diff --git a/README b/README
deleted file mode 100644
index 3cf36ac..0000000
--- a/README
+++ /dev/null
@@ -1,4 +0,0 @@
-Mashape PHP client library v0.4
-Copyright (C) 2011 Mashape, Inc.
-
-For the documentation, please visit http://www.mashape.com/guide/consume/php
diff --git a/main/mashape/http/AuthUtil.php b/main/mashape/http/AuthUtil.php
index 646ab37..112a761 100644
--- a/main/mashape/http/AuthUtil.php
+++ b/main/mashape/http/AuthUtil.php
@@ -27,9 +27,8 @@
 class AuthUtil {
 
 	public static function generateAuthenticationHeader($publicKey, $privateKey) {
-		$uuid = uniqid();
-		$hash = hash_hmac("sha1", $uuid, $privateKey);
-		$header = "X-Mashape-Authorization: " . base64_encode($publicKey . ":" . $hash . $uuid) . "\r\n";
+		$hash = hash_hmac("sha1", $publicKey, $privateKey);
+		$header = "Proxy-Authorization: " . base64_encode($publicKey . ":" . $hash) . "\r\n";
 		return $header;
 	}