How to add authentication to GuzzleHTTP Request Objects for asynchronous processing

Question

I am creating multiple of the following GuzzleHttp\Psr7\Requests:

use GuzzleHttp\Psr7\Request;

$myRequest = new Request(
    'GET',
    $someUri
);

And save them in an array: $guzzleRequests

I then create a pool to simultaneously execute all requests:

    use GuzzleHttp\Pool;

    $testPool = new Pool($testClient = new \GuzzleHttp\Client(), $guzzlePromises,
    [
        'fulfilled' => function ($response, $index) {
            // this is delivered each successful response
            var_dump($response);
        },
        'rejected' => function ($reason, $index) {
            // this is delivered each failed request
            var_dump($reason);
        }
    ]);
    // Initiate the transfers and create a promise
    $promise = $testPool->promise();

    // Force the pool of requests to complete.
    $promise->wait();

(Taken from the Doc: http://guzzle.readthedocs.org/en/latest/quickstart.html under "Concurrent requests")

This works for requests to URIs that don't need authentication and returns a 200 OK Status.

How do I add authentication to the Request so that the Pool can run multiple requests against Basic HTTP Authorization protected APIs at the same time?

*edit 1:

In response to pinkal vansia: I added the header as you suggested:

$headers = [
    'Authorization: Basic '. base64_encode($this->username.':'.$this->password),
];
$myRequest = new Request(
    'GET',
    $url,
    $headers
);`

and dumped the headers:

array (size=2)
    'Host' => 
    array (size=1)
        0 => string '<myHost>' (length=27)
0 => 
    array (size=1)
        0 => string 'Authorization: Basic <veryLongAuthenticationString>' (length=<stringLength>)`

The response still yields unauthorized:

private 'reasonPhrase' => string 'Unauthorized' (length=12)
private 'statusCode' => int 401

* final edit:

I finally got it running. It turns out, pinkal vansia was already pretty close.

The exact form was the last problem. Michael Downling's comment brought me on the right track.

The Authorization header is the way to go and it needs to be a key => value mapping.

The final thing looks like this:

$url = $myUrl.'?'.http_build_query($this->queryArray);

// ------------ Specify Authorization => key to make it work!!!
$headers = [
    'Authorization' => 'Basic '. base64_encode($this->username.':'.$this->password)
];
// -----------------------------------------------------------

$myRequest = new Request(
    'GET',
    $url,
    $headers
);

return $myRequest;

Answer 1

You can add Basic Authentication header in Request as below

$headers = [
    'Authorization: Basic '. base64_encode($this->username.':'.$this->password)
];

$myRequest = new Request(
    'GET',
    $url,
    $headers
);

I hope this Helps.

UPDATE

As @worps pointed out header needs to be a key => value pair. so final solution is like below,

$headers = [
    'Authorization' => 'Basic '. base64_encode($this->username.':'.$this->password)
];

$myRequest = new Request(
    'GET',
     $url,
     $headers
);