ASIHTTPRequest詳解http請(qǐng)求終結(jié)者

ASIHTTPRequestHTTP異步請(qǐng)求，隊(duì)列請(qǐng)求，GZIP壓縮，緩存，斷點(diǎn)續(xù)傳，進(jìn)度跟蹤，上傳文獻(xiàn)，HTTP認(rèn)證Objective-CBlockAPIHang住而不響應(yīng)任何顧客事件。因此，（下面會(huì)講到）-{NSURL*url=[NSURLASIHTTPRequest*request=[ASIHTTPRequestrequestWithURL:url];[requeststartSynchronous];NSError*error=[requesterror];if(!error){NSString*response=[request}}a,requestWithURLASIHTTPRequest的一種實(shí)例b,startSynchronous辦法啟動(dòng)同時(shí)訪問，c,requesterror屬性獲取錯(cuò)誤信息。d,responseStringNSString信息。-{NSURL*url=[NSURLASIHTTPRequest*request=[ASIHTTPRequestrequestWithURL:url];[requestsetDelegate:self];[request}-(void)requestFinished:(ASIHTTPRequest{//UsewhenfetchingtextNSString*responseString=[request//UsewhenfetchingbinaryNSData*responseData=[request}-(void)requestFailed:(ASIHTTPRequest{NSError*error=[request}a，與上面不同的地方是指定了一種"delegate"startAsynchronous來啟動(dòng)網(wǎng)絡(luò)請(qǐng)求。bdelegaterequestFinished，請(qǐng)求失敗時(shí)（如網(wǎng)絡(luò)問題或服務(wù)器內(nèi)部錯(cuò)誤）requestFailed。maxConcurrentOperationCount時(shí)，請(qǐng)求實(shí)例將被置為等待，直到前面最少有一種請(qǐng)求完畢并優(yōu)），maxConcurrentOperationCount設(shè)為“1”。-{if(![selfqueue])[selfsetQueue:[[[NSOperationQueuealloc]init]}NSURL*url=[NSURLASIHTTPRequest*request=[ASIHTTPRequestrequestWithURL:url];[requestsetDelegate:self];[requestsetDidFinishSelector:@selector(requestDone:)];[requestsetDidFailSelector:@selector(requestWentWrong:)];[[selfqueue]addOperation:request];//queueisan}-(void)requestDone:(ASIHTTPRequest{NSString*response=[request}-(void)requestWentWrong:(ASIHTTPRequest{NSError*error=[request}NSOperationQueueCocoa架構(gòu)的執(zhí)行任務(wù)（NSOperation）的任務(wù)隊(duì)列。我們通ASIHTTPRequest.hNSOperation的子類。也就是說它userInfobsetDidFinishSelectorsetDidFailSelector的回調(diào)辦法cASIHTTPRequestrequestFinished:與failWithProblem:辦法ASINetworkQueues,delegaterequestdeleaget。中其實(shí)并不能執(zhí)行請(qǐng)求，只有調(diào)用queuego]才會(huì)執(zhí)行；一種正在運(yùn)行中的隊(duì)列，并不需要重復(fù)調(diào)用[queuego]。默認(rèn)狀況下，隊(duì)列中的一種請(qǐng)求如果失敗，它會(huì)取消全部未完畢的請(qǐng)求。能夠設(shè)立queuesetShouldCancelAllRequestsOnFailure:NO]來修正。另一方面，不管是隊(duì)列請(qǐng)求，還是簡(jiǎn)樸的異步請(qǐng)求，全部調(diào)用[requestcancel]delegate辦法，則設(shè)立：request如果只想取消一種請(qǐng)求，能夠設(shè)立隊(duì)列：queuesetShouldCancelAllRequestsOnFailure:NO如果想明確取消全部請(qǐng)求：queuecancelAllOperationsdelegatedelegate-{[requestclearDelegatesAndCancel];[requestrelease];[super}ASIFormDataRequestFormHeader會(huì)自動(dòng)識(shí)別。ASIFormDataRequest*request=[ASIFormDataRequestrequestWithURL:url];[requestsetPostValue:@"Ben"forKey:@"first_name"];[requestsetPostValue:@"Copsey"[requestsetFile:@"/Users/ben/Desktop/ben.jpg"[requestaddData:imageDatawithFileName:@"george.jpg"andContentType:@"image/jpeg"forKey:@"photos"];ASIHTTPRequest*request=[ASIHTTPRequest[requestappendPostData:[@"Thisismydata"http://DefaultbecomesPOSTwhenyouuseappendPostData:/appendPostDataFromFile:/setPostBody:[requestrequestsetDownloadDestinationPath，能夠設(shè)立下載文獻(xiàn)用的下載目的目錄。temporaryFileDownloadPath目錄下。如果下載完畢會(huì)做下列事1downloadDestinationPath目錄中，臨時(shí)文獻(xiàn)信息：statusheader[request[[requestresponseHeaders]objectForKey:@"X-Powered-By"];[requestresponseEncoding];cookieCookieNSHTTPCookieStorage你能夠用[ASIHTTPRequestsetSessionCookies:nil];Cookies。Cookie//CreateaNSDictionary*properties=[[[NSMutableDictionaryalloc]init][propertiessetValue:[@"TestValue"encodedCookieValue][propertiessetValue:@"ASIHTTPRequestTestCookie"[propertiessetValue:@"."[propertiessetValue:[NSDatedateWithTimeIntervalSinceNow:60*60][propertiessetValue:@"/asi-http-request/tests"NSHTTPCookie*cookie=[[[NSHTTPCookiealloc]initWithProperties:properties]autorelease];//Thisurlwillreturnthevalueofthe'ASIHTTPRequestTestCookie'cookieurl=[NSURLURLWithString:@""];request=[ASIHTTPRequestrequestWithURL:url];[requestsetUseCookiePersistence:NO];[requestsetRequestCookies:[NSMutableArrayarrayWithObject:cookie]];[requeststartSynchronous];//Shouldbe:Ihave'TestValue'asthevalueofNSLog(@"%@",[request0.94[requestsetAllowResumeForFileDownloads:YES[requestsetDownloadDestinationPath:downloadPathASIHTTPRequest會(huì)自動(dòng)保存訪問過的ＵＲＬ信息，并備之后用。在下列幾個(gè)場(chǎng)景非常有用：ASIDownloadCacheGet請(qǐng)求的響應(yīng)數(shù)據(jù)進(jìn)行緩存（200請(qǐng)求[ASIHTTPRequestsetDefaultCache:[ASIDownloadCacheASIHTTPRequest*request=[ASIHTTPRequestrequestWithURL:url];[requestsetDownloadCache:[ASIDownloadCachesharedCache]];request實(shí)例中：[cachesetStoragePath:@"/Users/ben/Documents/Cached-Downloads"];[selfsetMyCache:cache];ASIHTTPRequest*request=[ASIHTTPRequestrequestWithURL:url];[requestsetDownloadCache:[selfmyCache]];默認(rèn)緩存行為，request會(huì)先判斷與否存在緩存數(shù)據(jù)。a,如果沒有再進(jìn)行網(wǎng)絡(luò)請(qǐng)求。b，如果存，request將被取消（沒有錯(cuò)誤信息）（這個(gè)在解決異常時(shí)非常有用你能夠設(shè)立緩存的數(shù)據(jù)需要保存多長(zhǎng)時(shí)間，ASIHTTPRequest提供了兩種方略：儲(chǔ)。當(dāng)下次運(yùn)行或[ASIHTTPRequestclearSession]時(shí)，緩存將失效。ASIHTTPRequest*request=[ASIHTTPRequestrequestWithURL:url[requestsetCacheStoragePolicy:ASICachePermanentlyCacheStoragePolicy];clearCachedResponsesForStoragePolicyHeader[[ASIDownloadCachesharedCache]setShouldRespectCacheControlHeaders:NO];request緩存的有效時(shí)間[requestsetSecondsToCache:60*60*24*30];30[requestdidUseCachedResponse[requestsetDownloadDestinationPath:[[ASIDownloadCachesharedCache]pathToStoreCachedResponseDataForRequest:request]];ASICacheDelegate默認(rèn)的狀況下，ASIHTTPRequesthttp//ConfigureaproxyservermanuallyNSURL*url=[NSURLURLWithString:@""];ASIHTTPRequest*request=[ASIHTTPRequestrequestWithURL:url];[requestsetProxyHost:@""];[requestsetProxyPort:3128//Alternatively,youcanuseamanually-specifiedProxyAutoConfigfile//(It'sprobablybestifyouusealocal[requestsetPACurl:[NSURLASIHTTPRequest,iOS4[requestsetShouldContinueWhenAppEntersBackground:YES[ASIHTTPRequestisNetworkInUsestatusbar[ASIHTTPRequestsetShouldUpdateNetworkActivityIndicator:NO[request