test and ruff

Author: ihrpr

src/mcp/server/fastmcp/server.py

@@ -969,6 +969,7 @@ async def get_prompt(self, name: str, arguments: dict[str, Any] | None = None) -
             logger.exception(f"Error getting prompt {name}")
             raise ValueError(str(e))
 
+
 class StreamableHTTPASGIApp:
     """
     ASGI application for Streamable HTTP server transport.
@@ -980,6 +981,7 @@ def __init__(self, session_manager: StreamableHTTPSessionManager):
     async def __call__(self, scope: Scope, receive: Receive, send: Send) -> None:
         await self.session_manager.handle_request(scope, receive, send)
 
+
 class Context(BaseModel, Generic[ServerSessionT, LifespanContextT, RequestT]):
     """Context object providing access to MCP capabilities.
 

tests/server/fastmcp/test_server.py

@@ -1072,3 +1072,15 @@ def prompt_fn(name: str) -> str:
         async with client_session(mcp._mcp_server) as client:
             with pytest.raises(McpError, match="Missing required arguments"):
                 await client.get_prompt("prompt_fn")
+
+    def test_streamable_http_no_redirect(self):
+        """Test that /mcp endpoint does not cause 307 redirect (PR #1115)."""
+        from starlette.testclient import TestClient
+
+        mcp = FastMCP("test-redirect")
+        app = mcp.streamable_http_app()
+
+        with TestClient(app, raise_server_exceptions=False) as client:
+            # Test POST to /mcp - should NOT redirect
+            response = client.post("/mcp", json={"test": "data"}, follow_redirects=False)
+            assert response.status_code != 307