[enhancement] Add ability to disable automatic decompression of body

[thehesiod]

In our library we'd like the ability to disable the automatic decompression of the request body as we need to compare a hash in the headers to the original body.

Right now this doesn't seem to be possible as the HTTP parser creates a DeflateBuffer which will automatically decompress the body. If guidance is given how this should be achieved I can create a PR and test case.

[fafhrd91]

let's split this into two parts

1. add extra parameter to HttpParser, so it can create HttpPayloadParser with compression=None. This should with both python parser and c-extension parser. this should be simple
2. modify client/web api. this is complicated part, because decompression could start before handler get called.

@asvetlov thoughts?

[asvetlov]

I believe @thehesiod talks about client API.
It could be done by simple flag in session.get() and family.

[thehesiod]

I just noticed that if I try a aiobotocore s3 client get_object of a key that a Content-Encoding metadata set to gzip, it's automatically decompressing the body as well, not-good...this means it returns the wrong datatype for an expected operation due to the automatic decompression. I'll link another bug report to this.

[thehesiod]

ok, created PR which resolves this

[lock]

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[new issue]: https://github.com/aio-libs/aiohttp/issues/new