How to conditionally redirect to a custom scheme URL in Apache?

Question

I have an Apache configured like this:

RewriteEngine on
RewriteCond %{REQUEST_URI} ^/launchApp$
RewriteCond %{HTTP_USER_AGENT} Android
# Here I want to redirect to an URL with a custom scheme

The RewriteRule does not work form custom schemes (in my case mobile://... )

The PHP module is loaded in my Apache, then I thought about a solution like redirecting to a local URL serving a file like:

<?php
  header("Location: mobile://...");
?>

But I don't like the idea of achieving this by forwading the HTTP request to a local one, and it causes problems with the rest of my configuration.

How to conditionally redirect to a custom scheme URL in Apache?

Answer 1

I found a satisfying solution, which uses a shell script and allows not to proxy the request, by referring directly to a filesystem path:

I've created the file /var/www/cgi-bin/redirectToMobile.sh :

#!/bin/sh -f

echo "Status: 302 Found"
echo "Location: mobile://..."
echo ""

And then the following Apache conf:

RewriteCond %{REQUEST_URI} ^/launchApp$
RewriteCond %{HTTP_USER_AGENT} Android
RewriteRule ^.*$ /var/www/cgi-bin/redirectToMobile.sh [L]

ScriptAlias /cgi-bin/ /var/www/cgi-bin/

<Directory "/var/www/cgi-bin">
        AddHandler cgi-script .sh
        AllowOverride None
        Options +ExecCGI -MultiViews +SymLinksIfOwnerMatch
        Order allow,deny
        Allow from all
</Directory>