deprecate: Mark SSE transport as deprecated#2314
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goingforstudying-ctrl wants to merge 2 commits intomodelcontextprotocol:mainfrom
Closed
deprecate: Mark SSE transport as deprecated#2314goingforstudying-ctrl wants to merge 2 commits intomodelcontextprotocol:mainfrom
goingforstudying-ctrl wants to merge 2 commits intomodelcontextprotocol:mainfrom
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added 2 commits
March 19, 2026 21:27
The HTTP+SSE transport was replaced by Streamable HTTP in protocol revision 2025-03-26. This change adds DeprecationWarning and docstring markers to: - sse_client in mcp/client/sse.py - SseServerTransport in mcp/server/sse.py - run_sse_async in MCPServer - sse_app in MCPServer The warnings direct users to use StreamableHTTPTransport instead. Fixes modelcontextprotocol#2278
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Description
The HTTP+SSE transport was replaced by Streamable HTTP in protocol revision 2025-03-26. The spec now refers to it as the "deprecated HTTP+SSE transport".
This PR adds
warnings.warn(..., DeprecationWarning, stacklevel=2)and@deprecateddocstring markers to:sse_clientinsrc/mcp/client/sse.pySseServerTransportinsrc/mcp/server/sse.pyrun_sse_asyncinMCPServersse_appinMCPServerThe warnings direct users to use
StreamableHTTPTransportinstead, consistent with the TypeScript SDK which already marksSSEClientTransportas@deprecated.Testing
Fixes #2278