Basic MCP SSE Server Requests/Responds

How To
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I’m at my wit’s end. I’ve been trying for a week to get an MCP SSE server up and running. It doesn’t matter if I build a native MCP server in PHP, use the Python SDK, or use a Node.js library. I’m truly desperate. I’ve already asked on Reddit, StackOverflow, ChatGPT Pro, and Cursor, but none of them could help. It always gets stuck at the same point. The server establishes a connection, then the status stays yellow and nothing else happens. A reload only gives a log message “from Handling ListOfferings action,” there’s no request sent to the server, nothing happens.

I’m really hoping someone will have mercy and provide me with the exact request/response flow with sample data. Starting from entering the SSE URL, what does Cursor send, what does it expect, which URLs are triggered internally that I don’t know about, what format, what events, and so on. That would help me a great deal to replicate this somehow, because I’m truly stuck and something seems to be missing. It looks like Cursor is expecting something. I haven’t tried STDIO yet, and it wouldn’t help in my scenario.

Thank you to anyone who can give me even the smallest hint or instructions that actually work.

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After one week of try and error here a working example Server in Node.JS
GitHub - b3nelof0n/node-mcp-server feel free to use it for learning purpose or…

1 Like
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Thank you @b3nelof0n for sharing this! Did not find any of this information in the Cursor MCP docs or the MCP it self.

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cursor team has just updated docs, perhaps revisit again. i also recommend anthropics example implementations of mcp servers like memory. they work well and not too complex

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@b3nelof0n
I don’t know if you resolved your issue, but I broke through with mine if you want to see