send method bugfix

Author: robinsonjohn

CHANGELOG.md

@@ -12,6 +12,12 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - `Fixed` for any bug fixes.
 - `Security` in case of vulnerabilities
 
+## [1.1.1] - 2020.11.23
+
+### Fixed
+
+- Fixed bug in `send` method where `$_SERVER` may not be set.
+
 ## [1.1.0] - 2020.10.20
 
 ### Added

src/Response.php

@@ -258,7 +258,15 @@ public function send(): void
 
         // -------------------- Status code --------------------
 
-        $protocol = $_SERVER['SERVER_PROTOCOL'];
+        if (isset($_SERVER['SERVER_PROTOCOL'])) {
+
+            $protocol = $_SERVER['SERVER_PROTOCOL'];
+
+        } else {
+
+            $protocol = 'HTTP/1.1';
+
+        }
 
         $status = $this->getStatusCode();