diff --git a/hassio/api/ingress.py b/hassio/api/ingress.py
index cabbb1fd5..788450439 100644
--- a/hassio/api/ingress.py
+++ b/hassio/api/ingress.py
@@ -209,8 +209,8 @@ def _is_websocket(request: web.Request) -> bool:
     headers = request.headers
 
     if (
-        headers.get(hdrs.CONNECTION) == "Upgrade"
-        and headers.get(hdrs.UPGRADE) == "websocket"
+        headers.get(hdrs.CONNECTION, "").lower() == "upgrade"
+        and headers.get(hdrs.UPGRADE, "").lower() == "websocket"
     ):
         return True
     return False