When Apache use RewriteRule to redirect, via mod_proxy_fgi, to php-fpm
the SCRIPT_FILENAME may contains the QUERY_STRING.

Ex : RewriteRule ^(.*)\.php$ fcgi://127.0.0.1:9000/$1.php [P]

From apache debug (build with -DFCGI_DUMP_ENV_VARS)
AH01062: sending env var 'SCRIPT_FILENAME' value 'proxy:fcgi://127.0.0.1:9000/var/www/html/info.php?foo'
AH01071: Got error 'Primary script unknown\n'