Create request object only after the first byte was received.

Previously, we always created an object and logged 400 (Bad Request)
in access log if a client closed connection without sending any data.
Such a connection was counted as "reading".

Since it's common for modern browsers to behave like this, it's no
longer considered an error if a client closes connection without
sending any data, and such a connection will be counted as "waiting".

Now, we do not log 400 (Bad Request) and keep memory footprint as
small as possible.

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