Change Details

After the switch from `httplib2` to `requests`, proxy support was 'lost'. It was never really very good in `core`, as it differed from `compat` and required messing with `httplib2` internals (see https://gerrit.wikimedia.org/r/#/c/137293/) `config2` still includes `proxy`, but it is now unimplemented. It is relatively easy to re-add proxy support using requests, and doing it nicely would include a lot of the code. However `requests` supports env variables, such as: $ export HTTP_PROXY="http://10.10.1.10:3128" $ export HTTPS_PROXY="http://10.10.1.10:1080" IMO that is 'good enough', and we should decommission `config2.proxy`.