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Symfony HttpClient Async example
<?php
$client = \Symfony\Component\HttpClient\HttpClient::create();
// Create a few requests: this is entierely async, requests are launched in the background
$request1 = $client->request('GET', 'http://releases.ubuntu.com/18.04.2/ubuntu-18.04.2-desktop-amd64.iso?request=a');
$request2 = $client->request('GET', 'http://releases.ubuntu.com/18.04.2/ubuntu-18.04.2-desktop-amd64.iso?request=b');
$request3 = $client->request('GET', 'http://releases.ubuntu.com/18.04.2/ubuntu-18.04.2-desktop-amd64.iso?request=c');
// The code continues execution immediatly, you can do whathever you want here ...
// Now if you call getContent or getStatusCode on one of the requests, you will get a blocking wait
// for this specific request: $request1->getContent(); would only wait for request 1, if request 2 & 3
// take mucher longer we wouldn't wait for them now.
// But to achieve real async, you can go even further and use stream():
// Infinite loop, for instance an event-loop
while (true) {
// Create an iterable stream for all the requests
// A timeout of 0 means don't wait any requests and give me only the responses chunks which are ready right now
$stream = $client->stream([$request1, $request2, $request3], 0);
foreach ($stream as $response => $chunk) {
if ($chunk->isTimeout()) {
echo 'Chunk received from response '.$response->getInfo('url')."\n";
}
}
// Chunking with stream() also means support for HTTP2 push out of the box
// Code here will be executed regularly, between the chunks arriving in the background ...
}
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