feat: persist the HTTP client inside of EasyPostClient

CHANGELOG.md

@@ -4,6 +4,7 @@
 
 - Drops support for PHP 7.4
 - Adds support for PHP 8.3
+- Persists the HTTP client inside of the `EasyPostClient` via the `httpClient` property to reduce memory consumption on consecutive requests
 - Removed `withCarbonOffset` parameter from `create`, `buy`, and `regenerateRates` functions of the Shipment service as EasyPost now offers Carbon Neutral shipments by default for free
 - Fixes a bug where the original filtering criteria of `all` calls wasn't passed along to `getNextPage` calls. Now, these are persisted via a `_params` key on response objects locally
 - Removes the undocumented `createAndBuy` function from the `Batch` service. The proper usage is to create a batch first and buy it separately

lib/EasyPost/EasyPostClient.php

@@ -33,6 +33,7 @@
 use EasyPost\Service\TrackerService;
 use EasyPost\Service\UserService;
 use EasyPost\Service\WebhookService;
+use GuzzleHttp\Client;
 
 /**
  * Client used to send requests to the EasyPost API.
@@ -71,6 +72,7 @@ class EasyPostClient extends BaseService
     private $mockingUtility;
     public $requestEvent;
     public $responseEvent;
+    public $httpClient;
 
     /**
      * Constructor for an EasyPostClient.
@@ -93,6 +95,7 @@ public function __construct(
         $this->mockingUtility = $mockingUtility;
         $this->requestEvent = new RequestHook();
         $this->responseEvent = new ResponseHook();
+        $this->httpClient = new Client();
 
         if (!$this->apiKey) {
             throw new MissingParameterException(

lib/EasyPost/Http/Requestor.php

@@ -23,7 +23,6 @@
 use EasyPost\Exception\Api\TimeoutException;
 use EasyPost\Exception\Api\UnauthorizedException;
 use EasyPost\Exception\Api\UnknownApiException;
-use GuzzleHttp\Client;
 
 class Requestor
 {
@@ -205,10 +204,9 @@ private static function requestRaw($client, $method, $url, $params, $beta = fals
             $httpStatus = $matchingRequest->responseInfo->statusCode;
             $responseHeaders = [];
         } else {
-            $guzzleClient = new Client();
             $requestOptions['headers'] = $headers;
             try {
-                $response = $guzzleClient->request($method, $absoluteUrl, $requestOptions);
+                $response = $client->httpClient->request($method, $absoluteUrl, $requestOptions);
             } catch (\GuzzleHttp\Exception\ConnectException $error) {
                 throw new HttpException(sprintf(Constants::COMMUNICATION_ERROR, 'EasyPost', $error->getMessage()));
             }