Symfony version(s) affected

7.2.0

Description

Since deploying 7.2.0 in production today we are getting the occasional exception caught by Sentry (of a warning) when making http-client calls to remote sites.

Undefined array key "connection"

https://phil-taylor.sentry.io/share/issue/cf7fdf8815f3437f9faac44fd4d9065c/

The issue seems to have started with the PR#58562

dumping the headersdd($responses[$id]->headers); of a normal request, I can see there is no array keyconnection in the headers.

How to reproduce

<?php// composer req symfony/http-client symfony/var-dumperuseSymfony\Component\HttpClient\CurlHttpClient;error_reporting(E_ALL);ini_set('display_errors',1);require'vendor/autoload.php';$client =newCurlHttpClient();$response =$client->request('GET','https://symfony.com/');$content =$response->getContent(false);// then edit CurlResponse.php and dd the headers before line 319

Possible Solution

check the array key exists before use

Additional Context

No response