No HTTP version in request

[Matthieu Tourne]

I just found an interesting behavior in Nginx while looking at a reqeust
that was causing an error in my code.

For a request with no HTTP/xx version, Nginx will return no HTTP response
headers.

>From what I gathered, this is just Nginx defaulting to HTTP/0.9, where no
headers are expected. And actually doing the right thing here.

But shouldn't $server_protocol default to HTTP/0.9 in that case, instead of
being an empty string ?
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