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http – Apache 2.4 + PHP-FPM and Authorization headers

Posted by: admin April 23, 2020 Leave a comment


Apache 2.4’s mod_proxy does not seem to be passing the Authorization headers to PHP-FPM. Is there any way to fix this?

Long version:
I am running a server with Apache 2.4 and PHP-FPM. I am using APC for both opcode caching and user caching. As recommended by the Internet, I am using Apache 2.4’s mod_proxy_fcgi to proxy the requests to FPM, like this:

ProxyPassMatch ^/(.*\.php)$ fcgi://$1

The setup works fine, except one thing: APC’s bundled apc.php, used to monitor the status of APC does not allow me to log in (required for looking at user cache entries). When I click “User cache entries” to see the user cache, it asks me to log in, clicking on the login button displays the usual HTTP login form, but entering the correct login and password yields no success. This function is working perfectly when running with mod_php instead of mod_proxy + php-fpm.

After some googling I found that other people had the same issue and figured out that it was because Apache was not passing the Authorization HTTP headers to the external FastCgi process. Unfortunately I only found a fix for mod_fastcgi, which looked like this:

FastCgiExternalServer /usr/lib/cgi-bin/php5-fcgi -host -pass-header Authorization

Is there an equivalent setting or some workaround which would also work with mod_proxy_fcgi?

How to&Answers:

Various Apache modules will strip the Authorization header, usually for “security reasons”. They all have different obscure settings you can tweak to overrule this behaviour, but you’ll need to determine exactly which module is to blame.

You can work around this issue by passing the header directly to PHP via the env:

SetEnvIf Authorization "(.*)" HTTP_AUTHORIZATION=$1

See also Zend Server Windows – Authorization header is not passed to PHP script


This took me a long time to crack, since it’s not documented under mod_proxy or mod_proxy_fcgi.

Add the following directive to your apache conf or .htaccess:

CGIPassAuth on

See here for details.


I didn’t find any similar settings with mod_proxy_fcgi BUT it just works for me by default. It asks for user authorization (.htaccess as usual) and the php gets it, and works like with mod_php or fastcgi and pass-header. I don’t know if I was helpful…

it only works on teszt.com/ when using the DirectoryIndex… If i pass the php file name (even if the index.php!) it just doesn’t work, don’t pass the auth to the php. This is a blocker for me, but I don’t want to downgrade to apache 2.2 (and mod_fastgi) so I migrate to nginx (on this machine too).