enable_compression doesn't work with FileResponse in sendfile mode #2942
Description
Long story short
response.enable_compression doesn't work on Heroku.
Expected behaviour
enable_compression on a response should work on Heroku.
Actual behaviour
While this worked locally just fine, Heroku didn't like it when I enabled compression on a FileResponse:
Apr 17 11:58:19 my-app-staging heroku/router: http_error="Bad chunk" at=error code=H17 desc="Poorly formatted HTTP response" method=GET path="/" host=my-app-staging.herokuapp.com request_id=0bc47133-af19-4999-bc0f-179054b7388a fwd="xx.xx.xx.xx" dyno=web.1 connect=0ms service=19ms status=503 bytes= protocol=https
Apr 17 11:58:19 my-app-staging heroku/router: http_error="Bad chunk" at=error code=H17 desc="Poorly formatted HTTP response" method=GET path="/" host=my-app-staging.herokuapp.com request_id=9c1b4583-61d5-4867-bf1a-75de194cf71f fwd="xx.xx.xx.xx" dyno=web.1 connect=0ms service=5ms status=503 bytes= protocol=https
Apr 17 11:58:23 my-app-staging heroku/router: http_error="Bad chunk" at=error code=H17 desc="Poorly formatted HTTP response" method=GET path="/" host=my-app-staging.herokuapp.com request_id=a2f80aee-0ba0-4117-9139-123a79fd2f1c fwd="xx.xx.xx.xx" dyno=web.1 connect=0ms service=3ms status=503 bytes= protocol=https
Steps to reproduce
resp = web.FileResponse('./dist/index.html', headers={'Cache-Control': 'no-cache'})
resp.enable_compression()
return resp
Your environment
aiohttp==2.3.6
Using aiohttp directly on Heroku (no gunicorn/etc).