title: NSMutableData cannot be read
body: <pre><code> NSMutableData *body = [NSMutableData data];
  
  [body appendData:[self addFormData:@"username" withString:@"tom"]];
  
   NSLog(@"-----the body is %@----", body);
  </code></pre>
  
  <p>But the NSLog shows &lt;0d345621 67543687 d123ab023 ........etc></p>
  
  <p>I thought it should shows "username"="tom"   all those hex stuffs i mean no one will able to understand it.</p>