Tests that WebSocket handshake information is passed to Web Inspector.
log: requestMethod: GET
log: requestHeaders
log: Accept-Encoding: ***
log: Accept-Language: en-us,en
log: Cache-Control: no-cache
log: Connection: Upgrade
log: Host: localhost:8880
log: Origin: http://127.0.0.1:8000
log: Pragma: no-cache
log: Sec-WebSocket-Extensions: permessage-deflate; client_max_window_bits
log: Sec-WebSocket-Key: ***
log: Sec-WebSocket-Version: 13
log: Upgrade: websocket
log: User-Agent: ***
log: requestHeadersText (first line): GET ws://localhost:8880/duplicated-headers HTTP/1.1
log: statusCode: 101
log: statusText: Switching Protocols
log: responseHeaders
log: Connection: Upgrade
log: Sec-WebSocket-Accept: ***
log: Upgrade: websocket
log: foo: FUGA
log: foo: bar, baz
log: foo: hoge
log: xxx: yyy
log: responseHeadersText (first line): HTTP/1.1 101 Switching Protocols