title: AFNetworking getting json value. URL doesn't work
body: <p>Im using AFNetworking to get JSON values from my iOS application i have tested my code to this link <strong><a href="http://gdata.youtube.com/feeds/api/standardfeeds/most_popular?v=2&amp;alt=json" rel="noreferrer">http://gdata.youtube.com/feeds/api/standardfeeds/most_popular?v=2&amp;alt=json</a></strong> then my code works fine. but when i use <strong><a href="http://www.fr20.wearedesigners.net/WADMac/tourism/fetchGuideListAndroid.php" rel="noreferrer">http://www.fr20.wearedesigners.net/WADMac/tourism/fetchGuideListAndroid.php</a></strong> this link to retrieve data im getting following Error please find below the code i used.please help me to retrieve data from my URL</p>
  
  <pre><code>-(void) retriveData
  {
  
       AFHTTPRequestOperationManager *manager = [AFHTTPRequestOperationManager manager];
  [manager.requestSerializer setValue:@"text/html" forHTTPHeaderField:@"Content-type"];
  [manager GET:@"http://www.fr20.wearedesigners.net/WADMac/tourism/fetchGuideListAndroid.php" parameters:nil success:^(AFHTTPRequestOperation *operation, id responseObject) {
      NSLog(@"JSON: %@", responseObject);
  } failure:^(AFHTTPRequestOperation *operation, NSError *error) {
      NSLog(@"Error: %@", error);
  }];
  
  }
  </code></pre>
  
  <p>Error log</p>
  
  <pre><code>  2014-07-19 18:36:01.107 WADTourisum[3000:60b] Reachability Flag Status: -R ------- networkStatusForFlags
  2014-07-19 18:36:01.768 WADTourisum[3000:60b] Error: Error Domain=com.alamofire.error.serialization.response Code=-1016 "Request failed: unacceptable content-type: text/html" UserInfo=0xa05c4e0 {NSErrorFailingURLKey=http://www.fr20.wearedesigners.net/WADMac/tourism/fetchGuideListAndroid.php, com.alamofire.serialization.response.error.response=&lt;NSHTTPURLResponse: 0x8d8ba40&gt; { URL: http://www.fr20.wearedesigners.net/WADMac/tourism/fetchGuideListAndroid.php } { status code: 200, headers {
      Connection = "Keep-Alive";
      "Content-Type" = "text/html";
      Date = "Sat, 19 Jul 2014 13:05:32 GMT";
      "Keep-Alive" = "timeout=5, max=100";
      Server = "Apache/2.2.19 (Unix) mod_ssl/2.2.19 OpenSSL/0.9.8e-fips-rhel5 DAV/2 mod_auth_passthrough/2.1 mod_bwlimited/1.4 FrontPage/5.0.2.2635";
      "Transfer-Encoding" = Identity;
      "X-Powered-By" = "PHP/5.2.17";
  } }, NSLocalizedDescription=Request failed: unacceptable content-type: text/html}
  </code></pre>