diff --git a/lib/bindings/http/receiver_binary.js b/lib/bindings/http/receiver_binary.js
index 1c5102e..cb8f2b6 100644
--- a/lib/bindings/http/receiver_binary.js
+++ b/lib/bindings/http/receiver_binary.js
@@ -27,7 +27,9 @@ function BinaryHTTPReceiver(
   setterByHeader,
   allowedContentTypes,
   requiredHeaders,
-  Spec) {
+  Spec,
+  specversion,
+  extensionsPrefix) {
 
   this.parserByType = parserByType;
   this.setterByHeader = setterByHeader;
@@ -35,6 +37,8 @@ function BinaryHTTPReceiver(
   this.requiredHeaders = requiredHeaders;
   this.Spec = Spec;
   this.spec = new Spec();
+  this.specversion = specversion;
+  this.extensionsPrefix = extensionsPrefix;
 }
 
 BinaryHTTPReceiver.prototype.check = function(payload, headers) {
@@ -59,10 +63,10 @@ BinaryHTTPReceiver.prototype.check = function(payload, headers) {
       throw {message: "header '" + required + "' not found"};
     });
 
-  if(sanityHeaders[Constants.BINARY_HEADERS_02.SPEC_VERSION] !== "0.2"){
+  if(sanityHeaders[Constants.DEFAULT_SPEC_VERSION_HEADER] !== this.specversion){
     throw {
       message: "invalid spec version",
-      errors: [sanityHeaders[Constants.BINARY_HEADERS_02.SPEC_VERSION]]
+      errors: [sanityHeaders[Constants.DEFAULT_SPEC_VERSION_HEADER]]
     };
   }
 
@@ -101,12 +105,12 @@ BinaryHTTPReceiver.prototype.parse = function(payload, headers) {
   Array.from(Object.keys(sanityHeaders))
   .filter((value) => !processedHeaders.includes(value))
   .filter((value) =>
-    value.startsWith(Constants.BINARY_HEADERS_02.EXTENSIONS_PREFIX))
+    value.startsWith(this.extensionsPrefix))
   .map((extension) =>
-    extension.substring(Constants.BINARY_HEADERS_02.EXTENSIONS_PREFIX.length)
+    extension.substring(this.extensionsPrefix.length)
   ).forEach((extension) =>
     cloudevent.addExtension(extension,
-      sanityHeaders[Constants.BINARY_HEADERS_02.EXTENSIONS_PREFIX+extension])
+      sanityHeaders[this.extensionsPrefix+extension])
   );
 
   // Sets the data