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Why does drupal_session_start() fail after a user clears the cache and logs back in?

I’m writing a document management module which has come pretty far and is almost ready for a final review and release, but I’ve found a really strange authentication issue that is requiring a gross work around.

Several actions in my module are handled via AJAX. I need to authenticate my user when I run the AJAX protocol. I also need to get the Drupal core functionality so I’m using the following code.

// Bootstrap Drupal. define('DRUPAL_ROOT', dirname(dirname(dirname(dirname(dirname(__FILE__)))))); require_once( DRUPAL_ROOT . '/includes/bootstrap.inc'); drupal_bootstrap(DRUPAL_BOOTSTRAP_FULL);  // Validate the user. _drupal_session_read($_POST['sid']); drupal_session_start(); if (!user_access('manage documents')) {   die('Access denied'); }

$_POST['sid'] contains the value from session_id() or from $user->sid. They should be the same thing, but if I clear my cache, log back in, go to the page, and run any AJAX action, I get a 403 error on the first request, every time. My ugly work-around is to send a "checkin" action that just triggers the 403 error, since that is returned only once.

Can anyone explain to me why this code would behave this way?

This article was republished from its original source.
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Why does drupal_session_start() fail after a user clears the cache and logs back in?

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