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4.x is outdated, please check the latest version 22.x
Latest version:
pecl install openswoole-22.1.2
<?php Swoole\Coroutine\Http\Client->getHeaderOut(): string|bool
None
A string of plain-text headers or false if something went wrong.
Get the HTTP request headers as plain text that were sent to the remote server.
<?php
use Swoole\Coroutine\HTTP\Client;
Co\run(function()
{
$client = new Client('127.0.0.1', 80);
$client->setHeaders([
'Host' => "localhost",
"User-Agent" => 'Chrome/49.0.2587.3',
'Accept' => 'text/html,application/xhtml+xml,application/xml',
'Accept-Encoding' => 'gzip',
]);
$client->set(['timeout' => 1]);
$client->setDefer(true);
$client->get('/index.php');
var_dump($client->getHeaderOut());
$client->close();
});