Multiple clients (handlers, in reality) not working asynchronously

[XbNz]

Guzzle v7.4.2

Takes 20+ seconds:

foreach(range(1, 10) as $request) {
  $stack = HandlerStack::create();
  $client = new Client(['handler' => $stack]);
  $promises[] = $client->getAsync('https://httpbin.org/delay/2');
}

Utils::all($promises)->wait()

Takes 3 seconds:

$stack = HandlerStack::create();

foreach(range(1, 10) as $request) {
  $client = new Client(['handler' => $stack]);
  $promises[] = $client->getAsync('https://httpbin.org/delay/2');
}

Utils::all($promises)->wait()

I need to process promises produced by various clients with different handler stacks. I have middleware in these stacks that perform auth, etc... So I cannot get away with using 1 stack and 1 client to fulfill every promise. But as you see in the code snippet above, it's not behaving as expected.

I copied your example here line by line into Tinkerwell, and it's also not behaving as expected.

I can always solve the problem with Spatie's Fork, but I've had bad compatibility experiences with it not working on some fpm environments. It's a package that I'm creating, so I'd like to stay as close to native Guzzle as possible.

Let me know if you have anything in mind. If you think it's a bug, I can always open an issue over on Guzzle.