Request::getReferer() returns UrlImmutable (BC break)

Author: dg

src/Http/IRequest.php

@@ -12,7 +12,7 @@
 
 /**
  * IHttpRequest provides access scheme for request sent via HTTP.
- * @method Url|null getReferer() Returns referrer.
+ * @method UrlImmutable|null getReferer() Returns referrer.
  */
 interface IRequest
 {

src/Http/Request.php

@@ -208,9 +208,11 @@ public function getHeaders(): array
 	/**
 	 * Returns referrer.
 	 */
-	public function getReferer(): ?Url
+	public function getReferer(): ?UrlImmutable
 	{
-		return isset($this->headers['referer']) ? new Url($this->headers['referer']) : null;
+		return isset($this->headers['referer'])
+			? new UrlImmutable($this->headers['referer'])
+			: null;
 	}