From 6ea606a98d8d670270457a02e6a84fe0340dc3f6 Mon Sep 17 00:00:00 2001
From: Jeremiah Lowin <153965+jlowin@users.noreply.github.com>
Date: Sat, 1 Nov 2025 12:28:35 -0700
Subject: [PATCH] Remove deprecated sse_app method (#2337)

---
 src/fastmcp/server/server.py        | 31 -----------------------------
 tests/client/test_sse.py            |  2 +-
 tests/deprecated/test_deprecated.py |  9 ---------
 3 files changed, 1 insertion(+), 41 deletions(-)

diff --git a/src/fastmcp/server/server.py b/src/fastmcp/server/server.py
index a85e9d6ad..70d00b7bd 100644
--- a/src/fastmcp/server/server.py
+++ b/src/fastmcp/server/server.py
@@ -2081,37 +2081,6 @@ class FastMCP(Generic[LifespanResultT]):
             uvicorn_config=uvicorn_config,
         )
 
-    def sse_app(
-        self,
-        path: str | None = None,
-        message_path: str | None = None,
-        middleware: list[ASGIMiddleware] | None = None,
-    ) -> StarletteWithLifespan:
-        """
-        Create a Starlette app for the SSE server.
-
-        Args:
-            path: The path to the SSE endpoint
-            message_path: The path to the message endpoint
-            middleware: A list of middleware to apply to the app
-        """
-        # Deprecated since 2.3.2
-        if fastmcp.settings.deprecation_warnings:
-            warnings.warn(
-                "The sse_app method is deprecated (as of 2.3.2). Use http_app as a modern (non-SSE) "
-                "alternative, or call `fastmcp.server.http.create_sse_app` directly.",
-                DeprecationWarning,
-                stacklevel=2,
-            )
-        return create_sse_app(
-            server=self,
-            message_path=message_path or self._deprecated_settings.message_path,
-            sse_path=path or self._deprecated_settings.sse_path,
-            auth=self.auth,
-            debug=self._deprecated_settings.debug,
-            middleware=middleware,
-        )
-
     def streamable_http_app(
         self,
         path: str | None = None,
diff --git a/tests/client/test_sse.py b/tests/client/test_sse.py
index 7110d5cfd..b0c9199b2 100644
--- a/tests/client/test_sse.py
+++ b/tests/client/test_sse.py
@@ -8,6 +8,7 @@ from mcp import McpError
 from fastmcp.client import Client
 from fastmcp.client.transports import SSETransport
 from fastmcp.server.dependencies import get_http_request
+from fastmcp.server.http import create_sse_app
 from fastmcp.server.server import FastMCP
 from fastmcp.utilities.tests import run_server_async
 
@@ -94,7 +95,6 @@ async def nested_sse_server():
     from starlette.applications import Starlette
     from starlette.routing import Mount
 
-    from fastmcp.server.http import create_sse_app
     from fastmcp.utilities.http import find_available_port
 
     server = create_test_server()
diff --git a/tests/deprecated/test_deprecated.py b/tests/deprecated/test_deprecated.py
index f172fd324..4f60579ec 100644
--- a/tests/deprecated/test_deprecated.py
+++ b/tests/deprecated/test_deprecated.py
@@ -33,15 +33,6 @@ class TestDeprecationWarningsSetting:
                 mcp.settings
 
 
-def test_sse_app_deprecation_warning():
-    """Test that sse_app raises a deprecation warning."""
-    server = FastMCP("TestServer")
-
-    with pytest.warns(DeprecationWarning, match="The sse_app method is deprecated"):
-        app = server.sse_app()
-        assert isinstance(app, Starlette)
-
-
 def test_streamable_http_app_deprecation_warning():
     """Test that streamable_http_app raises a deprecation warning."""
     server = FastMCP("TestServer")