text: /*
   * Copyright 2017 Google
   *
   * 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
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  
  #import <Foundation/Foundation.h>
  #import <GoogleUtilities/GULLogger.h>
  
  /// Error codes in Firebase Network error domain.
  /// Note: these error codes should never change. It would make it harder to decode the errors if
  /// we inadvertently altered any of these codes in a future SDK version.
  typedef NS_ENUM(NSInteger, GULNetworkErrorCode) {
    /// Unknown error.
    GULNetworkErrorCodeUnknown = 0,
    /// Error occurs when the request URL is invalid.
    GULErrorCodeNetworkInvalidURL = 1,
    /// Error occurs when request cannot be constructed.
    GULErrorCodeNetworkRequestCreation = 2,
    /// Error occurs when payload cannot be compressed.
    GULErrorCodeNetworkPayloadCompression = 3,
    /// Error occurs when session task cannot be created.
    GULErrorCodeNetworkSessionTaskCreation = 4,
    /// Error occurs when there is no response.
    GULErrorCodeNetworkInvalidResponse = 5
  };
  
  #pragma mark - Network constants
  
  /// The prefix of the ID of the background session.
  extern NSString *const kGULNetworkBackgroundSessionConfigIDPrefix;
  
  /// The sub directory to store the files of data that is being uploaded in the background.
  extern NSString *const kGULNetworkApplicationSupportSubdirectory;
  
  /// Name of the temporary directory that stores files for background uploading.
  extern NSString *const kGULNetworkTempDirectoryName;
  
  /// The period when the temporary uploading file can stay.
  extern const NSTimeInterval kGULNetworkTempFolderExpireTime;
  
  /// The default network request timeout interval.
  extern const NSTimeInterval kGULNetworkTimeOutInterval;
  
  /// The host to check the reachability of the network.
  extern NSString *const kGULNetworkReachabilityHost;
  
  /// The key to get the error context of the UserInfo.
  extern NSString *const kGULNetworkErrorContext;
  
  #pragma mark - Network Status Code
  
  extern const int kGULNetworkHTTPStatusOK;
  extern const int kGULNetworkHTTPStatusNoContent;
  extern const int kGULNetworkHTTPStatusCodeMultipleChoices;
  extern const int kGULNetworkHTTPStatusCodeMovedPermanently;
  extern const int kGULNetworkHTTPStatusCodeFound;
  extern const int kGULNetworkHTTPStatusCodeNotModified;
  extern const int kGULNetworkHTTPStatusCodeMovedTemporarily;
  extern const int kGULNetworkHTTPStatusCodeNotFound;
  extern const int kGULNetworkHTTPStatusCodeCannotAcceptTraffic;
  extern const int kGULNetworkHTTPStatusCodeUnavailable;
  
  #pragma mark - Error Domain
  
  extern NSString *const kGULNetworkErrorDomain;
  
  /// The logger service for GULNetwork.
  extern GULLoggerService kGULLoggerNetwork;
  