fix: use simple sleep for server readiness, restore Windows parallelism

.github/workflows/run-tests.yml

@@ -48,13 +48,7 @@ jobs:
         run: uv sync --upgrade
 
       - name: Run tests (excluding integration and client_process)
-        run: |
-          if [ "$RUNNER_OS" == "Windows" ]; then
-            # Run without parallelism on Windows to debug xdist crashes
-            uv run pytest --inline-snapshot=disable tests -m "not integration and not client_process"
-          else
-            uv run pytest --inline-snapshot=disable tests -m "not integration and not client_process" --numprocesses auto --maxprocesses 4 --dist worksteal
-          fi
+        run: uv run pytest --inline-snapshot=disable tests -m "not integration and not client_process" --numprocesses auto --maxprocesses 4 --dist worksteal
         shell: bash
 
       - name: Run client process tests separately

src/fastmcp/utilities/tests.py

@@ -212,15 +212,8 @@ async def run_server_async(
     # Wait for server lifespan to be ready
     await server._started.wait()
 
-    # Wait for HTTP server to be ready by making a request
-    url = f"http://{host}:{port}{path}"
-    async with httpx.AsyncClient() as client:
-        for _ in range(50):  # 50 * 0.1s = 5s timeout
-            try:
-                await client.get(url, timeout=0.1)
-                break
-            except (httpx.ConnectError, httpx.TimeoutException):
-                await asyncio.sleep(0.1)
+    # Give uvicorn a moment to bind the port after lifespan is ready
+    await asyncio.sleep(0.1)
 
     try:
         yield f"http://{host}:{port}{path}"