iphone - 如何发送带有压缩内容的 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，所以看看如何告诉服务器内容被压缩。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，比如添加一些标头，告诉 JSON 数据被压缩到 gzip 中。

我知道，标准方法是告诉服务器客户端接受编码，但您需要先发出带有接受编码标头的 GET 请求。就我而言，我想发布已经编码的数据。

Answer 1

例如，包括一个 Obj-C gzip 包装器，NSData+GZip并使用它来编码您的NSURLRequest. 还要记住Content-Encoding相应地设置，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，例如以下并设置适当的 Header 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];