From 1f7f007fd92edc8eb694a19bc2e8bf0d5aad0ee2 Mon Sep 17 00:00:00 2001
From: Jeremiah Lowin <153965+jlowin@users.noreply.github.com>
Date: Mon, 5 May 2025 11:21:39 -0400
Subject: [PATCH 1/2] Add timeout-graceful-shutdown as a default config

---
 src/fastmcp/server/server.py | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/src/fastmcp/server/server.py b/src/fastmcp/server/server.py
index 5c221d770..e0b96e90a 100644
--- a/src/fastmcp/server/server.py
+++ b/src/fastmcp/server/server.py
@@ -826,16 +826,19 @@ class FastMCP(Generic[LifespanResultT]):
         host: str | None = None,
         port: int | None = None,
         log_level: str | None = None,
+        uvicorn_config: dict | None = None,
     ) -> None:
         """Run the server using SSE transport."""
-        app = self.sse_app()
-        app = RequestMiddleware(app)
+        uvicorn_config = uvicorn_config or {}
+        uvicorn_config.setdefault("timeout_graceful_shutdown", 0)
+        app = RequestMiddleware(self.sse_app())
 
         config = uvicorn.Config(
             app,
             host=host or self.settings.host,
             port=port or self.settings.port,
             log_level=log_level or self.settings.log_level.lower(),
+            **uvicorn_config,
         )
         server = uvicorn.Server(config)
         await server.serve()

From 396207f17771961e4863c3ee631f778217644687 Mon Sep 17 00:00:00 2001
From: Jeremiah Lowin <153965+jlowin@users.noreply.github.com>
Date: Mon, 5 May 2025 11:24:06 -0400
Subject: [PATCH 2/2] Update server.py

---
 src/fastmcp/server/server.py | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/fastmcp/server/server.py b/src/fastmcp/server/server.py
index e0b96e90a..1de7dd908 100644
--- a/src/fastmcp/server/server.py
+++ b/src/fastmcp/server/server.py
@@ -830,6 +830,8 @@ class FastMCP(Generic[LifespanResultT]):
     ) -> None:
         """Run the server using SSE transport."""
         uvicorn_config = uvicorn_config or {}
+        # the SSE app hangs even when a signal is sent, so we disable the timeout to make it possible to close immediately.
+        # see https://github.com/jlowin/fastmcp/issues/296
         uvicorn_config.setdefault("timeout_graceful_shutdown", 0)
         app = RequestMiddleware(self.sse_app())