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curl : How to set PHPSESSID in the request headers of a call, how to solve waiting and getting no response

December 17th, 2011 by kmak

I have been trying to use curl in PHP to post some data in some page of mine that requires login and thus a session to be present.
So i had to send the session along with the curl request. The problem was that the script seemed to be waiting for a response.

What happened actually was that my target script was waiting for the session to become available.
As is stated in session_write_close():

“session data is locked to prevent concurrent writes only one script may operate on a session at any time”

So my target script was waiting for the session to become writable while the current script (that made the post ) couldn’t complete because it was waiting the response of the target (cruel things the deadlocks). The solution is to call session_write_close() and free the session before you make the call curl_exec()

That’s it. Take a look at the following code. Take care.

Cheers.

<?php
    session_start();
     
    ...
    ...

    $ch = curl_init();
    if(!$ch){
        die('Failed to init curl ...');
    }

    curl_setopt($ch, CURLOPT_URL,            "https://example.org/subdir/something.php" );
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1 );
    curl_setopt($ch, CURLOPT_POST,           1 );
    curl_setopt($ch, CURLOPT_POSTFIELDS,     $raw_data );
    curl_setopt($ch, CURLOPT_HTTPHEADER,     array('Content-Type: text/xml')); //remove this line if you want submit text/html
   
    $strCookie = 'PHPSESSID=' . session_id() . '; path=/';
    curl_setopt( $ch, CURLOPT_COOKIE, $strCookie ); //We set our session in the headers of the request!

    session_write_close(); //kmak - this is what makes the session transmission possible ... otherwise we will wait and wait ...
    $result=curl_exec ($ch);
    if(!$result)
    {
        die("Failed in curl_exec with error:".curl_error($ch));
    }
    curl_close($ch);

Posted in Uncategorized | 1 Comment »

One Response

  1. Jorge Says:

    Fucking thanks!

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