Description of problem:
mod_file_cache Is not available in httpd on RHEL 9.

I am aware of the RHEL 6 change in which that module, and a few others, were no longer supported [0]. If I had to guess, it would be that the module was dropped because it was labeled as experimental.

However, as was indicated in httpd-2.2:

> As of Apache HTTP server version 2.2 mod_cache and mod_file_cache are no longer
> marked experimental and are considered suitable for production use. These caching
> architectures provide a powerful means to accelerate HTTP handling, both as an
> origin webserver and as a proxy.

I would very much like to take advantage of this powerful means to accelerate my HTTP handling. I see that mod_cache has been enabled, what is blocking mod_file_cache?

Version-Release number of selected component (if applicable):
> [root@certs2 httpd]# rpm -q httpd
> httpd-2.4.53-7.el9_1.1.x86_64
> 
> [root@certs2 httpd]# cat /etc/redhat-release 
> Red Hat Enterprise Linux release 9.1 (Plow)

How reproducible:
Always

Steps to Reproduce:
1. Add
> LoadModule file_cache_module modules/mod_file_cache.so
Into an httpd config file, restart the service

Actual results:
> httpd: Syntax error on line 61 of /etc/httpd/conf/httpd.conf: Syntax error on line
> 1 of /etc/httpd/conf.modules.d/1337-file_cache.conf: Cannot load
> modules/mod_file_cache.so into server: /etc/httpd/modules/mod_file_cache.so:
> cannot open shared object file: No such file or directory

Additionally, I verified that the file_cache module is not in /usr/lib64/httpd/modules or anywhere else in the package.

Expected results:
mod_file_cache is loaded and serves content cached using the MMapFile directive.

Additional info:

[0] https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/6/html/migration_planning_guide/sect-migration_guide-networking-apache#doc-wrapper
[1] https://httpd.apache.org/docs/2.2/caching.html