Re-enable HTTP compression

The original commit (9865ed89) disabling
it claimed it fixed OCI downloads. This no longer seems to be a problem.

This has also exposed new bugs as some servers will send
gzip compressed data when the client does not send Accept-Encoding.
If we leave this enabled that issue goes away.

(cherry picked from commit cda4967a9e2977caccafb6f72eceab1159db113f)