golang-github-pquerna-cachecontrol-dev 0.0~git20171018.0dec1b3-2 (amd64 binary) in ubuntu lunar

 cachecontrol implements RFC 7234 Hypertext Transfer Protocol (HTTP/1.1):
 Caching. It does this by parsing the Cache-Control and other headers,
 providing information about requests and responses -- but cachecontrol does
 not implement an actual cache backend, just the control plane to make
 decisions about if a particular response is cachable.