Add option to manually send out large files

[SteffenDE]

I'm working on a project where I need aiohttp to send out large files (and I do not want to use an extra server). For static files there is the add_static method, but what if somebody wants to send out a large file manually from a request handler using os.sendfile (if available)?

I've written some scripts demonstrating what I achieved to do:
https://gist.github.com/SteffenDE/f1d19190cdaecb93e4a6

This works, but I wondered if there was a way to add something like this to aiohttp, e.g. as web.FileResponse?

[asvetlov]

aiohttp doesn't support it yet.
See also #773

[amirouche]

any update on this?

[asvetlov]

Fixed by #901

[lock]

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