Strange behavior of http client

Yii 2.0 General Discussions
1

Hello there.
I am trying to request web page by POST via yii\httpclient\Client
(Currently page I request belong to same site I sending request from, but it will change later)
How it should work: I send AJAX POST to page /api/request-acceptor-open, script on that page sends POST with some data to /api/c-request-acceptor-open

Yii is running as Test Server ( yii serve from folder @app/tests/bin)
How I create request:

$client = new Client([
    'baseUrl' => $addressToSend,
    'requestConfig' => ['format' => Client::FORMAT_JSON],
    'responseConfig' => ['format' => Client::FORMAT_JSON]
]);

$response = $client->createRequest()
        ->addHeaders(['content-type' => 'application/json'])
        ->setOptions([
            'timeout' => \Yii::$app->params['httpTimeout'] ?? 10, 
        ])
        ->setMethod('POST')
        ->setContent( json_encode($data) )
        ->send();

When I run this code as it should be,

$addressToSend = 'http://localhost:8080/api/c-request-acceptor-open'

, i receive error

"Cannot send confirmation: fopen(http://localhost:8080/api/c-request-acceptor-open): failed to open stream: HTTP request failed!"

Without timeout restricitions

Operation timed out after 30000 ms with 0 bytes received

Server access log looks like

[Thu Apr 15 19:32:55 2021] PHP 7.4.12 Development Server (http://localhost:8080) started
[Thu Apr 15 19:32:58 2021] 127.0.0.1:40948 Accepted
[Thu Apr 15 19:32:58 2021] 127.0.0.1:40948 [200] POST /api/request-acceptor-open
[Thu Apr 15 19:32:58 2021] 127.0.0.1:40948 Closing
[Thu Apr 15 19:32:58 2021] 127.0.0.1:40950 Accepted
[Thu Apr 15 19:33:08 2021] 127.0.0.1:40950 [200] POST /api/request-acceptor-open
[Thu Apr 15 19:33:08 2021] 127.0.0.1:40950 Closing
[Thu Apr 15 19:33:08 2021] 127.0.0.1:40952 Accepted
[Thu Apr 15 19:33:08 2021] 127.0.0.1:40952 [200] POST /api/c-request-acceptor-open
[Thu Apr 15 19:33:08 2021] 127.0.0.1:40952 Closing

(Log screenshot)

If I visit this page http://localhost:8080/api/c-request-acceptor-open via any browser, it works fine.

When I set address as test domain

$addressToSend = 'http://wash/api/c-request-acceptor-open'
OR
$addressToSend = 'http://wash:80/api/c-request-acceptor-open'

I receive correct answer and everything work ok.

Why is it happening?

Will be grateful for any help. Thank you.

2

Maybe too many requests at the same time? PHP built-in server can handle only a single request at a time.

3

Yes, looks like this.