diff --git a/exposures/files/npmrc-authtoken.yaml b/exposures/files/npmrc-authtoken.yaml
index d573b8c253..ed60448585 100644
--- a/exposures/files/npmrc-authtoken.yaml
+++ b/exposures/files/npmrc-authtoken.yaml
@@ -25,6 +25,14 @@ requests:
           - "_auth="
         condition: or
 
+      - type: word
+        part: header
+        words:
+          - "text/html"
+          - "application/javascript"
+          - "application/json"
+        negative: true
+
       - type: status
         status:
           - 200