Apache redirect to another port

You should leave out the domain http://example.com in ProxyPass and ProxyPassReverse and leave it as /. Additionally, you need to leave the / at the end of example/ to where it is redirecting. Also, I had some trouble with http://example.com vs. http://www.example.com - only the www worked until I made the ServerName www.example.com, and the ServerAlias example.com. Give the following a go.

<VirtualHost *:80> 
  ProxyPreserveHost On
  ProxyRequests Off
  ServerName www.example.com
  ServerAlias example.com
  ProxyPass / http://localhost:8080/example/
  ProxyPassReverse / http://localhost:8080/example/
</VirtualHost> 

After you make these changes, add the needed modules and restart apache

sudo a2enmod proxy && sudo a2enmod proxy_http && sudo service apache2 restart

I solved this issue with the following code:

LoadModule proxy_module modules/mod_proxy.so
LoadModule proxy_http_module modules/mod_proxy_http.so
<VirtualHost *:80>
ProxyPreserveHost On
ProxyRequests Off
ServerName myhost.example
ServerAlias www.myhost.example
ProxyPass / http://localhost:8080/
ProxyPassReverse / http://localhost:8080/
</VirtualHost>

I also used:

a2enmod proxy_http

I wanted to do exactly this so I could access Jenkins from the root domain.

I found I had to disable the default site to get this to work. Here's exactly what I did.

$ sudo vi /etc/apache2/sites-available/jenkins

And insert this into file:

<VirtualHost *:80>
  ProxyPreserveHost On
  ProxyRequests Off
  ServerName mydomain.example
  ServerAlias mydomain
  ProxyPass / http://localhost:8080/
  ProxyPassReverse / http://localhost:8080/
  <Proxy *>
        Order deny,allow
        Allow from all
  </Proxy>
</VirtualHost>

Next you need to enable/disable the appropriate sites:

$ sudo a2ensite jenkins
$ sudo a2dissite default
$ sudo service apache2 reload