Ask for help: Could I use the xhttp behind the fallback of xtls-rprx-vision

[aabbccgg]

Hi community,

I had a xray using xtls vision in the frontend. With vless httpupgrade, nginx server (for my websites) and dns server in the backend using the xtls fallback.

I had noticed that you recommend users to migrate the protocol from httpupgrade to xhttp in the release note. Then I had tried to update my settings for xhttp, but failed.

Thus, I wonder if I can use the xhttp behind the fallback of xtls-rprx-vision. If so, could you please leave a configuration model for me in this situation?

Sincerely,
@aabbccgg

[TanZhiwen2001]

Yes and no. XHTTP is used to hide Xray’s fingerprint with nginx or Caddy. However, if you use Vision with fallback, the fingerprint still appears as Xray.

[aabbccgg]

Thank you for your answer.

Yes, u r right, I do know this setting will expose a xray's fingerprint to the mitm. But the problem is I had tried to use the xray vision as frontend then fallback to xhttp as backend, however I can't establish the connection. BTW, I had tried to set a ip and port for xhttp listening, it didn't work yet.

I attached my server log and server config as follows, please help me with this problem. Thank you.

log

2025/07/11 03:31:45.250213 [Info] transport/internet/tcp: listening TCP on 0.0.0.0:443
2025/07/11 03:31:45.250218 [Info] transport/internet/splithttp: listening UNIX domain socket for XHTTP on /dev/shm/xhttp_client_upload.sock,0666
2025/07/11 03:31:45.250222 [Warning] core: Xray 25.6.8 started
2025/07/11 03:31:50.440307 [Info] [3873615402] proxy/vless/inbound: firstLen = 24
2025/07/11 03:31:50.440336 [Info] [3873615402] proxy/vless/inbound: fallback starts > proxy/vless/encoding: invalid request version
2025/07/11 03:31:50.440340 [Info] [3873615402] proxy/vless/inbound: realName = a.com
2025/07/11 03:31:50.440344 [Info] [3873615402] proxy/vless/inbound: realAlpn = h2

config

"inbounds": [
        {
            "port": 443,
            "protocol": "vless",
            "settings": {
                "clients": [
                    {
                        "id": "id1",
                        "flow": "xtls-rprx-vision",
                        "level": 0,
                        "email": "[email protected]"
                    },
                    {
                        "id": "id2",
                        "flow": "xtls-rprx-vision",
                        "level": 0,
                        "email": "[email protected]"
                    }
                ],
                "decryption": "none",
                "fallbacks": [
                    {
                        "name": "a.com",
                        "path": "/path",
                        "dest": "/dev/shm/xhttp_client_upload.sock",
                        "xver": 0
                    },
                    {
                        "name": "adh.a.com",
                        "dest": "8081",
                        "xver": 2
                    },
                    {
                        "name": "a.com",
                        "dest": "8080",
                        "xver": 2
                    },
                    {
                        "dest": "80"
                    }
                ]
            },
            "streamSettings": {
                "network": "tcp",
                "security": "tls",
                "tlsSettings": {
                    "minVersion": "1.2",
                    "certificates": [
                        {
                            "certificateFile": "/home/xraySSL/a.com.crt",
                            "keyFile": "/home/xraySSL/a.com.key"
                        }
                    ]
                }
            }
        },
        {
            "listen": "/dev/shm/xhttp_client_upload.sock,0666",
            "protocol": "vless",
            "settings": {
                "clients": [
                    {
                        "id": "id1",
                        "level": 0,
                        "email": "[email protected]"
                    },
                    {
                        "id": "id2",
                        "level": 0,
                        "email": "[email protected]"
                    }
                ],
                "decryption": "none"
            },
            "streamSettings": {
                "network": "xhttp",
                "xhttpSettings": {
                    "path": "/path"
                }
            }
        }
    ]