ServerHttpProtocol: automate Response object creation

[telendt]

In the current design of ServerHttpProtocol user needs to create Response object himself in handle_request and set up a lot of stuff himself - like setting closing = True if message.version == (1, 0), remember to call write_eof() after calling send_headers() if the message.method == 'HEAD', setting keep_alive on ServerHttpProtocol instance if responsonse.keep_alive() returns True, and so on... These are really tedious tasks that could be solved by ServerHttpProtocol implementation.

My suggestion is to make handle_request method abstract, and pass a specially prepared response object via additional argument when calling it. When request handler coroutine terminates the response object could be inspected (to set keep-alive). AFAIK NodeJS solves it in a similar way.

I'd like to help you with some code, but I'm still quite fresh to asyncio (I think I still don't fully get the differences between transport and protocol).

Best regards,
Tomasz

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