diff --git a/uvicorn/protocols/http/httptools_impl.py b/uvicorn/protocols/http/httptools_impl.py
index 7a60733ce..ebff26ac8 100644
--- a/uvicorn/protocols/http/httptools_impl.py
+++ b/uvicorn/protocols/http/httptools_impl.py
@@ -443,6 +443,7 @@ async def send(self, message):
 
             status_code = message["status"]
             headers = self.default_headers + list(message.get("headers", []))
+            self.scope["response_headers"] = headers
 
             if self.access_log:
                 self.access_logger.info(