Apache reverse proxy with ProxyPass how to

First install and enable Apache reverse proxy module (mod_proxy) using apt-get (ubuntu, debian, etc):

~> sudo apt-get install libapache2-mod-proxy-html
~> a2enmod proxy_http

Edit your virtual host:

	<VirtualHost *:80>
	...
	ProxyPass /api http://127.0.0.1:28017
	ProxyPassReverse /api http://127.0.0.1:28017
	<Directory "FOLDER">
	...
	</Directory>
	</VirtualHost>

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Configure the module to allow connections from your network, edit /etc/apache2/mods-enabled/proxy.conf

	<IfModule mod_proxy.c>
	ProxyRequests Off
	<Proxy *>
	AddDefaultCharset off
	Order deny,allow
	Deny from all
	Allow from 192.168.8.0/24
	</Proxy>
	ProxyVia On
	</IfModule>

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Restart apache and you are ready to go!.

Possible errors you could get

If you get this error in /var/log/apache2/error.log :

[error] [client 192.168.56.1] client denied by server configuration: proxy:http://127.0.0.1:28017/folder/

You have to check the "Allow" directive in /etc/apache2/mods-enabled/proxy.conf  remember to allow your network!!!.

If you get this error in /var/log/apache2/error.log :

[warn] proxy: No protocol handler was valid for the URL /api/. If you are using a DSO version of mod_proxy, make sure the proxy submodules are included in the configuration using LoadModule.

you should remember to enable the module:

~> a2enmod proxy_http