Why Xray server keep returning "failed to read request version > EOF" when using xhttp with CDN?

[youngzyl]

同一个服务器配置，不经过CDN可以正常连接，经过CDN就会出现failed to read request version > EOF无法连接，Caddy日志如下:
Dec 06 01:50:00 linux.g caddy[0987]: {"level":"error","ts":1100000000.8000000,"logger":"http.handlers.reverse_proxy","msg":"aborting with incomplete response","upstream":"localhost:5999","duration":0.000599076,"request":{"remote_ip":"172.69.1.2","remote_port":"44584","client_ip":"172.69.1.2","proto":"HTTP/2.0","method":"GET","host":"cloudflare.exameple.com","uri":"/default/uuid-uuid?","headers":{"Cf-Visitor":["{\"scheme\":\"https\"}"],"Accept-Encoding":["gzip, br"],"Cf-Ipcountry":["CN"],"User-Agent":["Go-http-client/2.0"],"X-Forwarded-Host":["cloudflare.example.com"],"Cf-Ray":["*-LHR"],"X-Forwarded-Proto":["https"],"Cdn-Loop":["cloudflare; loops=1"],"X-Forwarded-For":["172.69.1.2"],"Cf-Connecting-Ip":["218.1.0.0"]},"tls":{"resumed":false,"version":772,"cipher_suite":4865,"proto":"h2","server_name":"cloudflare.example.com"}},"error":"reading: context canceled"}

Structure

with CDN:
local --> Cloudflare CDN --> Caddy --> localhost:5999

without CDN:
local --> Caddy --> localhost:5999

Server config examp:

"inbounds": [ { "listen": "127.0.0.1", //只监听本机，避免本机外的机器探测到下面端口。 "port": 5999, //VLESS+SplitHTTP 监听端口 "protocol": "vless", "settings": { "clients": [ { "id": "uuiduui" } ], "decryption": "none" }, "streamSettings": { "network": "xhttp", "xhttpSettings": { "path": "/default" } }, "sniffing": { "enabled": true, "destOverride": [ "http", "tls", "quic" ] } } ]

Caddy config:

cloudflare.example.com { reverse_proxy /default/* localhost:5999 { transport http { versions 1.1 h2c 3 } } reverse_proxy localhost:55244 tls { dns cloudflare {env.CLOUDFLARE_API_TOKEN} } } direct.example.com { reverse_proxy /default/* localhost:5999 { transport http { versions 1.1 h2c 3 } } reverse_proxy localhost:55244 tls { dns cloudflare {env.CLOUDFLARE_API_TOKEN} } }

local config(v2rayng)