title: API key must be passed as the API-Key header in every request
body: <p>I want to pass API-Key in the header in every request.</p>
  
  <pre><code> NSMutableURLRequest* request = [[NSMutableURLRequest alloc] initWithURL:[NSURL URLWithString:url]];
  NSLog(@"%@",request );
  [request setHTTPMethod: @"POST"];
  
  [request addValue:@"4eaa90d7175e98732543994eaa90d717" forHTTPHeaderField:@"API-Key"] ;
  
  request = [NSURLRequest requestWithURL:[NSURL URLWithString:url] cachePolicy:
             NSURLRequestUseProtocolCachePolicy timeoutInterval:100];
  
  NSLog(@"%@",url);
  NSLog(@"%@",[request allHTTPHeaderFields]);
  </code></pre>
  
  <p>The allHTTPHeaderFields is null. am i missing something?</p>