Support for compression during upload (and compressed storage)

[tpoindessous]

Hi

GCS and gsutil support compression before upload : files are compressed and uploaded. They are stored compressed and then GCS knows if it can be served compressed or uncompressed.

https://cloud.google.com/storage/docs/transcoding

It would be nice if this plugin can support that.

[leonstafford]

Great idea! Sounds like it should be possible. I'm going to be a while longer on core plugin improvements, but happy to accept a pull request for this.

[tpoindessous]

Ok, I will look at it, if I can.

Beware that we should check that librairie don't add "no-transform" header , like gsutil does GoogleCloudPlatform/gsutil#480

thanks !