diff --git a/src/RREST.php b/src/RREST.php
index c521fe3..d8e9b33 100644
--- a/src/RREST.php
+++ b/src/RREST.php
@@ -107,7 +107,7 @@ public function addRoute()
 
         //accept
         $acceptValidator = new AcceptValidator(
-            $this->getHeader('Accept'),
+            HTTP::getHeader('Accept'),
             $this->apiSpec->getResponsePayloadBodyContentTypes()
         );
         if($acceptValidator->fails()) {
@@ -116,7 +116,7 @@ public function addRoute()
         $accept = $acceptValidator->getBestAccept();
 
         //content-type
-        $contentType = $this->getHeader('Content-Type');
+        $contentType = HTTP::getHeader('Content-Type');
         $contentTypeValidator = new ContentTypeValidator(
             $contentType,
             $this->apiSpec->getRequestPayloadBodyContentTypes()
@@ -432,25 +432,4 @@ private function cast($value, $type)
 
         return $castValue;
     }
-
-    /**
-     * @param string $name
-     *
-     * @return string
-     */
-    private function getHeader($name)
-    {
-        $name = strtolower($name);
-        if (empty($this->headers)) {
-            $this->headers = array_change_key_case(getallheaders(), CASE_LOWER);
-            if (empty($this->headers)) {
-                $this->headers = array_change_key_case($_SERVER, CASE_LOWER);
-            }
-        }
-        if (isset($this->headers[$name])) {
-            return $this->headers[$name];
-        }
-
-        return;
-    }
 }
diff --git a/src/Util/HTTP.php b/src/Util/HTTP.php
index de229c9..2062138 100644
--- a/src/Util/HTTP.php
+++ b/src/Util/HTTP.php
@@ -26,4 +26,23 @@ public static function getProtocol()
 
         return $isSecure ? 'HTTPS' : 'HTTP';
     }
+
+    /**
+     * @param string $name
+     *
+     * @return string|null
+     */
+    public static function getHeader($name)
+    {
+        $name = strtolower($name);
+        $headers = array_change_key_case(\getallheaders(), CASE_LOWER);
+        if (empty($headers)) {
+            $headers = array_change_key_case($_SERVER, CASE_LOWER);
+        }
+        if (isset($headers[$name])) {
+            return $headers[$name];
+        }
+
+        return null;
+    }
 }
\ No newline at end of file
diff --git a/tests/units/Util/HTTP.php b/tests/units/Util/HTTP.php
new file mode 100644
index 0000000..71a3843
--- /dev/null
+++ b/tests/units/Util/HTTP.php
@@ -0,0 +1,61 @@
+<?php
+
+namespace RREST\tests\units\Util;
+
+require_once __DIR__ . '/../boostrap.php';
+
+use atoum;
+use RREST\Util\HTTP as UTILHTTP;
+
+class HTTP extends atoum
+{
+    public function testGetProtocolFromSERVER()
+    {
+        $this
+            ->string(UTILHTTP::getProtocol())
+            ->isEqualTo('HTTP')
+        ;
+
+        $_SERVER['HTTPS'] = 'on';
+        $this
+            ->string(UTILHTTP::getProtocol())
+            ->isEqualTo('HTTPS')
+        ;
+
+        $_SERVER['HTTPS'] = 'x';
+        $this
+            ->string(UTILHTTP::getProtocol())
+            ->isEqualTo('HTTP')
+        ;
+    }
+
+    public function testGetProtocolFromHTTPX()
+    {
+        $_SERVER['HTTP_X_FORWARDED_PROTO'] = 'https';
+        $this
+            ->string(UTILHTTP::getProtocol())
+            ->isEqualTo('HTTPS')
+        ;
+
+        $_SERVER['HTTP_X_FORWARDED_PROTO'] = 'http';
+        $_SERVER['HTTP_X_FORWARDED_SSL'] = 'on';
+        $this
+            ->string(UTILHTTP::getProtocol())
+            ->isEqualTo('HTTPS')
+        ;
+    }
+
+    public function testGetHeaderFromSERVER()
+    {
+        $_SERVER['content-type'] = 'x';
+        $this
+            ->string(UTILHTTP::getHeader('Content-Type'))
+            ->isEqualTo('x')
+        ;
+
+        $this
+            ->variable(UTILHTTP::getHeader('X-HEADER'))
+            ->isNull()
+        ;
+    }
+}
\ No newline at end of file