The list of loaded modules can be obtained easily if you have SSH access to the server. We will use the httpd command with the -M option. -M will output a list of loaded Static and Shared Modules.

# httpd -M
[email protected] [~]# httpd -M
Loaded Modules:
 core_module (static)
 so_module (static)
 http_module (static)
 mpm_event_module (shared)
 systemd_module (shared)
 lsapi_module (shared)
 cgid_module (shared)
 access_compat_module (shared)
 actions_module (shared)
 alias_module (shared)
 auth_basic_module (shared)
 authn_core_module (shared)
 authn_dbm_module (shared)
 authn_file_module (shared)
 authn_socache_module (shared)
 authz_core_module (shared)
 authz_groupfile_module (shared)
 authz_host_module (shared)
 authz_user_module (shared)
 autoindex_module (shared)
 dbd_module (shared)
 deflate_module (shared)
 dir_module (shared)
 expires_module (shared)
 filter_module (shared)
 headers_module (shared)
 include_module (shared)
 log_config_module (shared)
 logio_module (shared)
 mime_module (shared)
 negotiation_module (shared)
 proxy_module (shared)
 proxy_http_module (shared)
 proxy_wstunnel_module (shared)
 reqtimeout_module (shared)
 rewrite_module (shared)
 setenvif_module (shared)
 slotmem_shm_module (shared)
 socache_dbm_module (shared)
 socache_shmcb_module (shared)
 socache_redis_module (shared)
 status_module (shared)
 suexec_module (shared)
 unique_id_module (shared)
 unixd_module (shared)
 userdir_module (shared)
 bwlimited_module (shared)
 ssl_module (shared)
 http2_module (shared)
 security2_module (shared)
[email protected] [~]#

To check if a specific module is loaded, add the grep command. For example to check the if the ssl module is present, use:

# httpd -M | grep ssl
[[email protected] ~]# httpd -M | grep ssl
 ssl_module (static)
[[email protected] ~]#

If you don’t have SSH access to the web server, you can use the apache_get_modules PHP function to get the loaded modules. This method will work only if the PHP is installed as an Apache Module (mod_php). (it will not work with PHP-FPM for example) Create a PHP file – e.g. apachemodules.php – with the following content and access it in your browser.

<?php
// prints Apache Modules - works only if the PHP is installed as an Apache Module
echo 'The Apache Modules found on the server are:</br>';

print_r(apache_get_modules());

?>

Resources:
apache_get_modules
httpd server