fix: correct header initialization to avoid TypeError

chalmerlowe · chalmerlowe · commit 077fd255c6bb · 2026-01-13T09:26:35.000-05:00
diff --git a/google/auth/aws.py b/google/auth/aws.py
@@ -532,7 +532,7 @@ def _get_metadata_security_credentials(
         """
         headers = None
         if imdsv2_session_token is not None:
-            headers["X-aws-ec2-metadata-token"] = imdsv2_session_token
+            headers = {"X-aws-ec2-metadata-token": imdsv2_session_token}
 
         response = request(
             url="{}/{}".format(self._security_credentials_url, role_name),
