text: // Copyright (c) 2020, Google Inc.
  // All rights reserved.
  //
  // Redistribution and use in source and binary forms, with or without
  // modification, are permitted provided that the following conditions are
  // met:
  //
  //     * Redistributions of source code must retain the above copyright
  // notice, this list of conditions and the following disclaimer.
  //     * Redistributions in binary form must reproduce the above
  // copyright notice, this list of conditions and the following disclaimer
  // in the documentation and/or other materials provided with the
  // distribution.
  //     * Neither the name of Google Inc. nor the names of its
  // contributors may be used to endorse or promote products derived from
  // this software without specific prior written permission.
  //
  // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  
  #import <Foundation/Foundation.h>
  
  NS_ASSUME_NONNULL_BEGIN
  /**
   Represents a single HTTP request. Sending the request is synchronous.
   Once the send is complete, the response will be set.
  
   This is a base interface that specific HTTP requests derive from.
   It is not intended to be instantiated directly.
   */
  @interface HTTPRequest : NSObject {
   @protected
    NSURL* URL_;                   // The destination URL (STRONG)
    NSHTTPURLResponse* response_;  // The response from the send (STRONG)
  }
  
  /**
   Initializes the HTTPRequest and sets its URL.
   */
  - (id)initWithURL:(NSURL*)URL;
  
  - (NSURL*)URL;
  
  - (NSHTTPURLResponse*)response;
  
  - (NSString*)HTTPMethod;  // Internal, don't call outside class hierarchy.
  
  - (NSString*)contentType;  // Internal, don't call outside class hierarchy.
  
  - (NSData*)bodyData;  // Internal, don't call outside class hierarchy.
  
  - (NSData*)send:(NSError**)error;
  
  /**
   Appends a file to the HTTP request, either by filename or by file content
   (in the form of NSData).
   */
  + (void)appendFileToBodyData:(NSMutableData*)data
                      withName:(NSString*)name
                withFileOrData:(id)fileOrData;
  
  @end
  
  NS_ASSUME_NONNULL_END
  