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Title: fix: propagate pre-endpoint errors in sse_client instead of deadlocking by maxisbey · Pull Request #2340 · modelcontextprotocol/python-sdk · GitHub

Open Graph Title: fix: propagate pre-endpoint errors in sse_client instead of deadlocking by maxisbey · Pull Request #2340 · modelcontextprotocol/python-sdk

X Title: fix: propagate pre-endpoint errors in sse_client instead of deadlocking by maxisbey · Pull Request #2340 · modelcontextprotocol/python-sdk

Description: The official Python SDK for Model Context Protocol servers and clients - fix: propagate pre-endpoint errors in sse_client instead of deadlocking by maxisbey · Pull Request #2340 · modelcontextprotocol/python-sdk

Open Graph Description: Fixes #447 Problem sse_client launches sse_reader via tg.start(), which blocks until task_status.started() is called. When an error occurs before the endpoint event is received, the except Exceptio...

X Description: Fixes #447 Problem sse_client launches sse_reader via tg.start(), which blocks until task_status.started() is called. When an error occurs before the endpoint event is received, the except Exceptio...

Opengraph URL: https://github.com/modelcontextprotocol/python-sdk/pull/2340

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Mar 24, 2026https://github.com/modelcontextprotocol/python-sdk/pull/2340#issue-4131006312
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fix(client): propagate SSE POST errors to caller instead of hanging (#2110) #2483 https://github.com/modelcontextprotocol/python-sdk/pull/2483
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sse_client blocks indefinitely when server has incorrect base URL https://github.com/modelcontextprotocol/python-sdk/issues/447
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