reproducer for symfony/symfony#30753

composer.json

{
    "require": {
        "symfony/http-client": "^4.3@dev"
    },
    "require-dev": {
        "symfony/var-dumper": "^4.3@dev"
    },
    "minimum-stability": "dev"
}

reproducer.php

<?php declare(strict_types=1);

use Symfony\Component\HttpClient\HttpClient;

require __DIR__ . '/vendor/autoload.php';

$client = HttpClient::create();
$r = $client->request(
    'POST',
    'http://localhost:8081',
    [
        'auth_bearer' => 'foobaba',
        'headers' => [
            'Content-Type' => 'application/json',
        ],
        'body' => json_encode(['foo' => 'bar']),
    ]
);

if ($argv[1] ?? false) {
    dump($r->getStatusCode());
}

server.php

<?php
header('Content-Type: application/json+ld');

header("HTTP/1.1 500 Internal Server Error");

echo <<<JSON
[
 {
   "foo": "bar"
 },

 {
   "foo": {"baz": "baz"}
 },

 {
   "foo": [1, 2, 3]
 }
]
JSON;

How to use ;

• composer install
• launch php -S localhost:8081 server.php
• launch php reproducer.php, it should throw the failed writing headers from the TransportException
• launch php reproducer.php foo, it should dump 500.