Modifying HTTP headers using .htaccess file

Apache allows you to customize HTTP response headers using the .htaccess file. On ruachost.com, this is useful for improving security, controlling caching, and adding custom metadata to responses.

Why Modify HTTP Headers?

Security: Add headers like X-Frame-Options or Content-Security-Policy.
Caching: Control how browsers store and reuse content.
Debugging: Insert custom headers for testing.
Compliance: Ensure headers meet regulatory requirements.

Enabling Header Control

The Apache configuration on ruachost.com servers includes the mod_headers module. This allows you to add, edit, or remove headers directly in .htaccess.

Adding a Header

Use the Header set or Header append directives:

<IfModule mod_headers.c>
    Header set X-Powered-By "Ruachost"
    Header append Cache-Control "public"
</IfModule>

Header set → creates or replaces a header.
Header append → adds to an existing header value.

Editing a Header

Use the Header edit directive with regular expressions:

<IfModule mod_headers.c>
    Header set Animal monkey
    Header append Animal camel
    Header edit Animal "camel" "llama"
</IfModule>

Resulting header:

Animal: monkey, llama

???? Use Header always edit if you need to modify headers generated by applications (e.g., WordPress, Drupal).

Removing a Header

To completely remove a header:

<IfModule mod_headers.c>
    Header unset Server
</IfModule>