call  with the following parameters provided as GET or POST:
    type=html - [gif, svg, html, css, js, json, help]
Optional parameters:    delay=1000 - delay response for 1000ms
    type=1000 - delay response for 1000ms
    status=404 - http response code
    message=Not+Found - http response message
    content-type=text/html - overwrite default mime types
    relocate=http%3A%2F%2Fexample.com%2F - relocate to given URL (overwrites code=302, message=Moved+Temporarily)
    charset=UTF-8 - have non-binary output encoded to specific encoding (e.g. ISO-8859-1 or UTF-16BE
                    see http://php.net/manual/en/function.mb-list-encodings.php#example-2615 for more)