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copied!<p>Where's JSON in your example? You have nothing looking like it in the example. You're doing a few things wrong in setting up the request, check Sulthan answer.</p> <p>My advice is to use a library that handles such minor formal details - like encoding and headers - for you.</p> <p>With <a href="https://github.com/AFNetworking/AFNetworking" rel="nofollow"><code>AFNetworking</code></a> you could write something like.</p> <pre><code>AFHTTPClient *httpClient = [[AFHTTPClient alloc] initWithBaseURL:[NSURL URLWithString:@"http://whatever.com/"]]; [httpClient registerHTTPOperationClass:[AFHTTPRequestOperation class]]; [httpClient setParameterEncoding:AFFormURLParameterEncoding] NSDictionary * params = @{ @"j_username": nombre, @"j_password": pass }; NSMutableURLRequest *request = [httpClient requestWithMethod:@"POST" path:@"relative/path/to/resource" parameters:params]; AFHTTPRequestOperation *operation = [[AFHTTPRequestOperation alloc] initWithRequest:request]; [operation setCompletionBlockWithSuccess:^(AFHTTPRequestOperation *operation, id responseObject) { NSLog(@"Response: %@", [[NSString alloc] initWithData:responseObject encoding:NSUTF8StringEncoding]); } failure:^(AFHTTPRequestOperation *operation, NSError *error) { NSLog(@"Error: %@", error); }]; [httpClient enqueueHTTPRequestOperation:operation]; </code></pre> <p>(example based on <a href="http://samwize.com/2012/10/25/simple-get-post-afnetworking/" rel="nofollow">http://samwize.com/2012/10/25/simple-get-post-afnetworking/</a>)</p> <p>While in terms on LOC in may look not so great, consider that:</p> <ul> <li><code>httpClient</code> is initialized just once and you can reuse it for subsequent requests, centralizing the configuration</li> <li>parameters gets automatically encoded in the desired format and if you have to change the encoding in the future you just have to change <code>AFFormURLParameterEncoding</code> to something else.</li> <li>you get a nice block-based API instead of relying on the cumbersome <code>NSURLConnectionDelegate</code> methods</li> </ul>

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