Array.isArray(this.body)) {
                  return JSON.stringify(this.body);
              }
              // Fall back on toString() for everything else.
              return this.body.toString();
          };
          /**
           * Examine the body and attempt to infer an appropriate MIME type
           * for it.
           *
           * If no such type can be inferred, this method will return `null`.
           */
          HttpRequest.prototype.detectContentTypeHeader = function () {
              // An empty body has no content type.
              if (this.body === null) {
                  return null;
              }
              // FormData bodies rely on the browser's content type assignment.
              if (isFormData(this.body)) {
                  return null;
              }
              // Blobs usually have their own content type. If it doesn't, then
              // no type can be inferred.
              if (isBlob(this.body)) {
                  return this.body.type || null;
              }
              // Array buffers have unknown contents and thus no type can be inferred.
              if (isArrayBuffer(this.body)) {
                  return null;
              }
              // Technically, strings could be a form of JSON data, but it's safe enough
              // to assume they're plain strings.
              if (typeof this.body === 'string') {
                  return 'text/plain';
              }
              // `HttpUrlEncodedParams` has its own content-type.
              if (this.body instanceof HttpParams) {
                  return 'application/x-www-form-urlencoded;charset=UTF-8';
              }
              // Arrays, objects, and numbers will be encoded as JSON.
              if (typeof this.body === 'object' || typeof this.body === 'number' ||
                  Array.isArray(this.body)) {
                  return 'application/json';
              }
              // No type could be inferred.
              return null;
          };
          HttpRequest.prototype.clone = function (update) {
              if (update === void 0) { update = {}; }
              // For method, url, and responseType, take the current value unless
              // it is overridden in the update hash.
              var method = update.method || this.method;
              var url = update.url || this.url;
              var responseType = update.responseType || this.responseType;
              // The body is somewhat special - a `null` value in update.body means
              // whatever current body is present is being overridden with an empty
              // body, whereas an `undefined` value in update.body implies no
              // override.
              var body = (update.body !== undefined) ? update.body : this.body;
              // Carefully handle the boolean options to differentiate between
              // `false` and `undefined` in the update args.
              var withCredentials = (update.withCredentials !== undefined) ? update.withCredentials : this.withCredentials;
              var reportProgress = (update.reportProgress !== undefined) ? update.reportProgress : this.reportProgress;
              // Headers and params may be appended to if `setHeaders` or
              // `setParams` are used.
              var headers = update.headers || this.headers;
              var params = update.params || this.params;
              // Check whether the caller has asked to add headers.
              if (update.setHeaders !== undefined) {
                  // Set every requested header.
                  headers =
                      Object.keys(update.setHeaders)
                          .reduce(function (headers, name) { return headers.set(name, update.setHeaders[name]); }, headers);
              }
              // Check whether the caller has asked to set params.
              if (update.setParams) {
                  // Set every requested param.
                  params = Object.keys(update.setParams)
                      .reduce(function (params, param) { return params.set(param, update.setParams[param]); }, params);
              }
              // Finally, construct the new HttpRequest using the pieces from above.
              return new HttpRequest(method, url, body, {
                  params: params, headers: headers, reportProgress: reportProgress, responseType: responseType, withCredentials: withCredentials,
              });
          };
          return HttpRequest;
      }());
  
      /**
       * @license
       * Copyright Google Inc. All Rights Reserved.
       *
       * Use of this source code is governed by an MIT-style license that can be
       * found in the LICENSE file at https://angular.io/license
       */
      (function (HttpEventType) {
          /**
           * The request was sent out over the wire.
           */
          HttpEventType[HttpEventType["Sent"] = 0] = "Sent";
          /**
           * An upload progress event was received.
           */
          HttpEventType[HttpEventType["UploadProgress"] = 1] = "UploadProgress";
          /**
           * The response status code and headers were received.
           */
          HttpEventType[HttpEventType["ResponseHeader"] = 2] = "ResponseHeader";
          /**
           * A download progress event was received.
           */
          HttpEventType[HttpEventType["DownloadProgress"] = 3] = "DownloadProgress";
          /**
           * The full response including the body was received.
           */
          HttpEventType[HttpEventType["Response"] = 4] = "Response";
          /**
           * A custom event from an interceptor or a backend.
           */
          HttpEventType[HttpEventType["User"] = 5] = "User";
      })(exports.HttpEventType || (exports.HttpEventType = {}));
      /**
       * Base class for both `HttpResponse` and `HttpHeaderResponse`.
       *
       *
       */
      var HttpResponseBase = /** @class */ (function () {
          /**
           * Super-constructor for all responses.
           *
           * The single parameter accepted is an initialization hash. Any properties
           * of the response passed there will override the default values.
           */
          function HttpResponseBase(init, defaultStatus, defaultStatusText) {
              if (defaultStatus === void 0) { defaultStatus = 200; }
              if (defaultStatusText === void 0) { defaultStatusText = 'OK'; }
              // If the hash has values passed, use them to initialize the response.
              // Otherwise use the default values.
              this.headers = init.headers || new HttpHeaders();
              this.status = init.status !== undefined ? init.status : defaultStatus;
              this.statusText = init.statusText || defaultStatusText;
              this.url = init.url || null;
              // Cache the ok value to avoid defining a getter.
              this.ok = this.status >= 200 && this.status < 300;
          }
          return HttpResponseBase;
      }());
      /**
       * A partial HTTP response which only includes the status and header data,
       * but no response body.
       *
       * `HttpHeaderResponse` is a `HttpEvent` available on the response
       * event stream, only when progress events are requested.
       *
       *
       */
      var HttpHeaderResponse = /** @class */ (function (_super) {
          __extends(HttpHeaderResponse, _super);
          /**
           * Create a new `HttpHeaderResponse` with the given parameters.
           */
          function HttpHeaderResponse(init) {
              if (init === void 0) { init = {}; }
              var _this = _super.call(this, init) || this;
              _this.type = exports.HttpEventType.ResponseHeader;
              return _this;
          }
          /**
           * Copy this `HttpHeaderResponse`, overriding its contents with the
           * given parameter hash.
           */
          HttpHeaderResponse.prototype.clone = function (update) {
              if (update === void 0) { update = {}; }
              // Perform a straightforward initialization of the new HttpHeaderResponse,
              // overriding the current parameters with new ones if given.
              return new HttpHeaderResponse({
                  headers: update.headers || this.headers,
                  status: update.status !== undefined ? update.status : this.status,
                  statusText: update.statusText || this.statusText,
                  url: update.url || this.url || undefined,
              });
          };
          return HttpHeaderResponse;
      }(HttpResponseBase));
      /**
       * A full HTTP response, including a typed response body (which may be `null`
       * if one was not returned).
       *
       * `HttpResponse` is a `HttpEvent` available on the response event
       * stream.
       *
       *
       */
      var HttpResponse = /** @class */ (function (_super) {
          __extends(HttpResponse, _super);
          /**
           * Construct a new `HttpResponse`.
           */
          function HttpResponse(init) {
              if (init === void 0) { init = {}; }
              var _this = _super.call(this, init) || this;
              _this.type = exports.HttpEventType.Response;
              _this.body = init.body !== undefined ? init.body : null;
              return _this;
          }
          HttpResponse.prototype.clone = function (update) {
              if (update === void 0) { update = {}; }
              return new HttpResponse({
                  body: (update.body !== undefined) ? update.body : this.body,
                  headers: update.headers || this.headers,
                  status: (update.status !== undefined) ? update.status : this.status,
                  statusText: update.statusText || this.statusText,
                  url: update.url || this.url || undefined,
              });
          };
          return HttpResponse;
      }(HttpResponseBase));
      /**
       * A response that represents an error or failure, either from a
       * non-successful HTTP status, an error while executing the request,
       * or some other failure which occurred during the parsing of the response.
       *
       * Any error returned on the `Observable` response stream will be
       * wrapped in an `HttpErrorResponse` to provide additional context about
       * the state of the HTTP layer when the error occurred. The error property
       * will contain either a wrapped Error object or the error response returned
       * from the server.
       *
       *
       */
      var HttpErrorResponse = /** @class */ (function (_super) {
          __extends(HttpErrorResponse, _super);
          function HttpErrorResponse(init) {
              var _this = 
              // Initialize with a default status of 0 / Unknown Error.
              _super.call(this, init, 0, 'Unknown Error') || this;
              _this.name = 'HttpErrorResponse';
              /**
               * Errors are never okay, even when the status code is in the 2xx success range.
               */
              _this.ok = false;
              // If the response was successful, then this was a parse error. Otherwise, it was
              // a protocol-level failure of some sort. Either the request failed in transit
              // or the server returned an unsuccessful status code.
              if (_this.status >= 200 && _this.status < 300) {
                  _this.message = "Http failure during parsing for " + (init.url || '(unknown url)');
              }
              else {
                  _this.message =
                      "Http failure response for " + (init.url || '(unknown url)') + ": " + init.status + " " + init.statusText;
              }
              _this.error = init.error || null;
              return _this;
          }
          return HttpErrorResponse;
      }(HttpResponseBase));
  
      /**
       * @license
       * Copyright Google Inc. All Rights Reserved.
       *
       * Use of this source code is governed by an MIT-style license that can be
       * found in the LICENSE file at https://angular.io/license
       */
      /**
       * Construct an instance of `HttpRequestOptions<T>` from a source `HttpMethodOptions` and
       * the given `body`. Basically, this clones the object and adds the body.
       */
      function addBody(options, body) {
          return {
              body: body,
              headers: options.headers,
              observe: options.observe,
              params: options.params,
              reportProgress: options.reportProgress,
              responseType: options.responseType,
              withCredentials: options.withCredentials,
          };
      }
      /**
       * Perform HTTP requests.
       *
       * `HttpClient` is available as an injectable class, with methods to perform HTTP requests.
       * Each request method has multiple signatures, and the return type varies according to which
       * signature is called (mainly the values of `observe` and `responseType`).
       *
       *
       */
      var HttpClient = /** @class */ (function () {
          function HttpClient(handler) {
              this.handler = handler;
          }
          /**
           * Constructs an `Observable` for a particular HTTP request that, when subscribed,
           * fires the request through the chain of registered interceptors and on to the
           * server.
           *
           * This method can be called in one of two ways. Either an `HttpRequest`
           * instance can be passed directly as the only parameter, or a method can be
           * passed as the first parameter, a string URL as the second, and an
           * options hash as the third.
           *
           * If a `HttpRequest` object is passed directly, an `Observable` of the
           * raw `HttpEvent` stream will be returned.
           *
           * If a request is instead built by providing a URL, the options object
           * determines the return type of `request()`. In addition to configuring
           * request parameters such as the outgoing headers and/or the body, the options
           * hash specifies two key pieces of information about the request: the
           * `responseType` and what to `observe`.
           *
           * The `responseType` value determines how a successful response body will be
           * parsed. If `responseType` is the default `json`, a type interface for the
           * resulting object may be passed as a type parameter to `request()`.
           *
           * The `observe` value determines the return type of `request()`, based on what
           * the consumer is interested in observing. A value of `events` will return an
           * `Observable<HttpEvent>` representing the raw `HttpEvent` stream,
           * including progress events by default. A value of `response` will return an
           * `Observable<HttpResponse<T>>` where the `T` parameter of `HttpResponse`
           * depends on the `responseType` and any optionally provided type parameter.
           * A value of `body` will return an `Observable<T>` with the same `T` body type.
           */
          HttpClient.prototype.request = function (first, url, options) {
              var _this = this;
              if (options === void 0) { options = {}; }
              var req;
              // Firstly, check whether the primary argument is an instance of `HttpRequest`.
              if (first instanceof HttpRequest) {
                  // It is. The other arguments must be undefined (per the signatures) and can be
                  // ignored.
                  req = first;
              }
              else {
                  // It's a string, so it represents a URL. Construct a request based on it,
                  // and incorporate the remaining arguments (assuming GET unless a method is
                  // provided.
                  // Figure out the headers.
                  var headers = undefined;
                  if (options.headers instanceof HttpHeaders) {
                      headers = options.headers;
                  }
                  else {
                      headers = new HttpHeaders(options.headers);
                  }
                  // Sort out parameters.
                  var params = undefined;
                  if (!!options.params) {
                      if (options.params instanceof HttpParams) {
                          params = options.params;
                      }
                      else {
                          params = new HttpParams({ fromObject: options.params });
                      }
                  }
                  // Construct the request.
                  req = new HttpRequest(first, url, (options.body !== undefined ? options.body : null), {
                      headers: headers,
                      params: params,
                      reportProgress: options.reportProgress,
                      // By default, JSON is assumed to be returned for all calls.
                      responseType: options.responseType || 'json',
                      withCredentials: options.withCredentials,
                  });
              }
              // Start with an Observable.of() the initial request, and run the handler (which
              // includes all interceptors) inside a concatMap(). This way, the handler runs
              // inside an Observable chain, which causes interceptors to be re-run on every
              // subscription (this also makes retries re-run the handler, including interceptors).
              var events$ = rxjs.of(req).pipe(operators.concatMap(function (req) { return _this.handler.handle(req); }));
              // If coming via the API signature which accepts a previously constructed HttpRequest,
              // the only option is to get the event stream. Otherwise, return the event stream if
              // that is what was requested.
              if (first instanceof HttpRequest || options.observe === 'events') {
                  return events$;
              }
              // The requested stream contains either the full response or the body. In either
              // case, the first step is to filter the event stream to extract a stream of
              // responses(s).
              var res$ = events$.pipe(operators.filter(function (event) { return event instanceof HttpResponse; }));
              // Decide which stream to return.
              switch (options.observe || 'body') {
                  case 'body':
                      // The requested stream is the body. Map the response stream to the response
                      // body. This could be done more simply, but a misbehaving interceptor might
                      // transform the response body into a different format and ignore the requested
                      // responseType. Guard against this by validating that the response is of the
                      // requested type.
                      switch (req.responseType) {
                          case 'arraybuffer':
                              return res$.pipe(operators.map(function (res) {
                                  // Validate that the body is an ArrayBuffer.
                                  if (res.body !== null && !(res.body instanceof ArrayBuffer)) {
                                      throw new Error('Response is not an ArrayBuffer.');
                                  }
                                  return res.body;
                              }));
                          case 'blob':
                              return res$.pipe(operators.map(function (res) {
                                  // Validate that the body is a Blob.
                                  if (res.body !== null && !(res.body instanceof Blob)) {
                                      throw new Error('Response is not a Blob.');
                                  }
                                  return res.body;
                              }));
                          case 'text':
                              return res$.pipe(operators.map(function (res) {
                                  // Validate that the body is a string.
                                  if (res.body !== null && typeof res.body !== 'string') {
                                      throw new Error('Response is not a string.');
                                  }
                                  return res.body;
                              }));
                          case 'json':
                          default:
                              // No validation needed for JSON responses, as they can be of any type.
                              return res$.pipe(operators.map(function (res) { return res.body; }));
                      }
                  case 'response':
                      // The response stream was requested directly, so return it.
                      return res$;
                  default:
                      // Guard against new future observe types being added.
                      throw new Error("Unreachable: unhandled observe type " + options.observe + "}");
              }
          };
          /**
           * Constructs an `Observable` which, when subscribed, will cause the configured
           * DELETE request to be executed on the server. See the individual overloads for
           * details of `delete()`'s return type based on the provided options.
           */
          HttpClient.prototype.delete = function (url, options) {
              if (options === void 0) { options = {}; }
              return this.request('DELETE', url, options);
          };
          /**
           * Constructs an `Observable` which, when subscribed, will cause the configured
           * GET request to be executed on the server. See the individual overloads for
           * details of `get()`'s return type based on the provided options.
           */
          HttpClient.prototype.get = function (url, options) {
              if (options === void 0) { options = {}; }
              return this.request('GET', url, options);
          };
          /**
           * Constructs an `Observable` which, when subscribed, will cause the configured
           * HEAD request to be executed on the server. See the individual overloads for
           * details of `head()`'s return type based on the provided options.
           */
          HttpClient.prototype.head = function (url, options) {
              if (options === void 0) { options = {}; }
              return this.request('HEAD', url, options);
          };
          /**
           * Constructs an `Observable` which, when subscribed, will cause a request
           * with the special method `JSONP` to be dispatched via the interceptor pipeline.
           *
           * A suitable interceptor must be installed (e.g. via the `HttpClientJsonpModule`).
           * If no such interceptor is reached, then the `JSONP` request will likely be
           * rejected by the configured backend.
           */
          HttpClient.prototype.jsonp = function (url, callbackParam) {
              return this.request('JSONP', url, {
                  params: new HttpParams().append(callbackParam, 'JSONP_CALLBACK'),
                  observe: 'body',
                  responseType: 'json',
              });
          };
          /**
           * Constructs an `Observable` which, when subscribed, will cause the configured
           * OPTIONS request to be executed on the server. See the individual overloads for
           * details of `options()`'s return type based on the provided options.
           */
          HttpClient.prototype.options = function (url, options) {
              if (options === void 0) { options = {}; }
              return this.request('OPTIONS', url, options);
          };
          /**
           * Constructs an `Observable` which, when subscribed, will cause the configured
           * PATCH request to be executed on the server. See the individual overloads for
           * details of `patch()`'s return type based on the provided options.
           */
          HttpClient.prototype.patch = function (url, body, options) {
              if (options === void 0) { options = {}; }
              return this.request('PATCH', url, addBody(options, body));
          };
          /**
           * Constructs an `Observable` which, when subscribed, will cause the configured
           * POST request to be executed on the server. See the individual overloads for
           * details of `post()`'s return type based on the provided options.
           */
          HttpClient.prototype.post = function (url, body, options) {
              if (options === void 0) { options = {}; }
              return this.request('POST', url, addBody(options, body));
          };
          /**
           * Constructs an `Observable` which, when subscribed, will cause the configured
           * PUT request to be executed on the server. See the individual overloads for
           * details of `put()`'s return type based on the provided options.
           */
          HttpClient.prototype.put = function (url, body, options) {
              if (options === void 0) { options = {}; }
              return this.request('PUT', url, addBody(options, body));
          };
          HttpClient.decorators = [
              { type: core.Injectable }
          ];
          /** @nocollapse */
          HttpClient.ctorParameters = function () { return [
              { type: HttpHandler }
          ]; };
          return HttpClient;
      }());
  
      /**
       * @license
       * Copyright Google Inc. All Rights Reserved.
       *
       * Use of this source code is governed by an MIT-style license that can be
       * found in the LICENSE file at https://angular.io/license
       */
      /**
       * `HttpHandler` which applies an `HttpInterceptor` to an `HttpRequest`.
       *
       *
       */
      var HttpInterceptorHandler = /** @class */ (function () {
          function HttpInterceptorHandler(next, interceptor) {
              this.next = next;
              this.interceptor = interceptor;
          }
          HttpInterceptorHandler.prototype.handle = function (req) {
              return this.interceptor.intercept(req, this.next);
          };
          return HttpInterceptorHandler;
      }());
      /**
       * A multi-provider token which represents the array of `HttpInterceptor`s that
       * are registered.
       *
       *
       */
      var HTTP_INTERCEPTORS = new core.InjectionToken('HTTP_INTERCEPTORS');
      var NoopInterceptor = /** @class */ (function () {
          function NoopInterceptor() {
          }
          NoopInterceptor.prototype.intercept = function (req, next) {
              return next.handle(req);
          };
          NoopInterceptor.decorators = [
              { type: core.Injectable }
          ];
          return NoopInterceptor;
      }());
  
      /**
       * @license
       * Copyright Google Inc. All Rights Reserved.
       *
       * Use of this source code is governed by an MIT-style license that can be
       * found in the LICENSE file at https://angular.io/license
       */
      // Every request made through JSONP needs a callback name that's unique across the
      // whole page. Each request is assigned an id and the callback name is constructed
      // from that. The next id to be assigned is tracked in a global variable here that
      // is shared among all applications on the page.
      var nextRequestId = 0;
      // Error text given when a JSONP script is injected, but doesn't invoke the callback
      // passed in its URL.
      var JSONP_ERR_NO_CALLBACK = 'JSONP injected script did not invoke callback.';
      // Error text given when a request is passed to the JsonpClientBackend that doesn't
      // have a request method JSONP.
      var JSONP_ERR_WRONG_METHOD = 'JSONP requests must use JSONP request method.';
      var JSONP_ERR_WRONG_RESPONSE_TYPE = 'JSONP requests must use Json response type.';
      /**
       * DI token/abstract type representing a map of JSONP callbacks.
       *
       * In the browser, this should always be the `window` object.
       *
       *
       */
      var JsonpCallbackContext = /** @class */ (function () {
          function JsonpCallbackContext() {
          }
          return JsonpCallbackContext;
      }());
      /**
       * `HttpBackend` that only processes `HttpRequest` with the JSONP method,
       * by performing JSONP style requests.
       *
       *
       */
      var JsonpClientBackend = /** @class */ (function () {
          function JsonpClientBackend(callbackMap, document) {
              this.callbackMap = callbackMap;
              this.document = document;
          }
          /**
           * Get the name of the next callback method, by incrementing the global `nextRequestId`.
           */
          JsonpClientBackend.prototype.nextCallback = function () { return "ng_jsonp_callback_" + nextRequestId++; };
          /**
           * Process a JSONP request and return an event stream of the results.
           */
          JsonpClientBackend.prototype.handle = function (req) {
              var _this = this;
              // Firstly, check both the method and response type. If either doesn't match
              // then the request was improperly routed here and cannot be handled.
              if (req.method !== 'JSONP') {
                  throw new Error(JSONP_ERR_WRONG_METHOD);
              }
              else if (req.responseType !== 'json') {
                  throw new Error(JSONP_ERR_WRONG_RESPONSE_TYPE);
              }
              // Everything else happens inside the Observable boundary.
              return new rxjs.Observable(function (observer) {
                  // The first step to make a request is to generate the callback name, and replace the
                  // callback placeholder in the URL with the name. Care has to be taken here to ensure
                  // a trailing &, if matched, gets inserted back into the URL in the correct place.
                  var callback = _this.nextCallback();
                  var url = req.urlWithParams.replace(/=JSONP_CALLBACK(&|$)/, "=" + callback + "$1");
                  // Construct the <script> tag and point it at the URL.
                  var node = _this.document.createElement('script');
                  node.src = url;
                  // A JSONP request requires waiting for multiple callbacks. These variables
                  // are closed over and track state across those callbacks.
                  // The response object, if one has been received, or null otherwise.
                  var body = null;
                  // Whether the response callback has been called.
                  var finished = false;
                  // Whether the request has been cancelled (and thus any other callbacks)
                  // should be ignored.
                  var cancelled = false;
                  // Set the response callback in this.callbackMap (which will be the window
                  // object in the browser. The script being loaded via the <script> tag will
                  // eventually call this callback.
                  _this.callbackMap[callback] = function (data) {
                      // Data has been received from the JSONP script. Firstly, delete this callback.
                      delete _this.callbackMap[callback];
                      // Next, make sure the request wasn't cancelled in the meantime.
                      if (cancelled) {
                          return;
                      }
                      // Set state to indicate data was received.
                      body = data;
                      finished = true;
                  };
                  // cleanup() is a utility closure that removes the <script> from the page and
                  // the response callback from the window. This logic is used in both the
                  // success, error, and cancellation paths, so it's extracted out for convenience.
                  var cleanup = function () {
                      // Remove the <script> tag if it's still on the page.
                      if (node.parentNode) {
                          node.parentNode.removeChild(node);
                      }
                      // Remove the response callback from the callbackMap (window object in the
                      // browser).
                      delete _this.callbackMap[callback];
                  };
                  // onLoad() is the success callback which runs after the response callback
                  // if the JSONP script loads successfully. The event itself is unimportant.
                  // If something went wrong, onLoad() may run without the response callback
                  // having been invoked.
                  var onLoad = function (event) {
                      // Do nothing if the request has been cancelled.
                      if (cancelled) {
                          return;
                      }
                      // Cleanup the page.
                      cleanup();
                      // Check whether the response callback has run.
                      if (!finished) {
                          // It hasn't, something went wrong with the request. Return an error via
                          // the Observable error path. All JSONP errors have status 0.
                          observer.error(new HttpErrorResponse({
                              url: url,
                              status: 0,
                              statusText: 'JSONP Error',
                              error: new Error(JSONP_ERR_NO_CALLBACK),
                          }));
                          return;
                      }
                      // Success. body either contains the response body or null if none was
                      // returned.
                      observer.next(new HttpResponse({
                          body: body,
                          status: 200,
                          statusText: 'OK', url: url,
                      }));
                      // Complete the stream, the response is over.
                      observer.complete();
                  };
                  // onError() is the error callback, which runs if the script returned generates
                  // a Javascript error. It emits the error via the Observable error channel as
                  // a HttpErrorResponse.
                  var onError = function (error) {
                      // If the request was already cancelled, no need to emit anything.
                      if (cancelled) {
                          return;
                      }
                      cleanup();
                      // Wrap the error in a HttpErrorResponse.
                      observer.error(new HttpErrorResponse({
                          error: error,
                          status: 0,
                          statusText: 'JSONP Error', url: url,
                      }));
                  };
                  // Subscribe to both the success (load) and error events on the <script> tag,
                  // and add it to the page.
                  node.addEventListener('load', onLoad);
                  node.addEventListener('error', onError);
                  _this.document.body.appendChild(node);
                  // The request has now been successfully sent.
                  observer.next({ type: exports.HttpEventType.Sent });
                  // Cancellation handler.
                  return function () {
                      // Track the cancellation so event listeners won't do anything even if already scheduled.
                      cancelled = true;
                      // Remove the event listeners so they won't run if the events later fire.
                      node.removeEventListener('load', onLoad);
                      node.removeEventListener('error', onError);
                      // And finally, clean up the page.
                      cleanup();
                  };
              });
          };
          JsonpClientBackend.decorators = [
              { type: core.Injectable }
          ];
          /** @nocollapse */
          JsonpClientBackend.ctorParameters = function () { return [
              { type: JsonpCallbackContext },
              { type: undefined, decorators: [{ type: core.Inject, args: [common.DOCUMENT,] }] }
          ]; };
          return JsonpClientBackend;
      }());
      /**
       * An `HttpInterceptor` which identifies requests with the method JSONP and
       * shifts them to the `JsonpClientBackend`.
       *
       *
       */
      var JsonpInterceptor = /** @class */ (function () {
          function JsonpInterceptor(jsonp) {
              this.jsonp = jsonp;
          }
          JsonpInterceptor.prototype.intercept = function (req, next) {
              if (req.method === 'JSONP') {
                  return this.jsonp.handle(req);
              }
              // Fall through for normal HTTP requests.
              return next.handle(req);
          };
          JsonpInterceptor.decorators = [
              { type: core.Injectable }
          ];
          /** @nocollapse */
          JsonpInterceptor.ctorParameters = function () { return [
              { type: JsonpClientBackend }
          ]; };
          return JsonpInterceptor;
      }());
  
      /**
       * @license
       * Copyright Google Inc. All Rights Reserved.
       *
       * Use of this source code is governed by an MIT-style license that can be
       * found in the LICENSE file at https://angular.io/license
       */
      var XSSI_PREFIX = /^\)\]\}',?\n/;
      /**
       * Determine an appropriate URL for the response, by checking either
       * XMLHttpRequest.responseURL or the X-Request-URL header.
       */
      function getResponseUrl(xhr) {
          if ('responseURL' in xhr && xhr.responseURL) {
              return xhr.responseURL;
          }
          if (/^X-Request-URL:/m.test(xhr.getAllResponseHeaders())) {
              return xhr.getResponseHeader('X-Request-URL');
          }
          return null;
      }
      /**
       * A wrapper around the `XMLHttpRequest` constructor.
       *
       *
       */
      var XhrFactory = /** @class */ (function () {
          function XhrFactory() {
          }
          return XhrFactory;
      }());
      /**
       * A factory for @{link HttpXhrBackend} that uses the `XMLHttpRequest` browser API.
       *
       *
       */
      var BrowserXhr = /** @class */ (function () {
          function BrowserXhr() {
          }
          BrowserXhr.prototype.build = function () { return (new XMLHttpRequest()); };
          BrowserXhr.decorators = [
              { type: core.Injectable }
          ];
          /** @nocollapse */
          BrowserXhr.ctorParameters = function () { return []; };
          return BrowserXhr;
      }());
      /**
       * An `HttpBackend` which uses the XMLHttpRequest API to send
       * requests to a backend server.
       *
       *
       */
      var HttpXhrBackend = /** @class */ (function () {
          function HttpXhrBackend(xhrFactory) {
              this.xhrFactory = xhrFactory;
          }
          /**
           * Process a request and return a stream of response events.
           */
          HttpXhrBackend.prototype.handle = function (req) {
              var _this = this;
              // Quick check to give a better error message when a user attempts to use
              // HttpClient.jsonp() without installing the JsonpClientModule
              if (req.method === 'JSONP') {
                  throw new Error("Attempted to construct Jsonp request without JsonpClientModule installed.");
              }
              // Everything happens on Observable subscription.
              return new rxjs.Observable(function (observer) {
                  // Start by setting up the XHR object with request method, URL, and withCredentials flag.
                  var xhr = _this.xhrFactory.build();
                  xhr.open(req.method, req.urlWithParams);
                  if (!!req.withCredentials) {
                      xhr.withCredentials = true;
                  }
                  // Add all the requested headers.
                  req.headers.forEach(function (name, values) { return xhr.setRequestHeader(name, values.join(',')); });
                  // Add an Accept header if one isn't present already.
                  if (!req.headers.has('Accept')) {
                      xhr.setRequestHeader('Accept', 'application/json, text/plain, */*');
                  }
                  // Auto-detect the Content-Type header if one isn't present already.
                  if (!req.headers.has('Content-Type')) {
                      var detectedType = req.detectContentTypeHeader();
                      // Sometimes Content-Type detection fails.
                      if (detectedType !== null) {
                          xhr.setRequestHeader('Content-Type', detectedType);
                      }
                  }
                  // Set the responseType if one was requested.
                  if (req.responseType) {
                      var responseType = req.responseType.toLowerCase();
                      // JSON responses need to be processed as text. This is because if the server
                      // returns an XSSI-prefixed JSON response, the browser will fail to parse it,
                      // xhr.response will be null, and xhr.responseText cannot be accessed to
                      // retrieve the prefixed JSON data in order to strip the prefix. Thus, all JSON
                      // is parsed by first requesting text and then applying JSON.parse.
                      xhr.responseType = ((responseType !== 'json') ? responseType : 'text');
                  }
                  // Serialize the request body if one is present. If not, this will be set to null.
                  var reqBody = req.serializeBody();
                  // If progress events are enabled, response headers will be delivered
                  // in two events - the HttpHeaderResponse event and the full HttpResponse
                  // event. However, since response headers don't change in between these
                  // two events, it doesn't make sense to parse them twice. So headerResponse
                  // caches the data extracted from the response whenever it's first parsed,
                  // to ensure parsing isn't duplicated.
                  var headerResponse = null;
                  // partialFromXhr extracts the HttpHeaderResponse from the current XMLHttpRequest
                  // state, and memoizes it into headerResponse.
                  var partialFromXhr = function () {
                      if (headerResponse !== null) {
                          return headerResponse;
                      }
                      // Read status and normalize an IE9 bug (http://bugs.jquery.com/ticket/1450).
                      var status = xhr.status === 1223 ? 204 : xhr.status;
                      var statusText = xhr.statusText || 'OK';
                      // Parse headers from XMLHttpRequest - this step is lazy.
                      var headers = new HttpHeaders(xhr.getAllResponseHeaders());
                      // Read the response URL from the XMLHttpResponse instance and fall back on the
                      // request URL.
                      var url = getResponseUrl(xhr) || req.url;
                      // Construct the HttpHeaderResponse and memoize it.
                      headerResponse = new HttpHeaderResponse({ headers: headers, status: status, statusText: statusText, url: url });
                      return headerResponse;
                  };
                  // Next, a few closures are defined for the various events which XMLHttpRequest can
                  // emit. This allows them to be unregistered as event listeners later.
                  // First up is the load event, which represents a response being fully available.
                  var onLoad = function () {
                      // Read response state from the memoized partial data.
                      var _a = partialFromXhr(), headers = _a.headers, status = _a.status, statusText = _a.statusText, url = _a.url;
                      // The body will be read out if present.
                      var body = null;
                      if (status !== 204) {
                          // Use XMLHttpRequest.response if set, responseText otherwise.
                          body = (typeof xhr.response === 'undefined') ? xhr.responseText : xhr.response;
                      }
                      // Normalize another potential bug (this one comes from CORS).
                      if (status === 0) {
                          status = !!body ? 200 : 0;
                      }
                      // ok determines whether the response will be transmitted on the event or
                      // error channel. Unsuccessful status codes (not 2xx) will always be errors,
                      // but a successful status code can still result in an error if the user
                      // asked for JSON data and the body cannot be parsed as such.
                      var ok = status >= 200 && status < 300;
                      // Check whether the body needs to be parsed as JSON (in many cases the browser
                      // will have done that already).
                      if (req.responseType === 'json' && typeof body === 'string') {
                          // Save the original body, before attempting XSSI prefix stripping.
                          var originalBody = body;
                          body = body.replace(XSSI_PREFIX, '');
                          try {
                              // Attempt the parse. If it fails, a parse error should be delivered to the user.
                              body = body !== '' ? JSON.parse(body) : null;
                          }
                          catch (error) {
                              // Since the JSON.parse failed, it's reasonable to assume this might not have been a
                              // JSON response. Restore the original body (including any XSSI prefix) to deliver
                              // a better error response.
                              body = originalBody;
                              // If this was an error request to begin with, leave it as a string, it probably
                              // just isn't JSON. Otherwise, deliver the parsing error to the user.
                              if (ok) {
                                  // Even though the response status was 2xx, this is still an error.
                                  ok = false;
                                  // The parse error contains the text of the body that failed to parse.
                                  body = { error: error, text: body };
                              }
                          }
                      }
                      if (ok) {
                          // A successful response is delivered on the event stream.
                          observer.next(new HttpResponse({
                              body: body,
                              headers: headers,
                              status: status,
                              statusText: statusText,
                              url: url || undefined,
                          }));
                          // The full body has been received and delivered, no further events
                          // are possible. This request is complete.
                          observer.complete();
                      }
                      else {
                          // An unsuccessful request is delivered on the error channel.
                          observer.error(new HttpErrorResponse({
                              // The error in this case is the response body (error from the server).
                              error: body,
                              headers: headers,
                              status: status,
                              statusText: statusText,
                              url: url || undefined,
                          }));
                      }
                  };
                  // The onError callback is called when something goes wrong at the network level.
                  // Connection timeout, DNS error, offline, etc. These are actual errors, and are
                  // transmitted on the error channel.
                  var onError = function (error) {
                      var res = new HttpErrorResponse({
                          error: error,
                          status: xhr.status || 0,
                          statusText: xhr.statusText || 'Unknown Error',
                      });
                      observer.error(res);
                  };
                  // The sentHeaders flag tracks whether the HttpResponseHeaders event
                  // has been sent on the stream. This is necessary to track if progress
                  // is enabled since the event will be sent on only the first download
                  // progerss event.
                  var sentHeaders = false;
                  // The download progress event handler, which is only registered if
                  // progress events are enabled.
                  var onDownProgress = function (event) {
                      // Send the HttpResponseHeaders event if it hasn't been sent already.
                      if (!sentHeaders) {
                          observer.next(partialFromXhr());
                          sentHeaders = true;
                      }
                      // Start building the download progress event to deliver on the response
                      // event stream.
                      var progressEvent = {
                          type: exports.HttpEventType.DownloadProgress,
                          loaded: event.loaded,
                      };
                      // Set the total number of bytes in the event if it's available.
                      if (event.lengthComputable) {
                          progressEvent.total = event.total;
                      }
                      // If the request was for text content and a partial response is
                      // available on XMLHttpRequest, include it in the progress event
                      // to allow for streaming reads.
                      if (req.responseType === 'text' && !!xhr.responseText) {
                          progressEvent.partialText = xhr.responseText;
                      }
                      // Finally, fire the event.
                      observer.next(progressEvent);
                  };
                  // The upload progress event handler, which is only registered if
                  // progress events are enabled.
                  var onUpProgress = function (event) {
                      // Upload progress events are simpler. Begin building the progress
                      // event.
                      var progress = {
                          type: exports.HttpEventType.UploadProgress,
                          loaded: event.loaded,
                      };
                      // If the total number of bytes being uploaded is available, include
                      // it.
                      if (event.lengthComputable) {
                          progress.total = event.total;
                      }
                      // Send the event.
                      observer.next(progress);
                  };
                  // By default, register for load and error events.
                  xhr.addEventListener('load', onLoad);
                  xhr.addEventListener('error', onError);
                  // Progress events are only enabled if requested.
                  if (req.reportProgress) {
                      // Download progress is always enabled if requested.
                      xhr.addEventListener('progress', onDownProgress);
                      // Upload progress depends on whether there is a body to upload.
                      if (reqBody !== null && xhr.upload) {
                          xhr.upload.addEventListener('progress', onUpProgress);
                      }
                  }
                  // Fire the request, and notify the event stream that it was fired.
                  xhr.send(reqBody);
                  observer.next({ type: exports.HttpEventType.Sent });
                  // This is the return from the Observable function, which is the
                  // request cancellation handler.
                  return function () {
                      // On a cancellation, remove all registered event listeners.
                      xhr.removeEventListener('error', onError);
                      xhr.removeEventListener('load', onLoad);
                      if (req.reportProgress) {
                          xhr.removeEventListener('progress', onDownProgress);
                          if (reqBody !== null && xhr.upload) {
                              xhr.upload.removeEventListener('progress', onUpProgress);
                          }
                      }
                      // Finally, abort the in-flight request.
                      xhr.abort();
                  };
              });
          };
          HttpXhrBackend.decorators = [
              { type: core.Injectable }
          ];
          /** @nocollapse */
          HttpXhrBackend.ctorParameters = function () { return [
              { type: XhrFactory }
          ]; };
          return HttpXhrBackend;
      }());
  
      /**
       * @license
       * Copyright Google Inc. All Rights Reserved.
       *
       * Use of this source code is governed by an MIT-style license that can be
       * found in the LICENSE file at https://angular.io/license
       */
      var XSRF_COOKIE_NAME = new core.InjectionToken('XSRF_COOKIE_NAME');
      var XSRF_HEADER_NAME = new core.InjectionToken('XSRF_HEADER_NAME');
      /**
       * Retrieves the current XSRF token to use with the next outgoing request.
       *
       *
       */
      var HttpXsrfTokenExtractor = /** @class */ (function () {
          function HttpXsrfTokenExtractor() {
          }
          return HttpXsrfTokenExtractor;
      }());
      /**
       * `HttpXsrfTokenExtractor` which retrieves the token from a cookie.
       */
      var HttpXsrfCookieExtractor = /** @class */ (function () {
          function HttpXsrfCookieExtractor(doc, platform, cookieName) {
              this.doc = doc;
              this.platform = platform;
              this.cookieName = cookieName;
              this.lastCookieString = '';
              this.lastToken = null;
              /**
               * @internal for testing
               */
              this.parseCount = 0;
          }
          HttpXsrfCookieExtractor.prototype.getToken = function () {
              if (this.platform === 'server') {
                  return null;
              }
              var cookieString = this.doc.cookie || '';
              if (cookieString !== this.lastCookieString) {
                  this.parseCount++;
                  this.lastToken = common.ɵparseCookieValue(cookieString, this.cookieName);
                  this.lastCookieString = cookieString;
              }
              return this.lastToken;
          };
          HttpXsrfCookieExtractor.decorators = [
              { type: core.Injectable }
          ];
          /** @nocollapse */
          HttpXsrfCookieExtractor.ctorParameters = function () { return [
              { type: undefined, decorators: [{ type: core.Inject, args: [common.DOCUMENT,] }] },
              { type: String, decorators: [{ type: core.Inject, args: [core.PLATFORM_ID,] }] },
              { type: String, decorators: [{ type: core.Inject, args: [XSRF_COOKIE_NAME,] }] }
          ]; };
          return HttpXsrfCookieExtractor;
      }());
      /**
       * `HttpInterceptor` which adds an XSRF token to eligible outgoing requests.
       */
      var HttpXsrfInterceptor = /** @class */ (function () {
          function HttpXsrfInterceptor(tokenService, headerName) {
              this.tokenService = tokenService;
              this.headerName = headerName;
          }
          HttpXsrfInterceptor.prototype.intercept = function (req, next) {
              var lcUrl = req.url.toLowerCase();
              // Skip both non-mutating requests and absolute URLs.
              // Non-mutating requests don't require a token, and absolute URLs require special handling
              // anyway as the cookie set
              // on our origin is not the same as the token expected by another origin.
              if (req.method === 'GET' || req.method === 'HEAD' || lcUrl.startsWith('http://') ||
                  lcUrl.startsWith('https://')) {
                  return next.handle(req);
              }
              var token = this.tokenService.getToken();
              // Be careful not to overwrite an existing header of the same name.
              if (token !== null && !req.headers.has(this.headerName)) {
                  req = req.clone({ headers: req.headers.set(this.headerName, token) });
              }
              return next.handle(req);
          };
          HttpXsrfInterceptor.decorators = [
              { type: core.Injectable }
          ];
          /** @nocollapse */
          HttpXsrfInterceptor.ctorParameters = function () { return [
              { type: HttpXsrfTokenExtractor },
              { type: String, decorators: [{ type: core.Inject, args: [XSRF_HEADER_NAME,] }] }
          ]; };
          return HttpXsrfInterceptor;
      }());
  
      /**
       * @license
       * Copyright Google Inc. All Rights Reserved.
       *
       * Use of this source code is governed by an MIT-style license that can be
       * found in the LICENSE file at https://angular.io/license
       */
      /**
       * An injectable `HttpHandler` that applies multiple interceptors
       * to a request before passing it to the given `HttpBackend`.
       *
       * The interceptors are loaded lazily from the injector, to allow
       * interceptors to themselves inject classes depending indirectly
       * on `HttpInterceptingHandler` itself.
       * @see `HttpInterceptor`
       */
      var HttpInterceptingHandler = /** @class */ (function () {
          function HttpInterceptingHandler(backend, injector) {
              this.backend = backend;
              this.injector = injector;
              this.chain = null;
          }
          HttpInterceptingHandler.prototype.handle = function (req) {
              if (this.chain === null) {
                  var interceptors = this.injector.get(HTTP_INTERCEPTORS, []);
                  this.chain = interceptors.reduceRight(function (next, interceptor) { return new HttpInterceptorHandler(next, interceptor); }, this.backend);
              }
              return this.chain.handle(req);
          };
          HttpInterceptingHandler.decorators = [
              { type: core.Injectable }
          ];
          /** @nocollapse */
          HttpInterceptingHandler.ctorParameters = function () { return [
              { type: HttpBackend },
              { type: core.Injector }
          ]; };
          return HttpInterceptingHandler;
      }());
      /**
       * Factory function that determines where to store JSONP callbacks.
       *
       * Ordinarily JSONP callbacks are stored on the `window` object, but this may not exist
       * in test environments. In that case, callbacks are stored on an anonymous object instead.
       *
       *
       */
      function jsonpCallbackContext() {
          if (typeof window === 'object') {
              return window;
          }
          return {};
      }
      /**
       * An NgModule that adds XSRF protection support to outgoing requests.
       *
       * For a server that supports a cookie-based XSRF protection system,
       * use directly to configure XSRF protection with the correct
       * cookie and header names.
       *
       * If no names are supplied, the default cookie name is `XSRF-TOKEN`
       * and the default header name is `X-XSRF-TOKEN`.
       *
       *
       */
      var HttpClientXsrfModule = /** @class */ (function () {
          function HttpClientXsrfModule() {
          }
          /**
           * Disable the default XSRF protection.
           */
          HttpClientXsrfModule.disable = function () {
              return {
                  ngModule: HttpClientXsrfModule,
                  providers: [
                      { provide: HttpXsrfInterceptor, useClass: NoopInterceptor },
                  ],
              };
          };
          /**
           * Configure XSRF protection.
           * @param options An object that can specify either or both
           * cookie name or header name.
           * - Cookie name default is `XSRF-TOKEN`.
           * - Header name default is `X-XSRF-TOKEN`.
           *
           */
          HttpClientXsrfModule.withOptions = function (options) {
              if (options === void 0) { options = {}; }
              return {
                  ngModule: HttpClientXsrfModule,
                  providers: [
                      options.cookieName ? { provide: XSRF_COOKIE_NAME, useValue: options.cookieName } : [],
                      options.headerName ? { provide: XSRF_HEADER_NAME, useValue: options.headerName } : [],
                  ],
              };
          };
          HttpClientXsrfModule.decorators = [
              { type: core.NgModule, args: [{
                          providers: [
                              HttpXsrfInterceptor,
                              { provide: HTTP_INTERCEPTORS, useExisting: HttpXsrfInterceptor, multi: true },
                              { provide: HttpXsrfTokenExtractor, useClass: HttpXsrfCookieExtractor },
                              { provide: XSRF_COOKIE_NAME, useValue: 'XSRF-TOKEN' },
                              { provide: XSRF_HEADER_NAME, useValue: 'X-XSRF-TOKEN' },
                          ],
                      },] }
          ];
          return HttpClientXsrfModule;
      }());
      /**
       * An NgModule that provides the `HttpClient` and associated services.
       *
       * Interceptors can be added to the chain behind `HttpClient` by binding them
       * to the multiprovider for `HTTP_INTERCEPTORS`.
       *
       *
       */
      var HttpClientModule = /** @class */ (function () {
          function HttpClientModule() {
          }
          HttpClientModule.decorators = [
              { type: core.NgModule, args: [{
                          /**
                           * Optional configuration for XSRF protection.
                           */
                          imports: [
                              HttpClientXsrfModule.withOptions({
                                  cookieName: 'XSRF-TOKEN',
                                  headerName: 'X-XSRF-TOKEN',
                              }),
                          ],
                          /**
                           * The module provides `HttpClient` itself, and supporting services.
                           */
                          providers: [
                              HttpClient,
                              { provide: HttpHandler, useClass: HttpInterceptingHandler },
                              HttpXhrBackend,
                              { provide: HttpBackend, useExisting: HttpXhrBackend },
                              BrowserXhr,
                              { provide: XhrFactory, useExisting: BrowserXhr },
                          ],
                      },] }
          ];
          return HttpClientModule;
      }());
      /**
       * An NgModule that enables JSONP support in `HttpClient`.
       *
       * Without this module, Jsonp requests will reach the backend
       * with method JSONP, where they'll be rejected.
       *
       *
       */
      var HttpClientJsonpModule = /** @class */ (function () {
          function HttpClientJsonpModule() {
          }
          HttpClientJsonpModule.decorators = [
              { type: core.NgModule, args: [{
                          providers: [
                              JsonpClientBackend,
                              { provide: JsonpCallbackContext, useFactory: jsonpCallbackContext },
                              { provide: HTTP_INTERCEPTORS, useClass: JsonpInterceptor, multi: true },
                          ],
                      },] }
          ];
          return HttpClientJsonpModule;
      }());
  
      /**
       * @license
       * Copyright Google Inc. All Rights Reserved.
       *
       * Use of this source code is governed by an MIT-style license that can be
       * found in the LICENSE file at https://angular.io/license
       */
  
      /**
       * @license
       * Copyright Google Inc. All Rights Reserved.
       *
       * Use of this source code is governed by an MIT-style license that can be
       * found in the LICENSE file at https://angular.io/license
       */
  
      /**
       * Generated bundle index. Do not edit.
       */
  
      exports.ɵangular_packages_common_http_http_a = NoopInterceptor;
      exports.ɵangular_packages_common_http_http_b = JsonpCallbackContext;
      exports.ɵangular_packages_common_http_http_c = jsonpCallbackContext;
      exports.ɵangular_packages_common_http_http_d = BrowserXhr;
      exports.ɵangular_packages_common_http_http_g = HttpXsrfCookieExtractor;
      exports.ɵangular_packages_common_http_http_h = HttpXsrfInterceptor;
      exports.ɵangular_packages_common_http_http_e = XSRF_COOKIE_NAME;
      exports.ɵangular_packages_common_http_http_f = XSRF_HEADER_NAME;
      exports.HttpBackend = HttpBackend;
      exports.HttpHandler = HttpHandler;
      exports.HttpClient = HttpClient;
      exports.HttpHeaders = HttpHeaders;
      exports.HTTP_INTERCEPTORS = HTTP_INTERCEPTORS;
      exports.JsonpClientBackend = JsonpClientBackend;
      exports.JsonpInterceptor = JsonpInterceptor;
      exports.HttpClientJsonpModule = HttpClientJsonpModule;
      exports.HttpClientModule = HttpClientModule;
      exports.HttpClientXsrfModule = HttpClientXsrfModule;
      exports.ɵHttpInterceptingHandler = HttpInterceptingHandler;
      exports.HttpParams = HttpParams;
      exports.HttpUrlEncodingCodec = HttpUrlEncodingCodec;
      exports.HttpRequest = HttpRequest;
      exports.HttpErrorResponse = HttpErrorResponse;
      exports.HttpHeaderResponse = HttpHeaderResponse;
      exports.HttpResponse = HttpResponse;
      exports.HttpResponseBase = HttpResponseBase;
      exports.HttpXhrBackend = HttpXhrBackend;
      exports.XhrFactory = XhrFactory;
      exports.HttpXsrfTokenExtractor = HttpXsrfTokenExtractor;
  
      Object.defineProperty(exports, '__esModule', { value: true });
  
  })));
  //# sourceMappingURL=common-http.umd.js.map
  