Add getTrailers and withTrailers methods for Response

Author: huangzhhui

src/Server/Response.php

@@ -22,6 +22,11 @@ class Response extends \Hyperf\HttpMessage\Base\Response
  */
  protected $cookies = [];
 
+ /**
+ * @var array
+ */
+ protected $trailers = [];
+
  /**
  * Returns an instance with body content.
  */
@@ -49,4 +54,16 @@ public function getCookies(): array
  {
  return $this->cookies;
  }
+
+ public function withTrailer(string $key, $value): self
+ {
+ $new = clone $this;
+ $new->trailers[$key] = $value;
+ return $new;
+ }
+
+ public function getTrailers(): array
+ {
+ return $this->trailers;
+ }
 }