Changing Header for Concurrent Requests (Guzzle) - php

Question

I am unable to change the request headers when making async requests.
$requests = function ($total) {
$uri = 'https://www.example.com';
$headers = [
'User-Agent' => 'testing/1.0',
'Accept' => 'application/json',
'X-Foo' => ['Bar', 'Baz']
];
for ($i = 0; $i < $total; $i++) {
yield new Request('GET', $uri, $headers); //Does not work
}
};
$pool = new Pool($client, $requests(2), [
'concurrency' => 5,
'fulfilled' => function ($response, $index) {
// this is delivered each successful response
},
'rejected' => function ($reason, $index) {
// this is delivered each failed request
},
]);
I believe I have tried all of the examples provided in the documentation and have been able to change the headers for all of them except the concurrent examples. Any help would be appreciated.

Answer 1

I may have gotten this to work, but not under the conditions that I was hoping for.
$headers = ['User-Agent' => 'Bar'];
$client = new Client(['base_uri' => 'https://www.example.com/']);
$promises = [
'image' => $client->getAsync('/page1',
['User-Agent' => "test"]
),
'png' => $client->getAsync('/page2'),
];
$results = Promise\unwrap($promises);
$results = Promise\settle($promises)->wait();
I believe this works, because in this instance I am using the Client object rather than creating my own request (as I did in the other one). I'm not entirely sure about this. So if anyone can provide any further insight, that would be helpful.