SSE Support Removed: Moving to Streamable HTTP MCP-Server

We have officially removed support for Server-Sent Events (SSE) in our Streamable HTTP MCP-Server implementation.

SSE was previously used to deliver real-time updates to clients, but as our platform has evolved, we have shifted our focus to more robust and flexible streaming technologies.

What does this mean?

• SSE server URLs are now deprecated and will no longer be supported in RapidMCP.
• We recommend all users transition to our new streaming endpoints, which offer improved performance, reliability, and compatibility with a wider range of clients and use cases.

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FYI

We have officially moved our default position from SSE (Server-Sent Events) to Streamable HTTP servers. This is the new direction the MCP world is moving towards.

• No action is needed from you right now.
• We will continue to support SSE for a long period until all clients have transitioned.

If you'd like to know more or need help with the migration, feel free to ping me!

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We've added support for Streamable HTTP and also SSE. Long story short, MCP protocol has made a decision to remove SSE support but all of the client apps have needed to update to the latest protocol.

If you update, you'll need to change the RapidMCP url from /see to /stream - this will be the ideal way going forward so you're on the target protocol.

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All that said, we still support old protocol. So/sse should still work as expected.

Let me know if you need a head with this.

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tldr:

change this:

{
   "RapidMCP": {
      "url": "http://localhost:4000/mcp/xxxxx/sse",
    },
}

to this:

{
   "RapidMCP": {
      "url": "http://localhost:4000/mcp/xxxx/stream",
      "headers": {
        "api-key": "xxxx"
      }
    },
}