MCP Protocol Drops HTTP+SSE Transport: What Developers Must Know Now

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The Model Context Protocol (MCP) has officially deprecated its HTTP+SSE two-endpoint transport, introduced in November 2024, as of March 26, 2025, with removal possible in a future revision. Developers must now choose between two supported transports: stdio for local, single-client setups, and Streamable HTTP for networked or multi-client deployments. A common pitfall with stdio servers is writing non-MCP output to stdout, which corrupts the JSON-RPC message channel; all logging must instead go to stderr. In Streamable HTTP, every JSON-RPC request is a separate POST, and clients must include both application/json and text/event-stream in their Accept headers. Much of the existing documentation online still describes the deprecated transport, making it important for developers to consult the updated protocol specification before building new implementations.

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