htaccess redirect for directory listing to virtual host on a local MAMP stack

Question

For my local dev environment, I have just upgraded from MAMP to MAMP Pro so that I can easily create virtual hosts without getting too involved with configuration files. Server names will be formatted as: foldername.localhost

For my site's directory I want to create an htaccess rule to redirect from http://localhost/foldername to http://foldername.localhost, where "foldername" is a wildcard.

Is this possible?

Answer 1

Yes, this is possible:

RewriteEngine On
RewriteCond %{HTTP_HOST} =localhost
RewriteCond %{DOCUMENT_ROOT}/$1 -d
RewriteRule ^([^/]+)(.*) http://$1.localhost$2 [R=301,L]

This will redirect http://localhost/foldername/path/to/file to http://foldername.localhost/path/to/file (where /path/to/file is optional).

There are two parenthesised sub patterns for the "foldername" ($1) and "URL path" ($2).

The second RewriteCond directive checks to see whether the first part of the URL is a valid directory.