Sure:

<?php
require_once '/vendor/autoload.php';

$loop = React\EventLoop\Factory::create();

$dnsResolverFactory = new React\Dns\Resolver\Factory();
$dnsResolver = $dnsResolverFactory->createCached('8.8.8.8', $loop);

$factory = new React\HttpClient\Factory();
$client = $factory->create($loop, $dnsResolver);

$request = $client->request('GET', 'http://localhost/');
$request->on('response', function ($response) {
    $response->on('data', function ($data) {
        // ...
    });
});
$request->on('error', function ($error, $response) {
    echo("Request error: $error\n");
});

$request->end();

$loop->run();

Gives (Windows):

Request error: exception 'React\Dns\RecordNotFoundException' with message 'DNS Request did not return valid answer.' in
C:\vendor\react\react\src\Dns\Resolver\Resolver.php:40Stack trace:
#0 C:\vendor\react\react\src\Dns\Resolver\Resolver.php(28): React\Dns\Resolver\Resolver->extractAddress(Object(React\Dns\Query\Query), Object(React\Dns\Model\Message))
#1 C:\vendor\react\promise\src\FulfilledPromise.php(24): React\Dns\Resolver\Resolver->React\Dns\Resolver\{closure}(Object(React\Dns\Model\Message))
#2 C:\vendor\react\promise\src\Promise.php(69): React\Promise\FulfilledPromise->then(Object(Closure), NULL)
#3 C:\vendor\react\promise\src\Promise.php(109): React\Promise\Promise->React\Promise\{closure}(Object(React\Promise\FulfilledPromise))
#4 C:\vendor\react\promise\src\Promise.php(83): React\Promise\Promise->settle(Object(React\Promise\FulfilledPromise))
#5 C:\vendor\react\promise\src\Promise.php(122): React\Promise\Promise->resolve(Object(React\Dns\Model\Message))
#6 C:\vendor\react\promise\src\FulfilledPromise.php(24): React\Promise\Promise->React\Promise\{closure}(Object(React\Dns\Model\Message))
#7 C:\vendor\react\promise\src\Promise.php(70): React\Promise\FulfilledPromise->then(Object(Closure), Object(Closure), Object(Closure))
#8 C:\vendor\react\promise\src\Promise.php(109): React\Promise\Promise->React\Promise\{closure}(Object(React\Promise\FulfilledPromise))
#9 C:\vendor\react\promise\src\Promise.php(83): React\Promise\Promise->settle(Object(React\Promise\FulfilledPromise))
#10 C:\vendor\react\promise\src\Promise.php(122): React\Promise\Promise->resolve(Object(React\Dns\Model\Message))
#11 [internal function]: React\Promise\Promise->React\Promise\{closure}(Object(React\Dns\Model\Message))
#12 C:\vendor\react\promise\src\Deferred.php(35): call_user_func(Object(Closure), Object(React\Dns\Model\Message))
#13 C:\vendor\react\promise\src\FulfilledPromise.php(24): React\Promise\Deferred->resolve(Object(React\Dns\Model\Message))
#14 C:\vendor\react\promise\src\Promise.php(69): React\Promise\FulfilledPromise->then(Array, Object(Closure))
#15 C:\vendor\react\promise\src\Promise.php(109): React\Promise\Promise->React\Promise\{closure}(Object(React\Promise\FulfilledPromise))
#16 C:\vendor\react\promise\src\Promise.php(83): React\Promise\Promise->settle(Object(React\Promise\FulfilledPromise))
#17 C:\vendor\react\promise\src\Promise.php(122): React\Promise\Promise->resolve(Object(React\Dns\Model\Message))
#18 [internal function]: React\Promise\Promise->React\Promise\{closure}(Object(React\Dns\Model\Message))
#19 C:\vendor\react\promise\src\Deferred.php(35): call_user_func(Object(Closure), Object(React\Dns\Model\Message))
#20 C:\vendor\react\react\src\Dns\Query\Executor.php(88): React\Promise\Deferred->resolve(Object(React\Dns\Model\Message))
#21 [internal function]: React\Dns\Query\Executor->React\Dns\Query\{closure}('\xDB\xF1\x81\x83\x00\x01\x00\x00\x00\x01\x00\x00\tlo...', Object(React\Socket\Connection))
#22 C:\vendor\evenement\evenement\src\Evenement\EventEmitterTrait.php(64): call_user_func_array(Object(Closure), Array)
#23 C:\vendor\react\react\src\Socket\Connection.php(15): Evenement\EventEmitter->emit('data', Array)
#24 [internal function]: React\Socket\Connection->handleData(Resource id #53, Object(React\EventLoop\StreamSelectLoop))
#25 C:\vendor\react\react\src\EventLoop\StreamSelectLoop.php(227): call_user_func(Array, Resource id #53, Object(React\EventLoop\StreamSelectLoop))
#26 C:\vendor\react\react\src\EventLoop\StreamSelectLoop.php(201): React\EventLoop\StreamSelectLoop->waitForStreamActivity(4980999.9465942)
#27 C:\test.php(25): React\EventLoop\StreamSelectLoop->run()
#28 {main}
Next exception 'RuntimeException' with message 'An error occurred in the underlying stream' in C:\vendor\react\react\src\HttpClient\Request.php:162Stack trace:
#0 C:\vendor\react\promise\src\RejectedPromise.php(25): React\HttpClient\Request->handleError(Object(React\Dns\RecordNotFoundException))
#1 C:\vendor\react\promise\src\Promise.php(69): React\Promise\RejectedPromise->then(Object(Closure), Array)
#2 C:\vendor\react\promise\src\Promise.php(109): React\Promise\Promise->React\Promise\{closure}(Object(React\Promise\RejectedPromise))
#3 C:\vendor\react\promise\src\Promise.php(92): React\Promise\Promise->settle(Object(React\Promise\RejectedPromise))
#4 C:\vendor\react\promise\src\Promise.php(125): React\Promise\Promise->reject(Object(React\Dns\RecordNotFoundException))
#5 C:\vendor\react\promise\src\RejectedPromise.php(25): React\Promise\Promise->React\Promise\{closure}(Object(React\Dns\RecordNotFoundException))
#6 C:\vendor\react\promise\src\Promise.php(70): React\Promise\RejectedPromise->then(Object(Closure), Object(Closure), Object(Closure))
#7 C:\vendor\react\promise\src\Promise.php(109): React\Promise\Promise->React\Promise\{closure}(Object(React\Promise\RejectedPromise))
#8 C:\vendor\react\promise\src\Promise.php(92): React\Promise\Promise->settle(Object(React\Promise\RejectedPromise))
#9 C:\vendor\react\promise\src\Promise.php(125): React\Promise\Promise->reject(Object(React\Dns\RecordNotFoundException))
#10 C:\vendor\react\promise\src\RejectedPromise.php(25): React\Promise\Promise->React\Promise\{closure}(Object(React\Dns\RecordNotFoundException))
#11 C:\vendor\react\promise\src\Promise.php(70): React\Promise\RejectedPromise->then(Object(Closure), Object(Closure), Object(Closure))
#12 C:\vendor\react\promise\src\Promise.php(109): React\Promise\Promise->React\Promise\{closure}(Object(React\Promise\FulfilledPromise))
#13 C:\vendor\react\promise\src\Promise.php(83): React\Promise\Promise->settle(Object(React\Promise\FulfilledPromise))
#14 C:\vendor\react\promise\src\Promise.php(122): React\Promise\Promise->resolve(Object(React\Dns\Model\Message))
#15 C:\vendor\react\promise\src\FulfilledPromise.php(24): React\Promise\Promise->React\Promise\{closure}(Object(React\Dns\Model\Message))
#16 C:\vendor\react\promise\src\Promise.php(70): React\Promise\FulfilledPromise->then(Object(Closure), Object(Closure), Object(Closure))
#17 C:\vendor\react\promise\src\Promise.php(109): React\Promise\Promise->React\Promise\{closure}(Object(React\Promise\FulfilledPromise))
#18 C:\vendor\react\promise\src\Promise.php(83): React\Promise\Promise->settle(Object(React\Promise\FulfilledPromise))
#19 C:\vendor\react\promise\src\Promise.php(122): React\Promise\Promise->resolve(Object(React\Dns\Model\Message))
#20 [internal function]: React\Promise\Promise->React\Promise\{closure}(Object(React\Dns\Model\Message))
#21 C:\vendor\react\promise\src\Deferred.php(35): call_user_func(Object(Closure), Object(React\Dns\Model\Message))
#22 C:\vendor\react\promise\src\FulfilledPromise.php(24): React\Promise\Deferred->resolve(Object(React\Dns\Model\Message))
#23 C:\vendor\react\promise\src\Promise.php(69): React\Promise\FulfilledPromise->then(Array, Object(Closure))
#24 C:\vendor\react\promise\src\Promise.php(109): React\Promise\Promise->React\Promise\{closure}(Object(React\Promise\FulfilledPromise))
#25 C:\vendor\react\promise\src\Promise.php(83): React\Promise\Promise->settle(Object(React\Promise\FulfilledPromise))
#26 C:\vendor\react\promise\src\Promise.php(122): React\Promise\Promise->resolve(Object(React\Dns\Model\Message))
#27 [internal function]: React\Promise\Promise->React\Promise\{closure}(Object(React\Dns\Model\Message))
#28 C:\vendor\react\promise\src\Deferred.php(35): call_user_func(Object(Closure), Object(React\Dns\Model\Message))
#29 C:\vendor\react\react\src\Dns\Query\Executor.php(88): React\Promise\Deferred->resolve(Object(React\Dns\Model\Message))
#30 [internal function]: React\Dns\Query\Executor->React\Dns\Query\{closure}('\xDB\xF1\x81\x83\x00\x01\x00\x00\x00\x01\x00\x00\tlo...', Object(React\Socket\Connection))
#31 C:\vendor\evenement\evenement\src\Evenement\EventEmitterTrait.php(64): call_user_func_array(Object(Closure), Array)
#32 C:\vendor\react\react\src\Socket\Connection.php(15): Evenement\EventEmitter->emit('data', Array)
#33 [internal function]: React\Socket\Connection->handleData(Resource id #53, Object(React\EventLoop\StreamSelectLoop))
#34 C:\vendor\react\react\src\EventLoop\StreamSelectLoop.php(227): call_user_func(Array, Resource id #53, Object(React\EventLoop\StreamSelectLoop))
#35 C:\vendor\react\react\src\EventLoop\StreamSelectLoop.php(201): React\EventLoop\StreamSelectLoop->waitForStreamActivity(4980999.9465942)
#36 C:\test.php(25): React\EventLoop\StreamSelectLoop->run()
#37 {main}

Either the DNSresolver should honor the hosts file or the client should not pass local requests to the DNS resolver- dunno which is better...

Requests to localhost are handed to DNS resolver #11

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