cachecontrol
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Support Cache-Control: immutable
There is a draft extension added by facebook called Cache-Control: immutable. If a response is served as immutable then that means it will never ever change no matter what. It seems like it would be useful to support this.
Ideally if a response has been marked immutable we can just skip any sort of Etag or freshness handling and just blindly serve the response.
More information here: https://bitsup.blogspot.com/2016/05/cache-control-immutable.html
It may be more justified if the corresponding feature is also implemented in httplib2/httplib2.