[php-src] Issue #21184: Docs suggestion: PWA .webmanifest files often served as HTML

[email protected] (skaffa)
Newsgroups php.bugs
Message-ID <[email protected]> 
Issue: https://github.com/php/php-src/issues/21184
Author: skaffa

### Description

Many modern web apps use PWA manifests (`.webmanifest`).
On common PHP setups, these are often routed through PHP and returned as HTML, silently breaking PWA installability.
Would it make sense to:

* Document `.webmanifest` as a JSON resource, or
* Recommend default MIME mappings (`application/manifest+json`), or
* Provide guidance for common servers (Apache/nginx) in the PHP docs?
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