[websocket mode] alpn in client-hello make it's v2ray

[liudongmiao]

type	alpn
go-https (net/http)	h2, http/1.1
v2ray-core	http/1.1
go-websocket (github.com/gorilla/websocket)	N/A

Referer: https://github.com/v2fly/v2ray-core/commit/8e791e92bc1898e11904bf54462635aed864cd04#diff-98874970fe9e833c1469702de67b4a0d1c731059ad04a00a349093f52f141f31R48

And for web browsers:

scheme	alpn
https	h2, http/1.1
wss	http/1.1

Please note, websocket over http2 is not supported. IMO, v2ray-core should send h2, http/1.1 like go-https (net/http), however, this requires server (like nginx) turn off http2.

[liudongmiao]

JA3 fingerprint: https://engineering.salesforce.com/tls-fingerprinting-with-ja3-and-ja3s-247362855967

[klzgrad]

FYI: WebSocket over H2 is supported after Chrome 91. https://chromestatus.com/feature/6251293127475200

[liudongmiao]

FYI: WebSocket over H2 is supported after Chrome 91. https://chromestatus.com/feature/6251293127475200

@klzgrad I have chedked it before, however there is no way to turn on. And from my case, browser always send http/1.1 for wss.

[klzgrad]

https://bugs.chromium.org/p/chromium/issues/detail?id=801564#c48

It's always enabled

[liudongmiao]

@klzgrad Just use chrome with a wss://.... then use wireshark to dump the packets.

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