diff --git a/src/MD_STD.php b/src/MD_STD.php
index 0e78530..1aec7da 100644
--- a/src/MD_STD.php
+++ b/src/MD_STD.php
@@ -288,15 +288,20 @@ final class MD_STD {
     /**
      * Wrapper for curling contents from the web.
      *
-     * @param string  $url     URL to query.
-     * @param integer $timeout Timeout in milliseconds.
+     * @param string        $url     URL to query.
+     * @param integer       $timeout Timeout in milliseconds.
+     * @param array<string> $headers HTTP headers to pass on.
+     *                               Analogous to CURLOPT_HTTPHEADER.
      *
      * @return string
      */
-    public static function runCurl(string $url, int $timeout = 1200):string {
+    public static function runCurl(string $url, int $timeout = 1200, array $headers = []):string {
 
         $curl = self::curl_init($url, $timeout);
         \curl_setopt($curl, CURLOPT_RETURNTRANSFER, true);
+        if (!empty($headers)) {
+            \curl_setopt($curl, CURLOPT_HTTPHEADER, $headers);
+        }
 
         $result = \curl_exec($curl);
 
@@ -317,38 +322,43 @@ final class MD_STD {
      *
      * @param array<string> $urls    URL to query.
      * @param integer       $timeout Timeout in milliseconds.
+     * @param array<string> $headers HTTP headers to pass on.
+     *                               Analogous to CURLOPT_HTTPHEADER.
      *
      * @return array<string>
      */
-    public static function runCurlMulti(array $urls, int $timeout = 1200):array {
+    public static function runCurlMulti(array $urls, int $timeout = 1200, array $headers = []):array {
 
-        $mh = curl_multi_init();
+        $mh = \curl_multi_init();
 
         $curl_array = [];
         foreach($urls as $i => $url) {
 
             $curl_array[$i] = self::curl_init($url, $timeout);
 
-            curl_setopt($curl_array[$i], CURLOPT_RETURNTRANSFER, true);
-            curl_multi_add_handle($mh, $curl_array[$i]);
+            \curl_setopt($curl_array[$i], CURLOPT_RETURNTRANSFER, true);
+            if (!empty($headers)) {
+                \curl_setopt($curl_array[$i], CURLOPT_HTTPHEADER, $headers);
+            }
+            \curl_multi_add_handle($mh, $curl_array[$i]);
 
         }
 
         $running = null;
         do {
-            usleep(10000);
-            curl_multi_exec($mh, $running);
+            \usleep(10000);
+            \curl_multi_exec($mh, $running);
         } while($running > 0);
 
         $res = [];
         foreach($urls as $i => $url) {
-            $res[$i] = curl_multi_getcontent($curl_array[$i]) ?: '';
+            $res[$i] = \curl_multi_getcontent($curl_array[$i]) ?: '';
         }
 
         foreach($urls as $i => $url){
-            curl_multi_remove_handle($mh, $curl_array[$i]);
+            \curl_multi_remove_handle($mh, $curl_array[$i]);
         }
-        curl_multi_close($mh);
+        \curl_multi_close($mh);
 
         return $res;