Add current request context to get_url helper (#38602)

tests/components/http/test_request_context.py

@@ -0,0 +1,33 @@
+"""Test request context middleware."""
+from contextvars import ContextVar
+
+from aiohttp import web
+
+from homeassistant.components.http.request_context import setup_request_context
+
+
+async def test_request_context_middleware(aiohttp_client):
+    """Test that request context is set from middleware."""
+    context = ContextVar("request", default=None)
+    app = web.Application()
+
+    async def mock_handler(request):
+        """Return the real IP as text."""
+        request_context = context.get()
+        assert request_context
+        assert request_context == request
+
+        return web.Response(text="hi!")
+
+    app.router.add_get("/", mock_handler)
+    setup_request_context(app, context)
+    mock_api_client = await aiohttp_client(app)
+
+    resp = await mock_api_client.get("/")
+    assert resp.status == 200
+
+    text = await resp.text()
+    assert text == "hi!"
+
+    # We are outside of the context here, should be None
+    assert context.get() is None