MCP error: reading: context canceled

[baruchiro]

📜 Description

I'm trying to connect the MCP server from the settings, I'm running on another machine and connected to my Self-Hosted instance via Tailscale network.

👟 Reproduction steps

1. Take the MCP URL from Postiz
2. Replace https with http
3. Replace the host name with {tailscaleIP}:5000
4. Connect to the MCP (by MCP Inspector for example)
5. Check the container logs

👍 Expected behavior

MCP should list the available tools

👎 Actual Behavior with Screenshots

Log error:

[0] 3|backend  | MCP transport started
[1] {"level":"error","ts":1751176200.77511,"logger":"http.handlers.reverse_proxy","msg":"aborting with incomplete response","upstream":"localhost:3000","duration":0.067429828,"request":{"remote_ip":"172.18.0.1","remote_port":"42114","client_ip":"172.18.0.1","proto":"HTTP/1.1","method":"GET","host":"TAILSACLE:5000","uri":"/mcp/MY_TOKEN/sse","headers":{"User-Agent":["node"],"Cache-Control":["no-cache"],"Accept-Encoding":["gzip, deflate"],"Sec-Fetch-Mode":["cors"],"Pragma":["no-cache"],"X-Forwarded-Proto":["http"],"X-Forwarded-Host":["TAILSCALE:5000"],"Accept-Language":["*"],"X-Forwarded-For":["172.18.0.1"],"Accept":["text/event-stream"]}},"error":"reading: context canceled"}
[0] 3|backend  | MCP transport closed

💻 Operating system

Linux

🤖 Node Version

v20.18.1

📃 Provide any additional context for the Bug.

Self Hosted

👀 Have you spent some time to check if this bug has been raised before?

• I checked and didn't find similar issue

Are you willing to submit PR?

Yes I am willing to submit a PR!