Output is filled with warning data

Line 180 is the headers list()

$output= $this->output
->set_content_type('application/json')
->set_header("Access-Control-Allow-Origin", "*")
->set_output(json_encode($table));
$headers=headers_list();

I put that in there to prove to myself that the headers were OK, which they are.

proof that an old dog can learn new tricks