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
From what I gathered, this is just Nginx defaulting to HTTP/0.9, where
headers are expected. And actually doing the right thing here.
But shouldn’t $server_protocol default to HTTP/0.9 in that case, instead
being an empty string ?