Fix webSiteRootURL if Apache Alias directive is used

[manu0401]

When Apache Alias directive is used to map AVideo installation on a given URL prefix, webSiteRootURL should be derived from the CONTEXT_PREFIX environment variable

superseeds
#9884
#9883

[DanielnetoDotCom]

Analyzing this, $_SERVER['CONTEXT_PREFIX'] is only used in IIS with FastCGI. AVideo is only tested on Apache running on Ubuntu and is not designed for IIS, so it may not work properly on it. The proposed change is unnecessary since $_SERVER['CONTEXT_PREFIX'] is not relevant for Apache or Nginx, which are the supported environments.

[manu0401]

On Fri, Feb 14, 2025 at 05:13:53PM -0800, Daniel Neto wrote: Analyzing this, `$_SERVER['CONTEXT_PREFIX']` is only used in IIS with FastCGI.

I came to this patch because AVideo was broken on Apache-2.4.62 with mod_php 8.3.13, when using the Alias directive. The underlying OS is NetBSD, but I am quite certain the behavior is not OS-dependent.

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-- Emmanuel Dreyfus ***@***.***

[manu0401]

CONTEXT_PREFIX is set in Apache's httpd/server/util_script.c from ap_context_prefix(), a function that can be found in httpd/server/core.c

This is a recent addition, it is not yet fully documented, but it is not specific to any particular setup or OS.