title: NSMutableURLRequest setHTTPBody: crash
body: <p>I'm trying to send some data to a PHP script online to submit online scores for my iOS application.</p>
  
  <p>The script will require account credentials formatted with the proper escape characters for a HTTP request. It's the setHTTPBody method which cashes the application:</p>
  
  <pre><code>        [text_field removeFromSuperview];
          text_field.text = @""; //Remove text so it doesn't show because the text field is still on top of the open gl view
          text_field.enabled = NO;
          NSMutableURLRequest * request=[NSMutableURLRequest requestWithURL:[NSURL URLWithString:@"secret"] cachePolicy:NSURLRequestReloadIgnoringLocalAndRemoteCacheData timeoutInterval:10.0];
          [request setHTTPMethod: @"POST"];
          [request setHTTPBody: [[NSString stringWithFormat:@"username=%@&amp;password=%@&amp;score=%i",[ogl_view-&gt;username stringByAddingPercentEscapesUsingEncoding:NSUnicodeStringEncoding],[text_field.text stringByAddingPercentEscapesUsingEncoding:NSUnicodeStringEncoding],ogl_view-&gt;score[0]] dataUsingEncoding:NSUnicodeStringEncoding]];  
          NSURLConnection * connection = [[NSURLConnection alloc] initWithRequest: request delegate:self];
          if (connection){
              received_data = [[NSMutableData data] retain];
              ogl_view-&gt;section = CURLING_PROCESS_CREDENTIALS;
          }else{
              ogl_view-&gt;section = CURLING_LOGIN_OR_REGISTER;
              UIAlertView *connection_alert = [[UIAlertView alloc] initWithTitle:@"Error" message: @"Can't connect to server" delegate:nil cancelButtonTitle:@"Close" otherButtonTitles: nil];
              [connection_alert show];
              [connection_alert release];
          }
  </code></pre>
  
  <p>I've found that it crashes at the point that the setHTTPBody method is called. Does anyone know why?</p>
  
  <p>Thank you for any answer.</p>
  
  <p>Edit: Here's the crash log:</p>
  
  <pre><code>    2010-09-02 19:02:30.291 iPhone Monkey Curling[431:207] -[DOMText stringByAddingPercentEscapesUsingEncoding:]: unrecognized selector sent to instance 0x5c97ce0
      2010-09-02 19:02:30.293 iPhone Monkey Curling[431:207] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[DOMText stringByAddingPercentEscapesUsingEncoding:]: unrecognized selector sent to instance 0x5c97ce0'
      *** Call stack at first throw:
      (
          0   CoreFoundation                      0x02531919 __exceptionPreprocess + 185
          1   libobjc.A.dylib                     0x0267f5de objc_exception_throw + 47
          2   CoreFoundation                      0x0253342b -[NSObject(NSObject) doesNotRecognizeSelector:] + 187
          3   CoreFoundation                      0x024a3116 ___forwarding___ + 966
          4   CoreFoundation                      0x024a2cd2 _CF_forwarding_prep_0 + 50
          5   iPhone Monkey Curling               0x00004338 -[PasswordFieldDelegate textFieldShouldReturn:] + 450
          6   UIKit                               0x00699358 -[UIKeyboardImpl callShouldInsertText:] + 148
          7   UIKit                               0x05f29c86 -[UIKeyboardImplAccessibility(SafeCategory) callShouldInsertText:] + 70
          8   UIKit                               0x006a0693 -[UIKeyboardImpl addInputString:fromVariantKey:] + 107
          9   UIKit                               0x006a2957 -[UIKeyboardImpl handleKeyEvent:] + 1723
          10  UIKit                               0x007c31c0 -[UIKeyboardLayoutStar sendStringAction:forKey:] + 684
          11  UIKit                               0x007c79ba -[UIKeyboardLayoutStar touchUp:] + 2556
          12  UIKit                               0x006b99a3 -[UIKeyboardLayout touchesEnded:withEvent:] + 550
          13  UIKit                               0x0058a2ff -[UIWindow _sendTouchesForEvent:] + 567
          14  UIKit                               0x0056c1ec -[UIApplication sendEvent:] + 447
          15  UIKit                               0x00570ac4 _UIApplicationHandleEvent + 7495
          16  GraphicsServices                    0x02d97afa PurpleEventCallback + 1578
          17  CoreFoundation                      0x02512dc4 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE1_PERFORM_FUNCTION__ + 52
          18  CoreFoundation                      0x02473737 __CFRunLoopDoSource1 + 215
          19  CoreFoundation                      0x024709c3 __CFRunLoopRun + 979
          20  CoreFoundation                      0x02470280 CFRunLoopRunSpecific + 208
          21  CoreFoundation                      0x024701a1 CFRunLoopRunInMode + 97
          22  GraphicsServices                    0x02d962c8 GSEventRunModal + 217
          23  GraphicsServices                    0x02d9638d GSEventRun + 115
          24  UIKit                               0x00574b58 UIApplicationMain + 1160
          25  iPhone Monkey Curling               0x00002388 main + 102
          26  iPhone Monkey Curling               0x00002319 start + 53
      )
  </code></pre>