Codeigniter 3.1.8 JSON Post fails

According to my host: I can confirm that file_get_contents and allow_url_fopen are enabled.
Then I tried your suggestion.

Code:

public function authorize(){
  if($this->input->is_ajax_request()) {
      echo "This is an Ajax request\n";
      $json = json_decode($this->input->raw_input_stream);
      var_dump($json);//NULL
      var_dump(json_decode(trim(file_get_contents('php://input')), true));//NULL
  }
}

I am also using the headers you suggested, see screen shot.
Any other ideas?

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