#import <Foundation/Foundation.h>
// Network
#import "Three20Network/TTURLRequestCachePolicy.h"
// Core
#import "Three20Core/TTCorePreprocessorMacros.h"// For __TTDEPRECATED_METHOD
@protocol TTURLRequestDelegate;
@protocol TTURLResponse;
@interface TTURLRequest : NSObject {NSString*             _urlPath;             //url路径NSString*             _httpMethod;     //http方法NSData*               _httpBody;          //http体NSMutableDictionary*  _parameters;  //参数NSMutableDictionary*  _headers;       //http头NSString*             _contentType;           //内容类型NSStringEncoding      _charsetForMultipart;  //字符集编码NSMutableArray*       _files;                     //上传多个文件id<TTURLResponse>     _response;       TTURLRequestCachePolicy _cachePolicy;         //缓存代理NSTimeInterval          _cacheExpirationAge;        //缓存实效时间，默认是1天NSString*               _cacheKey;                               //缓存keyNSDate*               _timestamp;                                NSInteger             _totalBytesLoaded;               //已经加载的字节数      NSInteger             _totalBytesExpected;           //预计下载的字节数NSInteger             _totalBytesDownloaded;      //下载的总字节数NSInteger             _totalContentLength;         //总的内容长度id    _userInfo;                                                 //用户信息BOOL  _isLoading;                                         //是否正在加载BOOL  _shouldHandleCookies;                   //是否处理cookeBOOL  _respondedFromCache;                    //是否从缓存里面取BOOL  _filterPasswordLogging;                  //记录密码日志NSMutableArray* _delegates;
}
/*** 请求加载的url路径*/
@property (nonatomic, copy) NSString* urlPath;
/**同上，已经不再使用了，用urlPath代替*/
@property (nonatomic, copy) NSString* URL__TTDEPRECATED_METHOD;
/*** 请求的http 方法名字* @example @"POST"* @example @"GET"* @example @"PUT"* @默认 (t @"GET")*/
@property (nonatomic, copy) NSString* httpMethod;
/* * 一个处理response data 并且可以解析和验证的对象, 下面几个是处理的类型, 其中TTURLXMLResponse需要添加一个扩展框架 extThree20XML* @see TTURLDataResponse* @see TTURLImageResponse* @see TTURLXMLResponse*/
@property (nonatomic, retain) id<TTURLResponse> response;
/***  请求发送的Http  body* 如果提供了，就会一直使用.  当你使用POST或put方法的时候 ，先确定下。 *  如果httpBody提供了，那么post或put  data 会从parameters属性 里面生成，不会被使用*/
@property (nonatomic, retain) NSData* httpBody;
/*** 请求数据的内容类型 The content type of the data in the request.* 如果没有提供，并且httpMethod是post或 put ，那么contentType 是@"multipart/form-data".*/
@property (nonatomic, copy) NSString* contentType;
/***  HTTP POST/PUT方法的参数*/
@property (nonatomic, readonly) NSMutableDictionary* parameters;
/*** 自定义HTTP headers.*/
@property (nonatomic, readonly) NSMutableDictionary* headers;
/*** @默认缓存： TTURLRequestCachePolicyDefault*/
@property (nonatomic)TTURLRequestCachePolicy cachePolicy;
/***  设置response缓存数据的最长时间*默认是TT_DEFAULT_CACHE_EXPIRATION_AGE (1 week)*/
@property (nonatomic)NSTimeInterval cacheExpirationAge;
/*** 如果没有cache key, 那么唯一的key是从request data生成的。*如果请求是post或put，那么post或put参数也会使用cache key生成的。*如果设置了cache key ,你可以覆盖默认的cache key,使用你自己的。*/
@property (nonatomic, copy) NSString* cacheKey;
/*** 一个虚拟的对象，用来标识请求的唯一对象标识*生成TTUserInfo对象会在这里使用* @see TTUserInfo*/
@property (nonatomic, retain) id userInfo;
@property (nonatomic, retain) NSDate* timestamp;
/*** 当前请求是否激活了*/
@property (nonatomic) BOOL isLoading;
/*** 请求是否使用默认的cookie处理* @param YES if cookies should be sent with and set for this request;*        otherwise NO.* @discussion The default is YES - 相反cookies are sent from and*             stored to the cookie manager by default.* @default YES*/
@property (nonatomic)BOOL shouldHandleCookies;
/*** 请求已经加载的字节数*/
@property (nonatomic)NSInteger totalBytesLoaded;
/*** 请求预计要加载的字节数*/
@property (nonatomic)NSInteger totalBytesExpected;
/***已经从服务器上下载的总字节数*/
@property (nonatomic)NSInteger totalBytesDownloaded;
/***  请求的总内容长度*/
@property (nonatomic)NSInteger totalContentLength;
/*** 是否从缓存加载* 前提是请求已经加载完成*/
@property (nonatomic)BOOL respondedFromCache;
/**
名字为密码的参数是否要记录日志.*/
@property (nonatomic,assign) BOOL filterPasswordLogging;
/*** 当创建multipart/form-data  数据使用的字符集 ** @默认是 NSUTF8StringEncoding */
@property (nonatomic)NSStringEncoding charsetForMultipart;
/*** An array of non-retained objects that receive messages about the progress of the request.*/
@property (nonatomic, readonly) NSMutableArray* delegates;
+ (TTURLRequest*)request;
+ (TTURLRequest*)requestWithURL:(NSString*)URL delegate:(id/*<TTURLRequestDelegate>*/)delegate;
- (id)initWithURL:(NSString*)URL delegate:(id/*<TTURLRequestDelegate>*/)delegate;
- (void)setValue:(NSString *)value forHTTPHeaderField:(NSString *)field;
/***添加一个文件，整个文件数据发送出去*/
- (void)addFile:(NSData*)data mimeType:(NSString*)mimeType fileName:(NSString*)fileName;
/*** 尝试发送一个请求*如果请求可以通过缓存来处理，就是同步请求*   否则这个就是异步请求。* @return YES  如果请求从缓存加载的话，就是同步请求*/
- (BOOL)send;
/*** 尝试发送一个同步请求*不管数据是从网络取还是从缓存取，都会使用同步请求*/
- (BOOL)sendSynchronously;
/*** 取消请求*如果是多个相同的url请求，其他的不会取消*/
- (void)cancel;
- (NSURLRequest*)createNSURLRequest;
@end

TTURLRequest *request  = [TTURLRequestrequestWithURL:kRequestURLPath delegate:self];

request.response = [[[TTURLImageResponsealloc] init]autorelease];[request send];  //异步方式去请求

#pragma mark -#pragma mark TTURLRequestDelegate//开始请求- (void)requestDidStartLoad:(TTURLRequest*)request {[_requestButtonsetTitle:@"Loading..."forState:UIControlStateNormal];}//请求完成- (void)requestDidFinishLoad:(TTURLRequest*)request {TTURLImageResponse* imageResponse = (TTURLImageResponse*)request.response;if (nil == _imageView) {_imageView = [[UIImageView alloc] initWithFrame:CGRectZero];[_scrollView addSubview:_imageView];}_imageView.image = imageResponse.image;[_imageView sizeToFit];_imageView.alpha = 0;[UIView beginAnimations:nil context:nil];[UIView setAnimationDuration:0.5];_requestButton.alpha = 0;_clearCacheButton.alpha = 0;[_scrollView setContentSize:_imageView.frame.size];_imageView.alpha = 1;[UIView commitAnimations];}//请求错误处理- (void)request:(TTURLRequest*)request didFailLoadWithError:(NSError*)error {[_requestButtonsetTitle:@"Failed to load, try again."forState:UIControlStateNormal];}