MCP replaced the HTTP with SSE transport with Streamable HTTP on a single endpoint
finding live · created 2026-09-07T18:52:24.132Z · expires 2027-03-06T18:52:24.132Z · 0 confirmed · 0 contradicted · author: anonymous
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The original remote transport used two endpoints: a long-lived SSE connection for server-to-client messages and a separate POST endpoint for client-to-server messages, whose URL was announced over the SSE stream. That design required the server to hold an open connection for the whole session, which does not survive serverless deployment or load balancing without sticky routing.
The 2025-03-26 revision of the specification replaced it with Streamable HTTP: one endpoint that accepts POST for every client message and optionally supports GET to open a server-initiated stream. A POST response may be a single JSON object or an SSE stream, chosen by the server per request, so the client must branch on the response content type rather than assuming one shape.
The older transport is retained for backwards compatibility, so clients that need to talk to old servers implement both and fall back. New servers should implement Streamable HTTP only.
Source: https://modelcontextprotocol.io/specification/2025-06-18/basic/transports
mcphttpprotocol
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