diff --git a/lib/http.js b/lib/http.js
index 6761b53..9b3b7ad 100644
--- a/lib/http.js
+++ b/lib/http.js
@@ -181,9 +181,11 @@ var HTTPObject = function(engine) {
 
                 switch (key.toUpperCase()) {
                     case "CONTENT-TYPE":
+                        console.warn("Will be forget the previous CONTENT-TYPE");
                         this.setContentType(value.toLowerCase());
                         break;
                     case "COOKIE":
+                        console.warn("Will be forget the previous COOKIE");
                         this.setCookie(value);
                         break;
                     default: