Fix url property in response

Author: srtfisher

CHANGELOG.md

@@ -5,6 +5,12 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## v1.12.2
+
+### Fixed
+
+- Fixed issue with the `url` property in `Mantle\Http_Client\Response` not being initialized properly.
+
 ## v1.12.1
 
 ### Changed

src/mantle/http-client/class-response.php

@@ -77,7 +77,7 @@ class Response implements ArrayAccess {
 	/**
 	 * The request URL.
 	 */
-	protected readonly ?string $url;
+	protected ?string $url = null;
 
 	/**
 	 * Determine if the response was created from the cache.