Server-Sent Events (SSE) Connection

⚠️ Deprecated - SSE as a standalone transport has been deprecated in favor of Streamable HTTP.

What Happened to SSE?

According to the official MCP specification, SSE as a standalone transport was deprecated in protocol version 2024-11-05 and replaced by Streamable HTTP.

Current MCP Transport Options

The MCP specification now defines only two standard transport mechanisms:

1. stdio - Communication over standard in and standard out
2. Streamable HTTP - HTTP-based communication with optional SSE support

What This Means

• SSE functionality is still available - but as part of Streamable HTTP, not as a standalone transport
• Streamable HTTP can use SSE - for server-to-client streaming when needed
• No standalone SSE servers - SSE is now integrated into the HTTP transport

Migration Path

If you were planning to use SSE, consider:

• Streamable HTTP - The modern replacement that includes SSE capabilities
• Local Process (stdio) - For local server connections
• WebSocket - For full-duplex real-time communication (custom transport)

Next Steps

• Streamable HTTP - The modern HTTP transport with SSE capabilities
• Local Process (stdio) - Local server connections with many examples
• Example MCP Servers - Available server examples