Troubleshooting SSE error: Invalid content type in Remote MCP Server

Sebastian Heyneman · 2025-07-30 18:44:58.393716+00

Hey! :wave: Getting "SSE error: Invalid content type" with my Remote MCP server even though I'm using standard HTTP endpoints (not SSE). • :white_check_mark: GET / works • :white_check_mark: GET /tools/list works • :white_check_mark: POST /tools/call works But Dust keeps trying SSE connection instead of HTTP. Any ideas? :thinking_face: Building Attio/Linear/Slite integrations. Thanks! :pray:

Sebastian Heyneman

Hey! 👋 Getting "SSE error: Invalid content type" with my Remote MCP server even though I'm using standard HTTP endpoints (not SSE).

✅ GET / works
✅ GET /tools/list works
✅ POST /tools/call works

But Dust keeps trying SSE connection instead of HTTP. Any ideas? 🤔 Building Attio/Linear/Slite integrations. Thanks! 🙏