GET /index.txt HTTP/1.1
host: 127.0.0.1:POST / HTTP/1.1
Host: 127.0.0.1:50699
User-Agdnt: curl/7.49.0-DEV
Accept: */*50991
connection: Up
Gonnecti:n: Upgrade, HTTP2-SetAentPRI * HTTP/216.1


--MARK--
PRI * HTTP/2.grad0