Support httpgzip debugging
Created by: umpox
Temporarily add additional logs to httpgzip
by running from this branch: https://github.com/sourcegraph/httpgzip/compare/master...sourcegraph:debug
e.g. navigating to https://sourcegraph.com/.assets/scripts/app.f7aecd61b920c157cc06.bundle.js?HTTPGZIP_DEBUG=1 will output additional logs