Fallback from Trojan-TCP-TLS not possible

[houmie]

I was reading this excellent documentation how to create a fallback chain.

The xray config is below. As you can see all traffic that is not matching a path is being forwarded to port 5004.

"inbounds": [
    {
      "port": 443,
      "protocol": "vless",
      "settings": {
        "clients": [
          {
            "id": "UUID",
            "flow": "xtls-rprx-vision"
          }
        ],
        "decryption": "none",
        "fallbacks": [
          {
            "dest": 5004,
            "xver": 1
          },
          {
            "path": "/vmessws",
            "dest": 5000,
            "xver": 1
          },
          {
            "path": "/vlessws",
            "dest": 5001,
            "xver": 1
          }
        ]
      },
...

So all remaining traffic including Trojan will be forwarded to 5004, and if the protocol or password is wrong, then it should fall back to 5005 (defined in Caddy) But this fallback doesn't work. This is how Trojan is defined in Xray config:

{
      "listen": "127.0.0.1",
      "port": 5004,
      "protocol": "trojan",
      "settings": {
        "clients": [
          {
            "password": "006k1xxx",
            "level": 0
          }
        ],
        "fallbacks": [
          {
            "dest": 5005
          }
        ]
      },
      "streamSettings": {
        "network": "tcp",
        "security": "none",
        "tcpSettings": {
          "acceptProxyProtocol": true
        }
      }
    }

Caddy.json:
Port 5005 forwards to the local website as concealment. But This doesn't get reached.

"apps": {
    "http": {
      "servers": {
        "srv0": {
          "listen": [
            "127.0.0.1:5005"
          ],
          "listener_wrappers": [
            {
              "wrapper": "proxy_protocol"
            }
          ],
          "routes": [
            {
              "handle": [
                {
                  "handler": "vars",
                  "root": "/srv/http/default"
                },
                {
                  "handler": "file_server"
                }
              ]
            }
          ],
          "logs": {},
          "protocols": [
            "h2", "h1", "h2c"
          ]
        },
        "srv1": {
          "listen": [
            ":80"
          ],
          "routes": [
            {
              "handle": [
                {
                  "handler": "static_response",
                  "headers": {
                    "Location": [
                      "https://{http.request.host}{http.request.uri}"
                    ]
                  },
                  "status_code": 301
                }
              ]
            }
          ]
        }
      }
    },
...

The log says:

Jun 13 15:30:34 new-domain xray[67009]: 2023/06/13 15:30:34 [Info] [2601203125] proxy/vless/inbound: firstLen = 307
Jun 13 15:30:34 new-domain xray[67009]: 2023/06/13 15:30:34 [Info] [2601203125] proxy/vless/inbound: fallback starts > proxy/vless/encoding: invalid request version
Jun 13 15:30:34 new-domain xray[67009]: 2023/06/13 15:30:34 [Info] [2601203125] proxy/vless/inbound: realName = domain.com
Jun 13 15:30:34 new-domain xray[67009]: 2023/06/13 15:30:34 [Info] [2601203125] proxy/vless/inbound: realAlpn = h2
Jun 13 15:30:34 new-domain xray[67009]: 2023/06/13 15:30:34 [Info] [2161559542] proxy/trojan: firstLen = 307
Jun 13 15:30:34 new-domain xray[67009]: 2023/06/13 15:30:34 [Info] [2161559542] proxy/trojan: fallback starts > proxy/trojan: not trojan protocol
Jun 13 15:30:34 new-domain xray[67009]: 2023/06/13 15:30:34 140.228.56.133:30418 rejected  proxy/trojan: not trojan protocol
Jun 13 15:30:35 new-domain xray[67009]: 2023/06/13 15:30:35 [Info] [2601203125] app/proxyman/inbound: connection ends > proxy/vless/inbound: fallback ends > context canceled

Any suggestions please?
Many Thanks

[chika0801]

https://github.com/chika0801/Xray-examples/tree/255cde93c195c0826e72d94e3279a991abe00bb8/VLESS-TCP-TLS%2BVMess-Websocket-TLS%2BTrojan-TCP-TLS

It has been a while since I used this all-in-one combination format. This is an example I have used before. Let's see if it can help you.

[chika0801]

I have forgotten the details and principles of it myself, so I would need to try it again. Alternatively, I can provide you with a complete server configuration, and if I have time, I can help you test the configuration.