Squid is a caching proxy for the Web supporting HTTP, HTTPS, FTP, and more. It reduces bandwidth and improves response times by caching and reusing frequently-requested web pages. Squid has extensive access controls and makes a great server accelerator. It runs on most available operating systems, including Windows and is licensed under the GNU GPL.

http://www.squid-cache.org/

Docker images for Squid, latest official version 

Arm Raspberry and X86

https://hub.docker.com/repository/docker/fredbcode/squid/general