diff --git a/api/autoload.php b/api/autoload.php
index 0f14ff20..33ac8300 100644
--- a/api/autoload.php
+++ b/api/autoload.php
@@ -23,4 +23,17 @@ require_once(__DIR__ . '/../inc/custom_fields.inc.php');
 // Load the ApplicationContext
 $builder = new \DI\ContainerBuilder();
 
-$applicationContext = $builder->build();
\ No newline at end of file
+$applicationContext = $builder->build();
+
+// Fix for getallheaders() on PHP-FPM and nginx
+if (!function_exists('getallheaders')) {
+    function getallheaders() {
+        $headers = [];
+        foreach ($_SERVER as $name => $value) {
+            if (substr($name, 0, 5) == 'HTTP_') {
+                $headers[str_replace(' ', '-', ucwords(strtolower(str_replace('_', ' ', substr($name, 5)))))] = $value;
+            }
+        }
+        return $headers;
+    }
+}
\ No newline at end of file