diff --git a/uvicorn/protocols/websockets/websockets_impl.py b/uvicorn/protocols/websockets/websockets_impl.py
index 87e7baa36..563a45eaa 100644
--- a/uvicorn/protocols/websockets/websockets_impl.py
+++ b/uvicorn/protocols/websockets/websockets_impl.py
@@ -103,14 +103,14 @@ def __init__(
             max_size=self.config.ws_max_size,
             ping_interval=self.config.ws_ping_interval,
             ping_timeout=self.config.ws_ping_timeout,
-            server_header=None,
             extensions=extensions,
             logger=logging.getLogger("uvicorn.error"),
-            extra_headers=[
-                (name.decode("latin-1"), value.decode("latin-1"))
-                for name, value in server_state.default_headers
-            ],
         )
+        self.server_header = None
+        self.extra_headers = [
+            (name.decode("latin-1"), value.decode("latin-1"))
+            for name, value in server_state.default_headers
+        ]
 
     def connection_made(  # type: ignore[override]
         self, transport: asyncio.Transport