title: Sending a JSON via POST in NSURLRequest
body: <p>I have a problem with sending a JSON to a Server with REST API.
  This is the code i use:</p>
  
  <pre><code>NSString *jsonPostBody = [NSString stringWithFormat:@"'json' = '{\"user\":{\"username\":"
                            "\"%@\""
                            ",\"password\":"
                            "\"%@\""
                            "}}'",
                            [username stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding],
                            [password stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding]];       
  NSData *postData = [jsonPostBody dataUsingEncoding:NSUTF8StringEncoding allowLossyConversion:YES];
  NSString *apiPathParams = [NSString stringWithFormat:@"%@",
                             @"getUser"
                             ];
  
  NSURL *url = [NSURL URLWithString:[[apiPath retain] stringByAppendingString:apiPathParams]];    
  NSMutableURLRequest* request = [NSMutableURLRequest requestWithURL:url
                                                         cachePolicy:NSURLRequestReloadIgnoringLocalCacheData
                                                     timeoutInterval:180.0];
  [request setHTTPMethod:@"POST"];
  [request setHTTPBody:postData];
  NSString* postDataLengthString = [[NSString alloc] initWithFormat:@"%d", [postData length]];
  [request setValue:@"application/json" forHTTPHeaderField:@"Content-Type"];
  [request setValue:postDataLengthString forHTTPHeaderField:@"Content-Length"];
  [self internalRequest:request];
  </code></pre>
  
  <p>This is what the API would look like, if it was a html form:</p>
  
  <pre><code>&lt;form method="post" action="someAPI-URL"&gt;
  &lt;input name="json" value="{"user":...}" /&gt;
  &lt;/form&gt;
  </code></pre>
  
  <p>This is what my POST Data looks like when i add it to the request:</p>
  
  <pre><code>json={"user":{"username":"someUser","password":"somePassword"}}
  </code></pre>
  
  <p>For a reason I don't know the POST Data does not arrive at the server.
  Have i done something wrong with the formatting of the dataString?
  How exactly must i format my dataString so that it matches the String a form as shown above would deliver to the server?</p>
  
  <p>Any help would be highly appreciated.</p>
  
  <p>P.S. I would rather not use ASIHttpRequest, since i took over the project from somebody else an every other request works fine, except this post-request.
  So changing this whole bulk to an other connection framework would be very time consuming.</p>
  
  <p>Here is the internalRequest Method's sourcecode</p>
  
  <pre><code>NSURLConnection *connection = [[NSURLConnection alloc] initWithRequest:req delegate:self];
  NSMutableDictionary *di = [NSMutableDictionary dictionaryWithObject:[[NSMutableData alloc] init] forKey:@"receivedData"];   
  [di setObject:[NSString stringWithFormat:@"%i",identifier] forKey:@"identifier"];
  if (delegate == nil) 
  { 
      delegate = self;         
  }
  [di setObject:delegate forKey:@"delegate"];
  
  CFDictionaryAddValue(connectionToInfoMapping, connection, di)
  </code></pre>