text: // AFHTTPRequestOperation.h
  //
  // Copyright (c) 2011 Gowalla (http://gowalla.com/)
  //
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  // all copies or substantial portions of the Software.
  //
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  // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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  #import <Foundation/Foundation.h>
  #import "AFURLConnectionOperation.h"
  
  /**
   `AFHTTPRequestOperation` is a subclass of `AFURLConnectionOperation` for requests using the HTTP or HTTPS protocols. It encapsulates the concept of acceptable status codes and content types, which determine the success or failure of a request.
   */
  @interface AFHTTPRequestOperation : AFURLConnectionOperation
  
  ///----------------------------------------------
  /// @name Getting HTTP URL Connection Information
  ///----------------------------------------------
  
  /**
   The last HTTP response received by the operation's connection.
   */
  @property (readonly, nonatomic, strong) NSHTTPURLResponse *response;
  
  ///----------------------------------------------------------
  /// @name Managing And Checking For Acceptable HTTP Responses
  ///----------------------------------------------------------
  
  /**
   A Boolean value that corresponds to whether the status code of the response is within the specified set of acceptable status codes. Returns `YES` if `acceptableStatusCodes` is `nil`.
   */
  @property (nonatomic, readonly) BOOL hasAcceptableStatusCode;
  
  /**
   A Boolean value that corresponds to whether the MIME type of the response is among the specified set of acceptable content types. Returns `YES` if `acceptableContentTypes` is `nil`.
   */
  @property (nonatomic, readonly) BOOL hasAcceptableContentType;
  
  /**
   The callback dispatch queue on success. If `NULL` (default), the main queue is used.
   */
  @property (nonatomic, assign) dispatch_queue_t successCallbackQueue;
  
  /**
   The callback dispatch queue on failure. If `NULL` (default), the main queue is used.
   */
  @property (nonatomic, assign) dispatch_queue_t failureCallbackQueue;
  
  ///------------------------------------------------------------
  /// @name Managing Acceptable HTTP Status Codes & Content Types
  ///------------------------------------------------------------
  
  /**
   Returns an `NSIndexSet` object containing the ranges of acceptable HTTP status codes. When non-`nil`, the operation will set the `error` property to an error in `AFErrorDomain`. See http://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html
  
   By default, this is the range 200 to 299, inclusive.
   */
  + (NSIndexSet *)acceptableStatusCodes;
  
  /**
   Adds status codes to the set of acceptable HTTP status codes returned by `+acceptableStatusCodes` in subsequent calls by this class and its descendants.
  
   @param statusCodes The status codes to be added to the set of acceptable HTTP status codes
   */
  + (void)addAcceptableStatusCodes:(NSIndexSet *)statusCodes;
  
  /**
   Returns an `NSSet` object containing the acceptable MIME types. When non-`nil`, the operation will set the `error` property to an error in `AFErrorDomain`. See http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.17
  
   By default, this is `nil`.
   */
  + (NSSet *)acceptableContentTypes;
  
  /**
   Adds content types to the set of acceptable MIME types returned by `+acceptableContentTypes` in subsequent calls by this class and its descendants.
  
   @param contentTypes The content types to be added to the set of acceptable MIME types
   */
  + (void)addAcceptableContentTypes:(NSSet *)contentTypes;
  
  
  ///-----------------------------------------------------
  /// @name Determining Whether A Request Can Be Processed
  ///-----------------------------------------------------
  
  /**
   A Boolean value determining whether or not the class can process the specified request. For example, `AFJSONRequestOperation` may check to make sure the content type was `application/json` or the URL path extension was `.json`.
  
   @param urlRequest The request that is determined to be supported or not supported for this class.
   */
  + (BOOL)canProcessRequest:(NSURLRequest *)urlRequest;
  
  ///-----------------------------------------------------------
  /// @name Setting Completion Block Success / Failure Callbacks
  ///-----------------------------------------------------------
  
  /**
   Sets the `completionBlock` property with a block that executes either the specified success or failure block, depending on the state of the request on completion. If `error` returns a value, which can be caused by an unacceptable status code or content type, then `failure` is executed. Otherwise, `success` is executed.
  
   This method should be overridden in subclasses in order to specify the response object passed into the success block.
   
   @param success The block to be executed on the completion of a successful request. This block has no return value and takes two arguments: the receiver operation and the object constructed from the response data of the request.
   @param failure The block to be executed on the completion of an unsuccessful request. This block has no return value and takes two arguments: the receiver operation and the error that occurred during the request.
   */
  - (void)setCompletionBlockWithSuccess:(void (^)(AFHTTPRequestOperation *operation, id responseObject))success
                                failure:(void (^)(AFHTTPRequestOperation *operation, NSError *error))failure;
  
  - (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data;
  @end
  
  ///----------------
  /// @name Functions
  ///----------------
  
  /**
   Returns a set of MIME types detected in an HTTP `Accept` or `Content-Type` header.
   */
  extern NSSet * AFContentTypesFromHTTPHeader(NSString *string);
  
  