URL rewriting without a redirect

If you want to rewrite URLs in Apache without a redirect(using internal forwarding) use the P flag at the end as below

http://localhost/foo/1 to http://moo.com/foo/1

RewriteRule /foo/(.*)   http://moo.com/foo/$1 [P]

Config file syntax check

If you want to make sure that your apache config file syntax is in tact without restarting apache, run this command

apache2ctl -t

Apache mod_proxy in Ubuntu

Follow the following steps to set up a reverse proxy using Apache in Ubuntu:

1. Install reverse_proxy module

sudo apt-get install libapache2-mod-proxy-html

2. Install libxml if it is not already installed.

apt-get install libxml2-dev

3. Load the modules in apache2.conf file

LoadModule  proxy_module         /usr/lib/apache2/modules/mod_proxy.so
LoadModule  proxy_http_module    /usr/lib/apache2/modules/mod_proxy_http.so
LoadModule  headers_module       /usr/lib/apache2/modules/mod_headers.so
LoadModule  deflate_module       /usr/lib/apache2/modules/mod_deflate.so
LoadFile    /usr/lib/libxml2.so

4. Say you want to forward all requests starting with /foo to http://moo.com then add the following to your apache2.conf file

ProxyPass /foo/  http://moo.com/

5. Bounce Apache and you are good to go.