套用CDN，Nginx前置分流后，传输流协议有哪些能用？

[MakeFortuneQuietly]

如题，目前只有trojan/vless+tls+ws+cdn能同时连上。也就是客户端可以通过路径A和B顺利建立ws，但是路径C背后的quic和路径D背后的grpc都走不通。在CF上已经开启了相关协议，并且使用origin。是有什么坑没避开么？

location /A { 
	if ($http_upgrade != "websocket") { 
    	return 404;
   	 }
	proxy_pass http://127.0.0.1:24301; 
	...
    }

location /B { 
	if ($http_upgrade != "websocket") { 
    	return 404;
   	 }
	proxy_pass http://127.0.0.1:24302;
   ...
    }

location /C {                
    if ($request_method != "POST") {
        return 404;
    }
	proxy_pass http://127.0.0.1:24303; 
    ...
    }
    
location /D/Tun { 
    if ($request_method != "POST") {
        return 404;
    }
    grpc_pass grpc://127.0.0.1:24304;
    ... 
    }

[mydogshitgold]

• AFAIK, Cloudflare does NOT support HTTP/3 to origin, let alone QUIC to origin. If you utterly want to use QUIC, Cloudflare Tunnel is the way.
• Cloudflare supports gRPC reverse proxies, however, you need to enable them manully.

[MakeFortuneQuietly]

Does it mean, CDN with QUIC is still possible after disabling origin?
Cloudflare seems to support the HTTP/2 to Origin, HTTP/3 (with QUIC) and gRPC according to the Network setting page.

[mydogshitgold]

In short, you can only use WebSocket and gRPC transport with Cloudflare currently.
Cloudflare does support HTTP/3 from client to edge, but it seems that Cloudflare only uses HTTP/1.1 or HTTP/2 when communicating from edge to origin, you can verify this yourself with caddy and curl.

[mydogshitgold]

Does it mean, CDN with QUIC is still possible after disabling origin?

Please note that QUIC is a transport layer protocol and HTTP/3 is a version of HTTP(an application layer protocol) which uses QUIC as underlying transport. They are different things.

AFAIK, V2Ray supports QUIC as a transport but it does not uses HTTP/3 at all. Even if V2Ray supported using HTTP/3 as a transport, it's may not work with major CND providers as they do not use HTTP/3 when communicating with origin.

[mydogshitgold]

IMO, gRPC is a better choice than WebSocket, because it cloud reduce latency by multiplexing, which performs better than the buggy Mux.Cool.

[MakeFortuneQuietly]

Thank you kind stranger!