How can I add custom stream context options?

You can pass custom stream context options using the stream_context key of the request option. The stream_context array is an associative array where each key is a PHP transport, and each value is an associative array of transport options.

For example, let’s say you need to customize the outgoing network interface used with a client and allow self-signed certificates.

$client->request('GET', '/', [
    'stream' => true,
    'stream_context' => [
        'ssl' => [
            'allow_self_signed' => true
        ],
        'socket' => [
            'bindto' => 'xxx.xxx.xxx.xxx'
        ]
    ]
]);