HTTP/2: removed http2_idle_timeout and http2_max_requests. Instead, keepalive_timeout and keepalive_requests are now used. This is expected to simplify HTTP/2 code and usage. This also matches directives used by upstream module for all protocols. In case of default settings, this effectively changes maximum number of requests per connection from 1000 to 100. This looks acceptable, especially given that HTTP/2 code now properly supports lingering close. Further, this changes default keepalive timeout in HTTP/2 from 300 seconds to 75 seconds. This also looks acceptable, and larger than PING interval used by Firefox (network.http.spdy.ping-threshold defaults to 58s), the only browser to use PINGs.

scgi_param  REQUEST_METHOD     $request_method;
scgi_param  REQUEST_URI        $request_uri;
scgi_param  QUERY_STRING       $query_string;
scgi_param  CONTENT_TYPE       $content_type;

scgi_param  DOCUMENT_URI       $document_uri;
scgi_param  DOCUMENT_ROOT      $document_root;
scgi_param  SCGI               1;
scgi_param  SERVER_PROTOCOL    $server_protocol;
scgi_param  REQUEST_SCHEME     $scheme;
scgi_param  HTTPS              $https if_not_empty;

scgi_param  REMOTE_ADDR        $remote_addr;
scgi_param  REMOTE_PORT        $remote_port;
scgi_param  SERVER_PORT        $server_port;
scgi_param  SERVER_NAME        $server_name;