CProxy-Cache is an extension to CProxy. It adds a hybrid memory and filesytem HTTP cache to CProxy with ESI support.
go get github.com/pquerna/cachecontrol/cacheobject
go build -buildmode=plugin
This will create a '.so' or '.dll' file depending on your OS. Add this file to the 'ext' directory with the CProxy executable and add the filename to the extension list in 'cproxy.json.'