Transports changedspecification/2025-03-26/basic/transports
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5050> [!NOTE]
5151>
5252> This replaces the [HTTP+SSE
53> transport](/specification/2024-11-05/basic/transports#http-with-sse) from
53> transport](/specification/2024-11-05/basic/transports.md#http-with-sse) from
5454> protocol version 2024-11-05. See the [backwards compatibility](#backwards-compatibility)
5555> guide below.
5656
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176176### Session Management
177177
178178An MCP "session" consists of logically related interactions between a client and a
179server, beginning with the [initialization phase](/specification/2025-03-26/basic/lifecycle). To support
179server, beginning with the [initialization phase](/specification/2025-03-26/basic/lifecycle.md). To support
180180servers which want to establish stateful sessions:
181181
1821821. A server using the Streamable HTTP transport **MAY** assign a session ID at
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246246### Backwards Compatibility
247247
248248Clients and servers can maintain backwards compatibility with the deprecated [HTTP+SSE
249transport](/specification/2024-11-05/basic/transports#http-with-sse) (from
249transport](/specification/2024-11-05/basic/transports.md#http-with-sse) (from
250250protocol version 2024-11-05) as follows:
251251
252252**Servers** wanting to support older clients should:
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