GET /websocket/ HTTP/1.1
Connection: upgrade
Upgrade: websocket
Sec-Websocket-Key: abcde
Sec-Websocket-Version: 13


--MARK--
hello world 1

--MARK--
hello world 2

--MARK--
hello world 3

--MARK--
hello world 4

--MARK--
hello world 5

--MARK--
hello world 6

--MARK--
hello world 7

--MARK--
hello world 8

--MARK--
hello world 9

--MARK--
hello world 10

--MARK--