Mark HTML5 responses as dynamic

services/api-server/src/api_server/main.py

@@ -8442,7 +8442,11 @@ def _html5_sse_headers() -> dict[str, str]:
 
 
 def _html5_response(fragment: str) -> Response:
-    return Response(fragment, media_type="text/html; charset=utf-8")
+    return Response(
+        fragment,
+        media_type="text/html; charset=utf-8",
+        headers={"Cache-Control": "no-cache, no-transform"},
+    )
 
 
 def _html5_sse_response(content: Any) -> StreamingResponse: