VSCode cannot connect? Failing with `405 Method Not Allowed`

[SinOverCos]

Describe the bug

I posted this on VSCode as well: microsoft/vscode#246753

Connecting to an MCP server via VSCode gets me:

2025-04-16 14:13:05.469 [info] 405 status sending message to http://localhost:19193/sse, will attempt to fall back to legacy SSE
2025-04-16 14:13:05.470 [warning] Failed to parse message: "/messages/?session_id=7f7ad4150c504c3bb9b9741f1930403f"
2025-04-16 14:13:10.437 [info] Waiting for server to respond to `initialize` request...
2025-04-16 14:13:15.436 [info] Waiting for server to respond to `initialize` request...
2025-04-16 14:13:20.437 [info] Waiting for server to respond to `initialize` request...
2025-04-16 14:13:25.438 [info] Waiting for server to respond to `initialize` request...

• on the VSCode side

and

2025-04-16T18:10:59.750322099Z - stdout: INFO:     127.0.0.1:52222 - "POST /sse HTTP/1.1" 405 Method Not Allowed

• on the MCP server side

To Reproduce

Expected behavior

Screenshots

Desktop (please complete the following information):

• OS: Ubuntu 24.04

Smartphone (please complete the following information):

Additional context
MCP python-sdk version 1.6.0

[connor4312]

This was a bug in VS Code which'll be fixed in tomorrow's Insiders

[gokul427]

same issue i'm facing