diff --git a/src/JsonLd/Dereferencer/CachingDereferencer.php b/src/JsonLd/Dereferencer/CachingDereferencer.php
index b6e1933..73fd2c0 100644
--- a/src/JsonLd/Dereferencer/CachingDereferencer.php
+++ b/src/JsonLd/Dereferencer/CachingDereferencer.php
@@ -4,6 +4,7 @@ namespace ActivityPub\JsonLd\Dereferencer;
 
 use ActivityPub\Crypto\HttpSignatureService;
 use ActivityPub\JsonLd\Exceptions\NodeNotFoundException;
+use ActivityPub\Utils\DateTimeProvider;
 use ActivityPub\Utils\Util;
 use DateTime;
 use DateTimeZone;
@@ -44,6 +45,11 @@ class CachingDereferencer implements DereferencerInterface
      */
     private $httpSignatureService;
 
+    /**
+     * @var DateTimeProvider
+     */
+    private $dateTimeProvider;
+
     /**
      * The keyId for signing requests, if there is one.
      * @var null|string
@@ -58,9 +64,11 @@ class CachingDereferencer implements DereferencerInterface
 
     /**
      * CachingDereferencer constructor.
+     * @param LoggerInterface $logger
      * @param CacheItemPoolInterface $cache
      * @param Client $httpClient
      * @param HttpSignatureService $httpSignatureService
+     * @param DateTimeProvider $dateTimeProvider
      * @param null|string $keyId
      * @param null|string $privateKey
      */
@@ -68,6 +76,7 @@ class CachingDereferencer implements DereferencerInterface
                                  CacheItemPoolInterface $cache,
                                  Client $httpClient,
                                  HttpSignatureService $httpSignatureService,
+                                 DateTimeProvider $dateTimeProvider,
                                  $keyId = null,
                                  $privateKey = null )
     {
@@ -75,6 +84,7 @@ class CachingDereferencer implements DereferencerInterface
         $this->cache = $cache;
         $this->httpClient = $httpClient;
         $this->httpSignatureService = $httpSignatureService;
+        $this->dateTimeProvider = $dateTimeProvider;
         $this->keyId = $keyId;
         $this->privateKey = $privateKey;
     }
@@ -113,7 +123,7 @@ class CachingDereferencer implements DereferencerInterface
                 $signature = $this->httpSignatureService->sign( $request, $this->privateKey, $this->keyId );
                 $request = $request->withHeader( 'Signature', $signature );
             }
-            $response = $this->httpClient->send( $request );
+            $response = $this->httpClient->send( $request, array( 'http_errors' => false ) );
             if ( $response->getStatusCode() >= 400 ) {
                 $statusCode = $response->getStatusCode();
                 $this->logger->error(
@@ -154,7 +164,8 @@ class CachingDereferencer implements DereferencerInterface
 
     private function getNowRFC1123()
     {
-        $now = new DateTime( 'now', new DateTimeZone( 'GMT' ) );
+        $now = $this->dateTimeProvider->getTime( 'caching-dereferencer.dereference' );
+        $now->setTimezone( new DateTimeZone( 'GMT' ) );
         return $now->format( 'D, d M Y H:i:s T' );
     }
 }
\ No newline at end of file
diff --git a/test/JsonLd/Dereferencer/CachingDereferencerTest.php b/test/JsonLd/Dereferencer/CachingDereferencerTest.php
new file mode 100644
index 0000000..727ceee
--- /dev/null
+++ b/test/JsonLd/Dereferencer/CachingDereferencerTest.php
@@ -0,0 +1,141 @@
+<?php
+
+namespace ActivityPub\Test\JsonLd\Dereferencer;
+
+use ActivityPub\Crypto\HttpSignatureService;
+use ActivityPub\JsonLd\Dereferencer\CachingDereferencer;
+use ActivityPub\Test\TestConfig\APTestCase;
+use ActivityPub\Test\TestUtils\TestDateTimeProvider;
+use ActivityPub\Utils\Logger;
+use Cache\Adapter\PHPArray\ArrayCachePool;
+use DateTime;
+use GuzzleHttp\Client;
+use GuzzleHttp\Handler\MockHandler;
+use GuzzleHttp\HandlerStack;
+use GuzzleHttp\Middleware;
+use GuzzleHttp\Psr7\Request;
+use GuzzleHttp\Psr7\Response;
+
+class CachingDereferencerTest extends APTestCase
+{
+    public function provideForItCaches()
+    {
+        return array(
+            array(
+                'https://example.com/sally',
+                (object) array(
+                    'id' => 'https://example.com/sally',
+                    'type' => 'Person',
+                ),
+                array(
+                    new Request(
+                        'GET',
+                        'https://example.com/sally',
+                        array(
+                            'Host' => 'example.com',
+                            'Accept' => 'application/ld+json',
+                            'Date' => 'Sun, 05 Jan 2014 21:31:40 GMT',
+                        )
+                    ),
+                ),
+                array(
+                    new Response( 200, array(), json_encode(
+                        (object) array(
+                            'id' => 'https://example.com/sally',
+                            'type' => 'Person',
+                        )
+                    )),
+                ),
+            ),
+            array(
+                'https://example.com/sally',
+                (object) array(
+                    'id' => 'https://example.com/sally',
+                    'type' => 'Person',
+                ),
+                array(
+                    new Request(
+                        'GET',
+                        'https://example.com/sally',
+                        array(
+                            'Host' => 'example.com',
+                            'Accept' => 'application/ld+json',
+                            'Date' => 'Sun, 05 Jan 2014 21:31:40 GMT',
+                            'Signature' => 'keyId="Test",algorithm="rsa-sha256",headers="(request-target) host date",signature="PXfYgMWE1CpS7DDuo8iB7Sj3qCBuN8bDuND3mQBU06rh7EMfWqisB0USH0DWFbZVcbsHr/YnKJlcmbWG5mpU6Kf0B4SAoMKGHCUNT1i55uw5XLPSZfrd2c38md2Pv8Dt0lO7cFP8SeiTlBM3gTmpvnuKn+AxpR9jpvwAQT8riQw="',
+                        )
+                    ),
+                ),
+                array(
+                    new Response( 200, array(), json_encode(
+                        (object) array(
+                            'id' => 'https://example.com/sally',
+                            'type' => 'Person',
+                        )
+                    )),
+                ),
+                'Test',
+                "-----BEGIN RSA PRIVATE KEY-----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+-----END RSA PRIVATE KEY-----",
+            ),
+        );
+    }
+
+    /**
+     * @dataProvider provideForItCaches
+     */
+    public function testItCaches( $iri,
+                                  $expectedJsonObj,
+                                  $expectedRequestHistory = array(),
+                                  $mockResponses = array(),
+                                  $keyId = null,
+                                  $privateKey = null )
+    {
+        $logger = new Logger();
+        $cache = new ArrayCachePool();
+        $dateTimeProvider = new TestDateTimeProvider( array (
+            'caching-dereferencer.dereference' => DateTime::createFromFormat(
+                DateTime::RFC2822, 'Sun, 05 Jan 2014 21:31:40 GMT'
+            ),
+        ) );
+        $sigService = new HttpSignatureService( $dateTimeProvider );
+
+        $mock = new MockHandler( $mockResponses );
+        $handler = HandlerStack::create( $mock );
+        $historyContainer = array();
+        $history = Middleware::history( $historyContainer );
+        $handler->push( $history );
+        $client = new Client( array( 'handler' => $handler ) );
+
+        $dereferencer = new CachingDereferencer(
+            $logger, $cache, $client, $sigService, $dateTimeProvider, $keyId, $privateKey
+        );
+
+        $jsonObj = $dereferencer->dereference( $iri );
+        $this->assertEquals( $expectedJsonObj, $jsonObj );
+
+        $cachedObj = $dereferencer->dereference( $iri );
+        $this->assertEquals( $expectedJsonObj, $cachedObj );
+
+        $this->assertEquals( count( $expectedRequestHistory ), count( $historyContainer ) );
+        for ( $i = 0; $i < count( $expectedRequestHistory ); $i += 1 ) {
+            $expectedRequest = $expectedRequestHistory[$i];
+            $actualRequest = $historyContainer[$i]['request'];
+            foreach ( $expectedRequest->getHeaders() as $name => $expectedHeaders ) {
+                $this->assertEquals( $expectedHeaders, $actualRequest->getHeader( $name ) );
+            }
+        }
+    }
+}
\ No newline at end of file