diff --git a/README.md b/README.md
index fe20e32..190e186 100644
--- a/README.md
+++ b/README.md
@@ -288,7 +288,7 @@ private key on command line.
     - [x] `NOTICE` - used to send human-readable messages (like errors) to clients
 - [x] Improve handling relay responses
 - [ ] Support NIP-19 bech32-encoded identifiers
-- [ ] Support NIP-42 authentication of clients to relays => AUTH relay response
+- [x] Support NIP-42 authentication of clients to relays
 - [ ] Support NIP-45 event counts
 - [ ] Support NIP-50 search capability
 - [ ] Support multi-threading (async concurrency) for handling requests simultaneously
diff --git a/src/Examples/request-events-from-multiple-relays.php b/src/Examples/request-events-from-multiple-relays.php
index af499ba..4e653ef 100644
--- a/src/Examples/request-events-from-multiple-relays.php
+++ b/src/Examples/request-events-from-multiple-relays.php
@@ -42,7 +42,7 @@
     $response = $request->send();
 
     foreach ($response as $relayUrl => $relayResponses) {
-        print 'Received ' . count($response[$relayUrl]) . ' message(s) found from relay ' . $relayUrl . PHP_EOL;
+        print 'Received ' . count($response[$relayUrl]) . ' message(s) received from relay ' . $relayUrl . PHP_EOL;
         foreach ($relayResponses as $message) {
             print $message->event->content . PHP_EOL;
         }
diff --git a/src/Examples/request-events-with-auth.php b/src/Examples/request-events-with-auth.php
new file mode 100644
index 0000000..8da60ac
--- /dev/null
+++ b/src/Examples/request-events-with-auth.php
@@ -0,0 +1,53 @@
+<?php
+
+declare(strict_types=1);
+
+use swentel\nostr\Event\Event;
+use swentel\nostr\Filter\Filter;
+use swentel\nostr\Message\RequestMessage;
+use swentel\nostr\Relay\Relay;
+use swentel\nostr\RelayResponse\RelayResponseEvent;
+use swentel\nostr\Request\Request;
+use swentel\nostr\Subscription\Subscription;
+
+require __DIR__ . '/../../vendor/autoload.php';
+
+try {
+    $subscription = new Subscription();
+    $subscriptionId = $subscription->setId();
+    $filter1 = new Filter();
+    $filter1->setAuthors([
+        'npub1qe3e5wrvnsgpggtkytxteaqfprz0rgxr8c3l34kk3a9t7e2l3acslezefe',
+    ]);
+    $filter1->setKinds([1]);
+    $filter1->setLimit(3);
+    $filters = [$filter1];
+    $requestMessage = new RequestMessage($subscriptionId, $filters);
+    $relay = new Relay('wss://jingle.nostrver.se');
+    //$relay = new Relay('wss://hotrightnow.nostr1.com');
+    $request = new Request($relay, $requestMessage);
+    $response = $request->send();
+
+    foreach ($response as $relay => $messages) {
+        print 'Received ' . count($response[$relay]) . ' message(s) received from relay ' . $relay . PHP_EOL;
+        foreach ($messages as $message) {
+            print $message->type . ': ' . $message->message . PHP_EOL;
+            if ($message instanceof RelayResponseEvent) {
+                $rawEvent = $message->event;
+                $event = new Event();
+                $event->setId($rawEvent->id);
+                $event->setPublicKey($rawEvent->pubkey);
+                $event->setCreatedAt($rawEvent->created_at);
+                $event->setKind($rawEvent->kind);
+                $event->setTags($rawEvent->tags);
+                $event->setContent($rawEvent->content);
+                $event->setSignature($rawEvent->sig);
+                if ($event->verify() === true) {
+                    var_dump($event->getContent());
+                }
+            }
+        }
+    }
+} catch (Exception $e) {
+    print $e->getMessage() . PHP_EOL;
+}
diff --git a/src/Examples/request-events.php b/src/Examples/request-events.php
index 838b6e8..b560a5b 100644
--- a/src/Examples/request-events.php
+++ b/src/Examples/request-events.php
@@ -31,10 +31,12 @@
      *   Each message will also contain the event.
      */
     foreach ($response as $relayUrl => $relayResponses) {
-        print 'Received ' . count($response[$relayUrl]) . ' message(s) found from relay ' . $relayUrl . PHP_EOL;
+        print 'Received ' . count($response[$relayUrl]) . ' message(s) received from relay ' . $relayUrl . PHP_EOL;
         /** @var \swentel\nostr\RelayResponse\RelayResponseEvent $message */
         foreach ($relayResponses as $message) {
-            print $message->event->content . PHP_EOL;
+            if (isset($message->event->content)) {
+                print $message->event->content . PHP_EOL;
+            }
         }
     }
 } catch (Exception $e) {
diff --git a/src/Message/AuthMessage.php b/src/Message/AuthMessage.php
new file mode 100644
index 0000000..a056a10
--- /dev/null
+++ b/src/Message/AuthMessage.php
@@ -0,0 +1,49 @@
+<?php
+
+declare(strict_types=1);
+
+namespace swentel\nostr\Message;
+
+use swentel\nostr\EventInterface;
+use swentel\nostr\MessageInterface;
+
+class AuthMessage implements MessageInterface
+{
+    /**
+     * @var string $type
+     */
+    private string $type;
+
+    /**
+     * The event.
+     *
+     * @var EventInterface
+     */
+    protected EventInterface $event;
+
+    public function __construct(EventInterface $event)
+    {
+        $this->event = $event;
+        $this->setType(MessageTypeEnum::AUTH);
+    }
+
+    /**
+     * Set message type.
+     *
+     * @param MessageTypeEnum $type
+     * @return void
+     */
+    public function setType(MessageTypeEnum $type): void
+    {
+        $this->type = $type->value;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function generate(): string
+    {
+        $event = json_encode($this->event->toArray(), JSON_UNESCAPED_SLASHES | JSON_UNESCAPED_UNICODE);
+        return '["' . $this->type . '", ' . $event . ']';
+    }
+}
diff --git a/src/Message/MessageTypeEnum.php b/src/Message/MessageTypeEnum.php
index 97b59cb..7e74a96 100644
--- a/src/Message/MessageTypeEnum.php
+++ b/src/Message/MessageTypeEnum.php
@@ -12,4 +12,5 @@ enum MessageTypeEnum: string
     case EVENT = 'EVENT';
     case REQUEST = 'REQ';
     case CLOSE = 'CLOSE';
+    case AUTH = 'AUTH';
 }
diff --git a/src/Nip42/AuthEvent.php b/src/Nip42/AuthEvent.php
new file mode 100644
index 0000000..eb92e7e
--- /dev/null
+++ b/src/Nip42/AuthEvent.php
@@ -0,0 +1,33 @@
+<?php
+
+declare(strict_types=1);
+
+namespace swentel\nostr\Nip42;
+
+use swentel\nostr\Event\Event;
+
+/**
+ * NIP-42: https://github.com/nostr-protocol/nips/blob/master/42.md
+ * AuthEvent class for canonical authentication event.
+ */
+class AuthEvent extends Event
+{
+    /**
+     * Event kind for canonical authentication event sent to the relay.
+     *
+     * @var int
+     */
+    protected int $kind = 22242;
+
+    /**
+     * Base constructor for AuthEvent.
+     */
+    public function __construct($relayUri, $challenge)
+    {
+        parent::__construct();
+        $this->setTags([
+            ['relay', $relayUri],
+            ['challenge', $challenge],
+        ]);
+    }
+}
diff --git a/src/Request/Request.php b/src/Request/Request.php
index 10323f3..737cbee 100644
--- a/src/Request/Request.php
+++ b/src/Request/Request.php
@@ -4,11 +4,18 @@
 
 namespace swentel\nostr\Request;
 
+use swentel\nostr\Event\Event;
+use swentel\nostr\Message\AuthMessage;
+use swentel\nostr\Nip42\AuthEvent;
 use swentel\nostr\Relay\Relay;
 use swentel\nostr\Relay\RelaySet;
 use swentel\nostr\RelayResponse\RelayResponse;
 use swentel\nostr\RequestInterface;
+use swentel\nostr\Sign\Sign;
 use WebSocket;
+use WebSocket\Client;
+use WebSocket\Connection;
+use WebSocket\Message\Text;
 
 class Request implements RequestInterface
 {
@@ -26,6 +33,13 @@ class Request implements RequestInterface
      */
     private string $payload;
 
+    /**
+     * Array with all responses received from the relay.
+     *
+     * @var array
+     */
+    protected array $responses;
+
     /**
      * Constructor for the Request class.
      * Initializes the url and payload properties based on the provided websocket and message.
@@ -71,7 +85,8 @@ public function send(): array
      * Method to send a request using WebSocket client, receive responses, and handle errors.
      *
      * @param Relay $relay
-     * @return array
+     * @return array|RelayResponse
+     * @throws \Throwable
      */
     private function getResponseFromRelay(Relay $relay): array | RelayResponse
     {
@@ -86,9 +101,9 @@ private function getResponseFromRelay(Relay $relay): array | RelayResponse
          *    connection is still alive, but it does not confirm the closure of the subscription)
          */
 
-        $client = new WebSocket\Client($relay->getUrl());
+        $client = new Client($relay->getUrl());
+        $client->setTimeout(60);
         $client->text($this->payload);
-        $result = [];
 
         while ($response = $client->receive()) {
             if ($response === null) {
@@ -100,17 +115,75 @@ private function getResponseFromRelay(Relay $relay): array | RelayResponse
                 return RelayResponse::create($response);
             } elseif ($response instanceof WebSocket\Message\Ping) {
                 $client->disconnect();
-                return $result;
-            } elseif ($response instanceof WebSocket\Message\Text) {
+                return $this->responses;
+            } elseif ($response instanceof Text) {
                 $relayResponse = RelayResponse::create(json_decode($response->getContent()));
+                $this->responses[] = $relayResponse;
                 if ($relayResponse->type === 'EOSE') {
+                    $client->disconnect();
                     break;
                 }
-
-                $result[] = $relayResponse;
+                if ($relayResponse->type === 'OK' && $relayResponse->status === false) {
+                    $client->disconnect();
+                    throw new \Exception($relayResponse->message);
+                }
+                // NIP-42
+                if ($relayResponse->type === 'AUTH') {
+                    // Save challenge string in session.
+                    $_SESSION['challenge'] = $relayResponse->message;
+                }
+                if ($relayResponse->type === 'CLOSED') {
+                    // NIP-42
+                    // We do need to broadcast a signed event verification here to the relay.
+                    if (str_starts_with($relayResponse->message, 'auth-required:')) {
+                        if (!isset($_SESSION['challenge'])) {
+                            $client->disconnect();
+                            throw new \Exception('No challenge set in $_SESSION');
+                        }
+                        $aa = new AuthEvent($relay->getUrl(), $_SESSION['challenge']);
+                        $authEvent = new Event();
+                        $authEvent->setKind(22242);
+                        $authEvent->setTags([
+                            ['relay', $relay->getUrl()],
+                            ['challenge', $_SESSION['challenge']],
+                        ]);
+                        $sec = '0000000000000000000000000000000000000000000000000000000000000001';
+                        // todo: use client defined secret key here instead of this default one
+                        $signer = new Sign();
+                        $signer->signEvent($aa, $sec);
+                        $authMessage = new AuthMessage($aa);
+                        $initialMessage = $this->payload;
+                        $this->payload = $authMessage->generate();
+                        $client->text($this->payload);
+                        // Set listener.
+                        $client->onText(function (Client $client, Connection $connection, Text $message) {
+                            $this->responses[] = RelayResponse::create(json_decode($message->getContent()));
+                            $client->stop();
+                        })->start();
+                        // Broadcast the initial message to the relay now the AUTH is done.
+                        $this->payload = $initialMessage;
+                        $client->text($this->payload);
+                        $client->onText(function (Client $client, Connection $connection, Text $message) {
+                            /** @var RelayResponse $response */
+                            $response = RelayResponse::create(json_decode($message->getContent()));
+                            $this->responses[] = $response;
+                            if ($response->type === 'EOSE') {
+                                $client->disconnect();
+                            }
+                        })->start();
+                        break;
+                    }
+                    if (str_starts_with($relayResponse->message, 'restricted:')) {
+                        // For when a client has already performed AUTH but the key used to perform
+                        // it is still not allowed by the relay or is exceeding its authorization.
+                        $client->disconnect();
+                        throw new \Exception($relayResponse->message);
+                    }
+                }
             }
         }
         $client->disconnect();
-        return $result;
+        $client->close();
+        return $this->responses;
     }
 }
diff --git a/tests/RelayResponseTest.php b/tests/RelayResponseTest.php
index 4a32449..5b24fe5 100644
--- a/tests/RelayResponseTest.php
+++ b/tests/RelayResponseTest.php
@@ -7,6 +7,8 @@
 use swentel\nostr\Message\RequestMessage;
 use swentel\nostr\Relay\Relay;
 use swentel\nostr\RelayResponse\RelayResponseAuth;
+use swentel\nostr\RelayResponse\RelayResponseClosed;
+use swentel\nostr\RelayResponse\RelayResponseOk;
 use swentel\nostr\Request\Request;
 use swentel\nostr\Subscription\Subscription;
 
@@ -14,7 +16,7 @@ class RelayResponseTest extends TestCase
 {
     public function testSendRequestToRelayAndResultAuth()
     {
-        $relayUrl = 'wss://nostr.sebastix.social';
+        $relayUrl = 'wss://jingle.nostrver.se';
 
         $relay = new Relay($relayUrl);
 
@@ -33,5 +35,7 @@ public function testSendRequestToRelayAndResultAuth()
         $result = $request->send();
 
         $this->assertInstanceOf(RelayResponseAuth::class, $result[$relayUrl][0]);
+        $this->assertInstanceOf(RelayResponseClosed::class, $result[$relayUrl][1]);
+        $this->assertInstanceOf(RelayResponseOk::class, $result[$relayUrl][2]);
     }
 }