Fix HTTP transport timeout defaulting to 5 seconds (#2849)

tests/integration_tests/test_timeout_fix.py

@@ -0,0 +1,51 @@
+"""Test that verifies the timeout fix for issue #2842 and #2845."""
+
+import asyncio
+
+import pytest
+
+from fastmcp import FastMCP
+from fastmcp.client import Client
+from fastmcp.client.transports import StreamableHttpTransport
+from fastmcp.utilities.tests import run_server_async
+
+
+def create_test_server() -> FastMCP:
+    """Create a FastMCP server with a slow tool."""
+    server = FastMCP("TestServer")
+
+    @server.tool
+    async def slow_tool(duration: int = 6) -> str:
+        """A tool that takes some time to complete."""
+        await asyncio.sleep(duration)
+        return f"Completed in {duration} seconds"
+
+    return server
+
+
+@pytest.fixture
+async def streamable_http_server():
+    """Start a test server and return its URL."""
+    server = create_test_server()
+    async with run_server_async(server) as url:
+        yield url
+
+
+@pytest.mark.integration
+@pytest.mark.timeout(15)
+async def test_slow_tool_with_http_transport(streamable_http_server: str):
+    """Test that tools taking >5 seconds work correctly with HTTP transport.
+
+    This test verifies the fix for:
+    - Issue #2842: Client can't get result after upgrading to 2.14.2
+    - Issue #2845: Server doesn't return results when tool takes >5 seconds
+
+    The root cause was that the httpx client was created without explicit
+    timeout configuration, defaulting to httpx's 5-second timeout.
+    """
+    async with Client(
+        transport=StreamableHttpTransport(streamable_http_server)
+    ) as client:
+        # This should NOT timeout since we fixed the default timeout
+        result = await client.call_tool("slow_tool", {"duration": 6})
+        assert result.data == "Completed in 6 seconds"