如何使用gziped内容发送HTTP POST请求？

Question

我正在开发iPhone应用程序并手动构建POST请求.目前,需要在发送之前压缩JSON数据,以便了解如何告知服务器内容是否已压缩.将内容类型标头设置为gzip可能是不可接受的,因为服务器需要JSON数据.我正在寻找透明的解决方案,就像添加一些标题,告诉JSON数据压缩成gzip.

我知道,标准的方法是告诉服务器客户端接受编码,但是你需要首先使用accept编码头发出GET请求.就我而言,我想发布已编码的数据.

Answer 1

例如NSData+GZip,包括一个Obj-C gzip包装器,并用它来编码你的身体NSURLRequest.还要记得相应地设置Content-Encoding,以便网络服务器知道如何处理您的请求.

NSData *requestBodyData = [yourData gzippedData];
NSString *postLength = [NSString stringWithFormat:@"%d", requestBodyData.length];
[request setValue:postLength forHTTPHeaderField:@"Content-Length"];
[request setValue:@"gzip" forHTTPHeaderField:@"Content-Encoding"];
[request setHTTPBody:requestBodyData];

Answer 2

实现一些通用方法（如下所示）并设置适当的标头可能会对您有所帮助。

// constructing connection request for url with no local and remote cache data and timeout seconds
NSMutableURLRequest *request =[NSMutableURLRequest requestWithURL:[NSURL URLWithString:callingWebAddress]];// cachePolicy:NSURLRequestReloadIgnoringLocalAndRemoteCacheData timeoutInterval:timoutseconds];
[request setHTTPMethod:@"POST"];

NSMutableDictionary *headerDictionary = [NSMutableDictionary dictionary];
[headerDictionary setObject:@"application/json, text/javascript" forKey:@"Accept"];
[headerDictionary setObject:@"application/json" forKey:@"Content-Type"];

//Edit as @centurion suggested
[headerDictionary setObject:@"Content-Encoding" forKey:@"gzip"];
[headerDictionary setObject:[NSString stringWithFormat:@"POST /Json/%@ HTTP/1.1",method] forKey:@"Request"];
[request setAllHTTPHeaderFields:headerDictionary];

// allocation mem for body data
self.bodyData = [NSMutableData data];

[self appendPostString:[parameter JSONFragment]];

// set post body to request
[request setHTTPBody:bodyData];

NSLog(@"sending data %@",[[[NSString alloc] initWithData:bodyData encoding:NSUTF8StringEncoding]autorelease]);

// create new connection for the request
// schedule this connection to respond to the current run loop with common loop mode.
NSURLConnection *aConnection = [[NSURLConnection alloc] initWithRequest:request delegate:self];
//[aConnection scheduleInRunLoop:[NSRunLoop currentRunLoop] forMode:NSRunLoopCommonModes];
self.requestConnenction = aConnection;
[aConnection release];