diff --git a/src/OAuth2/ResourceServer.php b/src/OAuth2/ResourceServer.php
index 2f7ef991..6bf3578c 100644
--- a/src/OAuth2/ResourceServer.php
+++ b/src/OAuth2/ResourceServer.php
@@ -161,7 +161,7 @@ class ResourceServer
     protected function determineAccessToken()
     {
         if ($header = $this->getRequest()->header('Authorization')) {
-            $access_token = trim(str_replace('Bearer', '', $header));
+            $access_token = base64_decode(trim(str_replace('Bearer', '', $header)));
         } else {
             $method = $this->getRequest()->server('REQUEST_METHOD');
             $access_token = $this->getRequest()->{$method}($this->tokenKey);
diff --git a/src/OAuth2/Util/Request.php b/src/OAuth2/Util/Request.php
index 1b201057..eefe37d0 100644
--- a/src/OAuth2/Util/Request.php
+++ b/src/OAuth2/Util/Request.php
@@ -65,11 +65,15 @@ class Request implements RequestInterface
 
     protected function readHeaders()
     {
-        $headers = array();
-        foreach ($this->server() as $name => $value) {
-            if (substr($name, 0, 5) == 'HTTP_') {
-                $name = str_replace(' ', '-', ucwords(strtolower(str_replace('_', ' ', substr($name, 5)))));
-                $headers[$name] = $value;
+        if (function_exists('getallheaders')) {
+            $headers = getallheaders();
+        } else {
+            $headers = array();
+            foreach ($this->server() as $name => $value) {
+                if (substr($name, 0, 5) == 'HTTP_') {
+                    $name = str_replace(' ', '-', ucwords(strtolower(str_replace('_', ' ', substr($name, 5)))));
+                    $headers[$name] = $value;
+                }
             }
         }
 
@@ -91,4 +95,4 @@ class Request implements RequestInterface
 
         return $this->{$property}[$index];
     }
-}
+}
\ No newline at end of file