[BUG]: when APP_ROOT_PATH is set, virtual server mcp request not working, returns 404

[shixuguang]

🐞 Bug Summary

Briefly describe the issue or unexpected behavior.

when we set APP_ROOT_PATH, then mcp calls made to virtual server/mcp endpoint returns 404

🧩 Affected Component

Select the area of the project impacted:

• mcpgateway - API
• mcpgateway - UI (admin panel)
• mcpgateway.wrapper - stdio wrapper
• Federation or Transports
• CLI, Makefiles, or shell scripts
• Container setup (Docker/Podman/Compose)
• Other (explain below)

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🔁 Steps to Reproduce

1. set APP_ROOT_PATH=/our/nginx/path
2. configure mcpgateway url to https://our_host/out/nginx/path/servers/server_id/mcp
3. returns 404

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🤔 Expected Behavior

What should have happened instead?

this was working for us in RC2

📓 Logs / Error Output

Paste any relevant stack traces or logs here.
⚠️ Do not paste secrets, credentials, or tokens.

{
  "asctime": "2026-04-09T20:06:53",
  "name": "mcpgateway.services.structured_logger",
  "levelname": "WARNING",
  "message": "[http_gateway] Request completed: POST /physical_location/ocp4813-default/mcp-context-forge-sqlite-9ac3666-7l9l7xpezyk8/servers/7ce5f5ba03814433afab9d7122a96c38/mcp - 404",
  "component": "http_gateway",
  "category": null,
  "user_id": null,
  "user_email": null,
  "team_id": null,
  "duration_ms": 35.10475158691406,
  "custom_fields": null,
  "tags": null,
  "correlation_id": "75151795cbc640b290650fd458257b4d",
  "operation_type": "http_request",
  "request_method": "POST",
  "request_path": "/physical_location/ocp4813-default/mcp-context-forge-sqlite-9ac3666-7l9l7xpezyk8/servers/7ce5f5ba03814433afab9d7122a96c38/mcp",
  "response_status_code": 404,
  "user_agent": "node",
  "client_ip": "10.17.100.117",
  "metadata": {
    "event": "request_completed",
    "response_time_category": "fast"
  },
  "hostname": "mcp-context-forge-sqlite-9ac3666-7l9l7xpezyk8-75dd5dd68c-gdh7v",
  "process_id": 1,
  "timestamp": "2026-04-09T20:06:53.127173+00:00",
  "@timestamp": "2026-04-09T20:06:53.127355Z",
  "request_id": "75151795cbc640b290650fd458257b4d"
}

🧠 Environment Info

You can retrieve most of this from the /version endpoint.

Key	Value
Version or commit	main@9ac3666
Runtime	Python 3.12, Gunicorn
Platform / OS	RHEL 9
Container	openshift

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🧩 Additional Context (optional)

Add any configuration details, flags, or related issues.