Check header names in lowercase

Author: nabeghe

composer.json

@@ -6,7 +6,6 @@
     "library", "helper", "support"
   ],
   "type": "library",
-  "version": "1.0.0",
   "homepage": "https://github.com/nabeghe/reflecty-php",
   "license": "MIT",
   "autoload": {

src/Headers.php

@@ -12,32 +12,38 @@ protected static function init()
     {
         if (!isset(static::$headers)) {
             $headers = getallheaders();
-            if (!is_array($headers)) {
+            if (is_array($headers)) {
+                $headers = array_change_key_case($headers);
+            } else {
                 $headers = [];
             }
+
             static::$headers = $headers;
         }
     }
 
     public static function all(): array
     {
         static::init();
+
         return static::$headers;
     }
 
     public static function get($name, $default = null)
     {
         static::init();
 
-        if (isset(static::$headers[$name])) {
-            return static::$headers[$name];
+        $lower_name = strtolower($name);
+
+        if (isset(static::$headers[$lower_name])) {
+            return static::$headers[$lower_name];
         }
 
         if (func_num_args() > 1) {
             return $default;
         }
 
-        return static::DEFAULTS[$name] ?? static::DEFAULT;
+        return static::DEFAULTS[$lower_name] ?? static::DEFAULTS[$name] ?? static::DEFAULT;
     }
 
     public static function flush()