Content length is 0 by default in aiohttp.web.Response

[julien-duponchelle]

Long story short

If you create an empty web response you will have a content length of 0 instead of None.

Expected behaviour

Content length should be None.

Actual behaviour

Content length is 0

Steps to reproduce

import aiohttp.web
r = aiohttp.web.Response()
r.content_length
>>> 0

Your environment

aiohttp 2.0.7 on macos

[julien-duponchelle]

I'm not sure of me. But it seem sometimes this can create trouble with chunked encoding. That's why previously I opened this PR:
#1933

[fafhrd91]

this is intended behavior, because you supply response body. by default it is empty.

[julien-duponchelle]

Thanks

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