diff --git a/lib/bindings/http/emitter_binary_0_1.js b/lib/bindings/http/emitter_binary_0_1.js
index 5bac97b..d5d4001 100644
--- a/lib/bindings/http/emitter_binary_0_1.js
+++ b/lib/bindings/http/emitter_binary_0_1.js
@@ -1,11 +1,15 @@
 var axios = require("axios");
 
+const Constants = require("./constants.js");
+
 function HTTPBinary(configuration){
   this.config = configuration;
 
-  this.config["headers"] = {
-    "Content-Type":"application/cloudevents+json; charset=utf-8"
-  };
+  this.config["headers"] = {};
+
+  this.config["headers"]
+    [Constants.HEADER_CONTENT_TYPE] =
+      Constants.MIME_CE_JSON + "; charset=" + Constants.CHARSET_DEFAULT;
 }
 
 HTTPBinary.prototype.emit = function(cloudevent){
@@ -17,7 +21,7 @@ HTTPBinary.prototype.emit = function(cloudevent){
   var _headers = _config["headers"];
 
   if(cloudevent.getContenttype()) {
-    _headers["Content-Type"] = cloudevent.getContenttype();
+    _headers[Constants.HEADER_CONTENT_TYPE] = cloudevent.getContenttype();
   }
 
   _headers["CE-EventType"] = cloudevent.getType();