tree 7811420b6f8befc4f0cc9f94e43c1a56c6156d12
parent 17a4ae8c780596dcf622ebc05340a257e87d5f09
author Tobias Henkel <tobias.henkel@bmw.de> 1513793516 +0100
committer Tobias Henkel <tobias.henkel@bmw.de> 1513794855 +0100

Fix github caching

We do caching of the requests to github using cachecontrol which is
injected into the urllib3 session. The caching needs to be entirely
etag based as max-age based caching leads to working with stale data.

Unlike documented [1] cachecontrol doesn't priorize the etag caching
but doesn't even rerequest until max-age was elapsed.

Thus we need to add a custom caching heuristic [2] which simply drops
the cache-control header containing max-age. This way we force
cachecontrol to only rely on the etag headers.

[1] http://cachecontrol.readthedocs.io/en/latest/etags.html
[2] http://cachecontrol.readthedocs.io/en/latest/custom_heuristics.html

Change-Id: If47e1eaa942914a243fc03666b83cd896665bd71