How do I log the raw HTTP headers with a PHP script? - php

Question

I'm using a cURL script to send POST data through a proxy to a script and I want to see what raw HTTP headers the cURL script is sending. List of things I've tried:
echo curl_getinfo($ch, CURLINFO_HEADER_OUT) gives no output.
file_get_contents('php://input') gets some HTTP headers but not all.
print_r($_SERVER) also gets some HTTP headers but not all (I know this because there should be a X-Forwarded-For header and there isn't)
Printing all superglobals ($_POST, $_GET, $_REQUEST, $_FILES etc) still doesn't show the raw HTTP headers.
http_get_request_headers(), apache_request_headers(), $http_response_header, $HTTP_RAW_POST_DATA aren't outputting everything.
Help?

Answer 1

Turn on CURLOPT_HEADER, not CURLINFO_HEADER_OUT, then split on \r\n\r\n (which is where the header ends) with a maximum split count of 2 :
<?php
$ch = curl_init('http://www.yahoo.com/');
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_HEADER, true);
$result = curl_exec($ch);
if ($result !== false) {
$split_result = split("\r\n\r\n", $result, 2);
$header = $split_result[0];
$body = $split_result[1];
/** Process here **/
} else {
/** Error handling here **/
}

Answer 2

You need to also set the CURLINFO_HEADER_OUT option:
CURLINFO_HEADER_OUT
TRUE to track the
handle's request string.
Available
since PHP 5.1.3. The CURLINFO_ prefix
is intentional.
http://www.php.net/manual/en/function.curl-setopt.php
The following works:
<?php
$ch = curl_init('http://www.google.com');
curl_setopt($ch, CURLINFO_HEADER_OUT, true);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
$result = curl_exec($ch);
echo curl_getinfo($ch, CURLINFO_HEADER_OUT);

Answer 3

If you running as a module on Apache then apache_request_headers() does what you need.
For just about any other architecture you'll only be able to pick out the stuff which is recorded in $_SERVER or you'll need to find some way to record the information using the web server config.