[HttpClient] Fix getting through proxies via CONNECT

[nicolas-grekas]

Q	A
Branch?	5.4
Bug fix?	yes
New feature?	no
Deprecations?	no
Tickets	-
License	MIT
Doc PR	-

Spotted while trying to hit google via symfony proxy:start:

https_proxy=http://127.0.0.1:7080 php test.php

where test.php contains:

$client = new CurlHttpClient();

$r = $client->request('GET', 'https://google.com/');

dump($r->getStatusCode());
dump($r->getHeaders());
dump($r->getInfo('debug'));

[stof]

is there any way to have a test covering this to prevent regressions ?

[nicolas-grekas]

I won't be able to add a test covering that because it requires an HTTPS endpoint. Of course we could add some network services, but that's going to be too time consuming to setup properly...

[nicolas-grekas]

Of course, I would gladly accept a PR that adds the test if anyone reading is up to give it a try!