diff --git a/lib/bindings/http/constants.js b/lib/bindings/http/constants.js
index fafb771..cd23bd5 100644
--- a/lib/bindings/http/constants.js
+++ b/lib/bindings/http/constants.js
@@ -1,7 +1,10 @@
 // Commons
 module.exports = {
+  HEADERS : "headers",
   CHARSET_DEFAULT : "utf-8",
 
+  DATA_ATTRIBUTE : "data",
+
   MIME_JSON         : "application/json",
   MIME_OCTET_STREAM : "application/octet-stream",
   MIME_CE           : "application/cloudevents",