Read output stream after reading response headers

[fonsp]

Some request implementations in other languages work slightly differently: they first return a Response containing HTTP status and headers, after which the user initiates reading.

fetch in JS

requests in Python3

What this enables is:

• you can pipe the IO into a JSON/CSV/JPEG/MP3/etc parser, depending on the Content-Type header of the response.
• you can choose not to read the response body depending on the headers (I'm thinking of cache headers)

I also think this is a "feature" of HTTP: HTTP status and headers are received first, describing how to remaining body should be read.

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Is this behaviour already possible with Downloads.request? I have the impression that right now, request will first write the full body content into the given output::IO, and then it returns the Response object containing headers and such.

Thanks for the awesome package!