title: NSURLConnection returns data but I cannot read it
body: <p>This is another simple question who'se answer escapes me after a hour on Google...</p>
  
  <p>A user is typing something into a text field and upon this field loosing focus, I launch an NSURLConnection....</p>
  
  <pre><code>NSString *usernameTry = [sender text];
  NSLog(@"username field = %@",usernameTry);
  
  NSString *content = [@"http://www.siebenware.de/Rhythm/user/checkusername.php?username=" stringByAppendingString:usernameTry];
  content = [content stringByAddingPercentEscapesUsingEncoding:NSASCIIStringEncoding];
  
  NSURLRequest *request = [NSURLRequest requestWithURL:[NSURL URLWithString:content] cachePolicy:NSURLRequestReloadIgnoringLocalCacheData timeoutInterval:5.0];
  NSURLConnection *connection = [[NSURLConnection alloc] initWithRequest:request delegate:self];
  [connection start];
  NSLog(@"%@",content);
  </code></pre>
  
  <p>Then I wait for the response....</p>
  
  <pre><code>- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response {
  NSLog(@"Received Response");
  if ([response isKindOfClass:[NSHTTPURLResponse class]]) {
      NSHTTPURLResponse *httpResponse = (NSHTTPURLResponse *) response;
      int status = [httpResponse statusCode];
  
      if (!((status &gt;= 200) &amp;&amp; (status &lt; 300))) {
          NSLog(@"Connection failed with status %@", status);
          [UIApplication sharedApplication].networkActivityIndicatorVisible = NO;
      }
  }
  
  }
  
  - (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data {
  [resultsData appendData:data];
  NSString *resultsString = [[NSString alloc] initWithData:resultsData encoding:NSUTF8StringEncoding];
  NSLog(@"received data %@ %i",resultsString,[resultsString length]);
  
  if ([resultsString isEqualToString: @"FAIL"]){
      NSLog(@"failed to retrieve data");
  }else{    
      resultsObjects = [[resultsString componentsSeparatedByString:@":"] mutableCopy];
  
      if([resultsObjects objectAtIndex:0]==@"usernamecheck"){
          if ([resultsObjects objectAtIndex:1]==username.text) {
              if ([resultsObjects objectAtIndex:2]==@"NG"){
                  //set the check marker to bad
                  [usernameVer setImage:[UIImage imageNamed:@"redcross.png"]];
              }else{
                  //set the check market to good
                  [usernameVer setImage:[UIImage imageNamed:@"greentick.png"]];
              }
          }
  
      }
  }
  }
  
  - (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error {
  
  NSLog([NSString stringWithFormat:@"Connection failed: %@", [error description]]);
  UIAlertView *errorAlert = [[UIAlertView alloc] initWithTitle:@"Unable to retrieve data" message:[NSString stringWithFormat:@"Error code %i",[error code]] delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil];
  
  }
  </code></pre>
  
  <p>I see the response arrive in didReceiveResponse and am getting 18 bytes of data (which is correct).</p>
  
  <p>However didReceiveData says that the 'data' is null. I know I am missing something exceptionally simple, and I promise to kick myself once this is cleared up.</p>
  
  <p>Regards
  Chris H</p>