Promise adapter usage

Optional requirements

Optional to use Guzzle:

composer require "guzzlehttp/promises"

Optional to use ReactPhp:

composer require "react/promise"

Supported Adapter

Guzzle: Overblog\PromiseAdapter\Adapter\GuzzleHttpPromiseAdapter

ReactPhp: Overblog\PromiseAdapter\Adapter\ReactPromiseAdapter

To use a custom Promise lib you can implement Overblog\PromiseAdapter\PromiseAdapterInterface