Patch http.client to not do I/O in the event loop (#34194)

homeassistant/block_async_io.py

@@ -0,0 +1,14 @@
+"""Block I/O being done in asyncio."""
+from http.client import HTTPConnection
+
+from homeassistant.util.async_ import protect_loop
+
+
+def enable() -> None:
+    """Enable the detection of I/O in the event loop."""
+    # Prevent urllib3 and requests doing I/O in event loop
+    HTTPConnection.putrequest = protect_loop(HTTPConnection.putrequest)
+
+    # Currently disabled. pytz doing I/O when getting timezone.
+    # Prevent files being opened inside the event loop
+    # builtins.open = protect_loop(builtins.open)