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[v1.x] Expire idle Streamable HTTP sessions by default and cap concurrent sessions (#3426)

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Max 2026-09-02 16:06:38 +01:00 • committed by GitHub
commit 92120b4b0f
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17
tests/server/fastmcp/test_server.py
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@ -1544,3 +1544,20 @@ async def test_sse_app_applies_the_configured_request_body_limit() -> None:
headers={"Content-Type": "application/json"},
)
assert response.status_code == 413
def test_streamable_http_app_passes_the_configured_session_limits_to_its_manager() -> None:
"""SDK-defined: FastMCP forwards `session_idle_timeout` and `max_sessions` to the Streamable HTTP manager;
by default sessions expire after 30 idle minutes and one process holds at most 10 000 of them."""
default = FastMCP()
default.streamable_http_app()
assert (default.session_manager.session_idle_timeout, default.session_manager.max_sessions) == (30 * 60, 10_000)
tuned = FastMCP(session_idle_timeout=5, max_sessions=7)
assert (tuned.settings.session_idle_timeout, tuned.settings.max_sessions) == (5, 7)
tuned.streamable_http_app()
assert (tuned.session_manager.session_idle_timeout, tuned.session_manager.max_sessions) == (5, 7)
unbounded = FastMCP(session_idle_timeout=None, max_sessions=None)
unbounded.streamable_http_app()
assert (unbounded.session_manager.session_idle_timeout, unbounded.session_manager.max_sessions) == (None, None)