Pyramid, partial and resumable downloads, HTTP Accept Ranges

[Mikko Ohtamaa]

Hi,

What would be an easy way to support partial downloads / resumes with Pyramid? Namely HTTP Accept Ranges come to my mind, but there could be others.

- Serving files directly from FS using FileResponse

- Using gunicorn as a web server

https://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.5

Br,

Mikko

[Theron Luhn]

Easiest way is to not do it :)  I try to offload downloads/uploads to a service like S3.  Let somebody else do the heavy lifting.  If authentication is needed, I’ll generate a presigned URL in Pyramid and redirect.

AFAIA, Accept-Ranges is the only real HTTP solution for resumable/multipart downloads.

If you’re using nginx in front of gunicorn (which you should be), you can have nginx cache the response and handle Range for you.  https://www.nginx.com/blog/smart-efficient-byte-range-caching-nginx/  You could also skip Pyramid altogether and serve file directly with nginx, using the auth_request module if you need auth.  https://nginx.org/en/docs/http/ngx_http_auth_request_module.html 

If none of that is feasible, rolling your own FileResponse that handles Range shouldn’t be too difficult, although personally that’d be my very last option.

— Theron

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[Jonathan Vanasco]

^ ditto