PHP curl how to retrieve headers when using Proxy. CURLOPT_HEADERFUNCTION?

Question

I'm connecting to a site using a proxy like this:

$curl = curl_init(); curl_setopt($curl, CURLOPT_PROXY, $proxy); curl_setopt($curl, CURLOPT_URL, $url); curl_setopt($curl, CURLOPT_POST, 1); curl_setopt($curl, CURLOPT_POSTFIELDS, $data); curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1); curl_setopt($curl, CURLOPT_HEADER, TRUE); $result = curl_exec ($curl);

Problem is that CURLOPT_HEADER is returning the headers from the proxy connection whereas I need the headers from the actual request to the URL. I believe the solution involves using CURLOPT_HEADERFUNCTION but I don't understand how to use it.

I tried this (taken from elsewhere on SO):

curl_setopt($curl, CURLOPT_HEADERFUNCTION, "HandleHeaderLine");

using function:

function HandleHeaderLine($curl, $header_line ) { echo "<br>YEAH: ".$header_line; // or do whatever return strlen($header_line); }

But it seems I can only return the number of bytes. I'm unsure how to get the actual value. In my situation I just want the Location Header.

Thank you.

Is curl returning only the proxy header, or all headers? Because if it's the first, it can be something with your proxy configs that may be suppressing such info (I don't think how, since browser needs them), and if second, you have just to process the string headers it returns (see it here). — alanmm
– alanmm, Commented Sep 18, 2015 at 14:09
Curl is definitely retrieving All the headers. I could see it when I enable verbose. The problem is that CURLOPT_HEADER only returns the proxy headers so I cannot use it to retrieve the Location header — user2029890
– user2029890, Commented Sep 18, 2015 at 14:14

laketuna · Accepted Answer · 2018-08-02 19:51:48Z

The anonymous callback for CURLOPT_HEADERFUNCTION will need access to the variable in which you want to store the header information. There are a few different approaches, but here some examples:

Using use:

$headers = []; ... function HandleHeaderLine($curl, $header_line) use (&$headers) { ... if ($isHeaderIWant) { $header[] = 'some info'; } return strlen($header_line); }

Using class property:

private $headers = []; ... function HandleHeaderLine($curl, $header_line) { ... if ($isHeaderIWant) { $this->header[] = 'some info'; } return strlen($header_line); }

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