Limit the headers we are analysing

Author: NielsLeenheer

src/Analyser/Header.php

@@ -139,9 +139,11 @@ private function additionalUserAgent($ua)
 
     private function getHeader($h)
     {
+        /* Find the header that matches */
         foreach ($this->headers as $k => $v) {
             if (strtolower($h) == strtolower($k)) {
-                return $v;
+                /* And return the first 1024 bytes */
+                return substr($v, 0, 1024);
             }
         }
     }