Implement our own CacheMiddleware class that supports POST requests a…

…s well as GET

inc/http-client/class-cache-middleware.php

@@ -0,0 +1,13 @@
+<?php
+
+namespace RemoteDataBlocks\HttpClient;
+
+use Kevinrob\GuzzleCache\CacheMiddleware as GuzzleCacheCacheMiddleware;
+
+class CacheMiddleware extends GuzzleCacheCacheMiddleware {
+	// phpcs:ignore WordPress.NamingConventions.ValidVariableName.PropertyNotSnakeCase
+	protected $httpMethods = [
+		'GET'  => true,
+		'POST' => true,
+	];
+}

inc/http-client/class-http-client.php

@@ -10,12 +10,12 @@
 use GuzzleHttp\MessageFormatter;
 use GuzzleHttp\Middleware;
 use GuzzleHttp\Promise\Utils;
-use Kevinrob\GuzzleCache\CacheMiddleware;
 use Kevinrob\GuzzleCache\KeyValueHttpHeader;
 use Kevinrob\GuzzleCache\Storage\WordPressObjectCacheStorage;
 use Psr\Http\Message\RequestInterface;
 use Psr\Http\Message\ResponseInterface;
 use Psr\Http\Message\UriInterface;
+use RemoteDataBlocks\HttpClient\CacheMiddleware;
 use RemoteDataBlocks\HttpClient\CacheStrategy;
 use RemoteDataBlocks\Logging\LoggerManager;
 

inc/http-client/http-client.php

@@ -1,4 +1,5 @@
 <?php
 
+require_once __DIR__ . '/class-cache-middleware.php';
 require_once __DIR__ . '/class-cache-strategy.php';
 require_once __DIR__ . '/class-http-client.php';