Req: specific the Content-Type of the upload

It would be useful to specify the content-type when write to a file, especially if text/plain as browser can render without saving and opening outside.

Requires GCSFile().open() to accept, in wt or wb mode only, an optional content-type argument, which is passed to either simple upload or resumable upload (initialize only).

[martindurant]

It would be fine to add content-type and content-encoding to open() and put(). Indeed. maybe arbitrary header parameters could be passed through. Would you have time to attempt this? Is the documentation clear on how to create VCR recordings for tests?

[martindurant]

How to record new tests: https://gcsfs.readthedocs.io/en/latest/developer.html#testing-and-vcr