Install Squid Proxy on Ubuntu

Install Squid

When asked to continue press Y

Configure Squid

The default configuration file for squid is located under /etc/squid3/squid.conf or /etc/squid/squid.conf.

For http proxy you may need to change below options

http_port: Default is 3128

http_access deny all: You may want this to change to http_access allow all for probably testing purpose but real life scenario would be to allow just 1 IP address of your webserver

Remember to restart squid after making any changes to the configuration file