config Feishu MCP server for open code mmet an Error message：SSE error: Non-200 status code (404) #18724

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1. iwaner

   added

   bugSomething isn't workingSomething isn't working

   on Mar 23, 2026
2. github-actions

   assigned

   rekram1-node

   on Mar 23, 2026
3. github-actions

   added

   coreAnything pertaining to core functionality of the application (opencode server stuff)Anything pertaining to core functionality of the application (opencode server stuff)

   on Mar 23, 2026
4. github-actions commented on Mar 23, 2026

   

   github-actionsBot

   on Mar 23, 2026 – with GitHub Actions

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   This issue might be a duplicate of an existing issue. Please check:

   • Unauthenticated streamable HTTP MCP servers are reported as SSE errors instead of missing auth #16247: Same "SSE error: Non-200 status code" symptom when connecting to a remote MCP server that uses streamable HTTP instead of SSE
5. dl-alexandre commented on Mar 23, 2026

   

   dl-alexandre

   on Mar 23, 2026

   Contributor

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   Same issue with Tidewave MCP server (local development)

   I'm experiencing the exact same problem with lidewave https://github.com/tidewave-ai/tidewave_phoenix- an MCP server for Phoenix/LiveView development.
   Environment:

   • OpenCode version: latest (installed via npm)
   • MCP Server: tidewave 0.5.6 (local SSE server)
   • Protocol:
     2025-03-26
     -URL: http://localhost:4003/tidewave/mcp

   Error:

   SSE error: Unable to connect. Is the computer able to access the url?

   HTTP response: 400 Bad Request

   Response body: "Unsupported protocol version. Server supports 2025-03-26
   or later"

   Workaround:
   Downgraded to tidewave 0.1.10 (uses older protocol 2024-11-05) which works fine.

   Root cause:

   The server requires protocol version 2025-03-26 but OpenCode's MCP client appears to be sending an older version. According to the MCP spec, servers can require specific protocol versions.

   +1 to getting 2025-03-26 support added to OpenCode!
6. thdxr

   removed

   bugSomething isn't workingSomething isn't working

   coreAnything pertaining to core functionality of the application (opencode server stuff)Anything pertaining to core functionality of the application (opencode server stuff)

   on May 3, 2026
7. github-actions commented on Jul 3, 2026

   

   github-actionsBot

   on Jul 3, 2026 – with GitHub Actions

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   To stay organized issues are automatically closed after 60 days of no activity. If the issue is still relevant please open a new one.
8. github-actions

   closed this as not plannedon Jul 3, 2026