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Remove unused StreamableHTTPTransport.get_session_id() (#3205)

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Max 2026-07-28 13:55:02 +01:00 • committed by GitHub
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docs/migration.md
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@ -2110,7 +2110,7 @@ Client-side stream resumption is also unchanged: the transport reconnects a drop
The `get_session_id` callback (third element of the returned tuple) has been removed from `streamable_http_client`. The function now returns a 2-tuple `(read_stream, write_stream)` instead of a 3-tuple.
The `GetSessionIdCallback` type alias is gone as well, so `from mcp.client.streamable_http import GetSessionIdCallback` now raises `ImportError`. Drop the annotation, or inline `Callable[[], str | None]` if your own wrapper code still needs the type.
The `GetSessionIdCallback` type alias is gone as well, so `from mcp.client.streamable_http import GetSessionIdCallback` now raises `ImportError`. Drop the annotation, or inline `Callable[[], str | None]` if your own wrapper code still needs the type. The `StreamableHTTPTransport.get_session_id()` method that backed the callback is removed too.
If you need to capture the session ID (e.g., for session resumption testing), you can use httpx2 event hooks to capture it from the response headers: