Streamable HTTP error:

Bug Reports
1

Where does the bug appear (feature/product)?

Somewhere else…

Describe the Bug

after updating the vscode i am getting
Streamable HTTP error: Failed to open SSE stream: Not Found Streamable HTTP error: Failed to open SSE stream: Not Found

mcp setting
“cnc”: {
“autoApprove”: ,
“disabled”: false,
“timeout”: 60,
“type”: “streamableHttp”,
“url”: “http://localhost:3000/mcp”
}
i used this code
GitHub - modelcontextprotocol/typescript-sdk: The official TypeScript SDK for Model Context Protocol servers and clients

Steps to Reproduce

vscode Version 1.106 cline extension

Operating System

Windows 10/11

Current Cursor Version (Menu → About Cursor → Copy)

i am using vscode with cline extension

For AI issues: which model did you use?

chat gpt 5

Does this stop you from using Cursor

No - Cursor works, but with this issue

2

Hey, thanks for the report. I noticed you mentioned you’re using VSCode version 1.106 with the Cline extension, not Cursor IDE. This forum is specifically for Cursor support, so you’ll probably get better help by posting in:

  • VSCode support channels for VSCode-specific issues
  • Cline’s GitHub repository for Cline extension support

That said, the “Failed to open SSE stream: Not Found” error usually means:

Could you check that your MCP server is actually running and accessible at that URL?

If you are actually using Cursor IDE (not VSCode), please let me know and share your Cursor version from Cursor → Help → About Cursor, and I can help troubleshoot further.

3

Thanks for your reply. Can you please help with this? I need this immediately for my project.
I used the quick start code, which is provided in the link below link GitHub - modelcontextprotocol/typescript-sdk: The official TypeScript SDK for Model Context Protocol servers and clients
. Before updating the VS Code, it worked. After updating the VS Code, it is not working.
if you have any reference code, please share

4

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