diff --git a/composer.json b/composer.json
index 7a18daddb..3f8c0bef2 100644
--- a/composer.json
+++ b/composer.json
@@ -20,7 +20,7 @@
         "squizlabs/php_codesniffer": "~1.4",
         "zendframework/zendframework1": "~1.12",
         "satooshi/php-coveralls": "~1.0",
-        "guzzlehttp/guzzle": "^3.8"
+        "guzzlehttp/guzzle": "^3.8 || ^6.2"
     },
     "suggest": {
         "minimalcode/search": "Query builder compatible with Solarium, allows simplified solr-query handling"
diff --git a/library/Solarium/Core/Client/Adapter/Guzzle.php b/library/Solarium/Core/Client/Adapter/Guzzle.php
new file mode 100644
index 000000000..85cab896a
--- /dev/null
+++ b/library/Solarium/Core/Client/Adapter/Guzzle.php
@@ -0,0 +1,174 @@
+<?php
+/**
+ * Copyright 2011 Bas de Nooijer. All rights reserved.
+ * * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this listof conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ * The views and conclusions contained in the software and documentation are
+ * those of the authors and should not be interpreted as representing official
+ * policies, either expressed or implied, of the copyright holder.
+ *
+ * @copyright Copyright 2011 Bas de Nooijer <solarium@raspberry.nl>
+ * @license http://github.com/basdenooijer/solarium/raw/master/COPYING
+ *
+ * @link http://www.solarium-project.org/
+ */
+
+namespace Solarium\Core\Client\Adapter;
+
+use GuzzleHttp\Client as GuzzleClient;
+use GuzzleHttp\RequestOptions;
+use Solarium\Core\Configurable;
+use Solarium\Core\Client\Request;
+use Solarium\Core\Client\Response;
+use Solarium\Core\Client\Endpoint;
+use Solarium\Exception\HttpException;
+
+/**
+ * Guzzle HTTP adapter.
+ */
+class Guzzle extends Configurable implements AdapterInterface
+{
+    /**
+     * The Guzzle HTTP client instance.
+     *
+     * @var GuzzleClient
+     */
+    private $guzzleClient;
+
+    /**
+     * Execute a Solr request using the cURL Http.
+     *
+     * @param Request  $request  The incoming Solr request.
+     * @param Endpoint $endpoint The configured Solr endpoint.
+     *
+     * @return Response
+     *
+     * @throws HttpException Thrown if solr request connot be made.
+     *
+     * @codingStandardsIgnoreStart AdapterInterface does not declare type-hints
+     */
+    public function execute($request, $endpoint)
+    {
+        //@codingStandardsIgnoreEnd
+        $requestOptions = [
+            RequestOptions::HEADERS => $this->getRequestHeaders($request),
+            RequestOptions::BODY => $this->getRequestBody($request),
+            RequestOptions::TIMEOUT => $endpoint->getTimeout(),
+        ];
+
+        // Try endpoint authentication first, fallback to request for backwards compatibility
+        $authData = $endpoint->getAuthentication();
+        if (empty($authData['username'])) {
+            $authData = $request->getAuthentication();
+        }
+
+        if (!empty($authData['username']) && !empty($authData['password'])) {
+            $requestOptions[RequestOptions::AUTH] = [$authData['username'], $authData['password']];
+        }
+
+        try {
+            $guzzleResponse = $this->getGuzzleClient()->request(
+                $request->getMethod(),
+                $endpoint->getBaseUri() . $request->getUri(),
+                $requestOptions
+            );
+
+            $responseHeaders = [
+                "HTTP/{$guzzleResponse->getProtocolVersion()} {$guzzleResponse->getStatusCode()} "
+                . $guzzleResponse->getReasonPhrase(),
+            ];
+
+            foreach ($guzzleResponse->getHeaders() as $key => $value) {
+                $responseHeaders[] = "{$key}: " . implode(', ', $value);
+            }
+
+            return new Response((string)$guzzleResponse->getBody(), $responseHeaders);
+        } catch (\GuzzleHttp\Exception\RequestException $e) {
+            $error = $e->getMessage();
+            throw new HttpException("HTTP request failed, {$error}");
+        }
+    }
+
+    /**
+     * Gets the Guzzle HTTP client instance.
+     *
+     * @return GuzzleClient
+     */
+    public function getGuzzleClient()
+    {
+        if ($this->guzzleClient === null) {
+            $this->guzzleClient = new GuzzleClient($this->options);
+        }
+
+        return $this->guzzleClient;
+    }
+
+    /**
+     * Helper method to create a request body suitable for a guzzle 3 request.
+     *
+     * @param Request $request The incoming solarium request.
+     *
+     * @return null|resource|string
+     */
+    private function getRequestBody(Request $request)
+    {
+        if ($request->getMethod() !== Request::METHOD_POST) {
+            return null;
+        }
+
+        if ($request->getFileUpload()) {
+            return fopen($request->getFileUpload(), 'r');
+        }
+
+        return $request->getRawData();
+    }
+
+    /**
+     * Helper method to extract headers from the incoming solarium request and put them in a format
+     * suitable for a guzzle 3 request.
+     *
+     * @param Request $request The incoming solarium request.
+     *
+     * @return array
+     */
+    private function getRequestHeaders(Request $request)
+    {
+        $headers = [];
+        foreach ($request->getHeaders() as $headerLine) {
+            list($header, $value) = explode(':', $headerLine);
+            if ($header = trim($header)) {
+                $headers[$header] = trim($value);
+            }
+        }
+
+        if (!isset($headers['Content-Type'])) {
+            if ($request->getMethod() == Request::METHOD_GET) {
+                $headers['Content-Type'] = 'application/x-www-form-urlencoded; charset=utf-8';
+            } else {
+                $headers['Content-Type'] = 'application/xml; charset=utf-8';
+            }
+        }
+
+        return $headers;
+    }
+}
diff --git a/tests/Solarium/Tests/Core/Client/Adapter/Guzzle3Test.php b/tests/Solarium/Tests/Core/Client/Adapter/Guzzle3Test.php
index 9bc45b371..0133fc33f 100644
--- a/tests/Solarium/Tests/Core/Client/Adapter/Guzzle3Test.php
+++ b/tests/Solarium/Tests/Core/Client/Adapter/Guzzle3Test.php
@@ -58,6 +58,10 @@ final class Guzzle3Test extends \PHPUnit_Framework_TestCase
      */
     public function setUp()
     {
+        if (!class_exists('\\Guzzle\\Http\\Client')) {
+            $this->markTestSkipped('Guzzle 3 not installed');
+        }
+
         $this->adapter = new GuzzleAdapter();
     }
 
diff --git a/tests/Solarium/Tests/Core/Client/Adapter/GuzzleTest.php b/tests/Solarium/Tests/Core/Client/Adapter/GuzzleTest.php
new file mode 100644
index 000000000..dbc526cdf
--- /dev/null
+++ b/tests/Solarium/Tests/Core/Client/Adapter/GuzzleTest.php
@@ -0,0 +1,319 @@
+<?php
+/**
+ * Copyright 2011 Bas de Nooijer. All rights reserved.
+ * * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this listof conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ * The views and conclusions contained in the software and documentation are
+ * those of the authors and should not be interpreted as representing official
+ * policies, either expressed or implied, of the copyright holder.
+ *
+ * @copyright Copyright 2011 Bas de Nooijer <solarium@raspberry.nl>
+ * @license http://github.com/basdenooijer/solarium/raw/master/COPYING
+ *
+ * @link http://www.solarium-project.org/
+ */
+
+namespace Solarium\Tests\Core\Client\Adapter;
+
+use GuzzleHttp\Client as GuzzleClient;
+use GuzzleHttp\Handler\MockHandler;
+use GuzzleHttp\HandlerStack;
+use GuzzleHttp\Middleware;
+use GuzzleHttp\Psr7\Response;
+use Solarium\Core\Client\Adapter\Guzzle as GuzzleAdapter;
+use Solarium\Core\Client\Endpoint;
+use Solarium\Core\Client\Request;
+use Solarium\Core\Exception;
+
+/**
+ * @coversDefaultClass \Solarium\Core\Client\Adapter\Guzzle
+ * @covers ::<private>
+ * @covers ::getGuzzleClient
+ */
+final class GuzzleAdapterTest extends \PHPUnit_Framework_TestCase
+{
+    /**
+     * Prepare each test.
+     *
+     * @return void
+     */
+    public function setUp()
+    {
+        if (!class_exists('\\GuzzleHttp\\Client')) {
+            $this->markTestSkipped('Guzzle 6 not installed');
+        }
+    }
+
+    /**
+     * Verify basic behavior of execute()
+     *
+     * @test
+     * @covers ::execute
+     *
+     * @return void
+     */
+    public function executeGet()
+    {
+        $guzzleResponse = $this->getValidResponse();
+        $mockHandler = new MockHandler([$guzzleResponse]);
+
+        $container = [];
+        $history = Middleware::history($container);
+
+        $stack = HandlerStack::create($mockHandler);
+        $stack->push($history);
+
+        $adapter = new GuzzleAdapter(['handler' => $stack]);
+
+        $request = new Request();
+        $request->setMethod(Request::METHOD_GET);
+        $request->addHeader('X-PHPUnit: request value');
+
+        $endpoint = new Endpoint();
+        $endpoint->setTimeout(10);
+
+        $response = $adapter->execute($request, $endpoint);
+        $this->assertSame('OK', $response->getStatusMessage());
+        $this->assertSame('200', $response->getStatusCode());
+        $this->assertSame(
+            [
+                'HTTP/1.1 200 OK',
+                'Content-Type: application/json',
+                'X-PHPUnit: response value',
+            ],
+            $response->getHeaders()
+        );
+        $this->assertSame((string)$guzzleResponse->getBody(), $response->getBody());
+
+        $this->assertCount(1, $container);
+        $this->assertSame('GET', $container[0]['request']->getMethod());
+        $this->assertSame('request value', $container[0]['request']->getHeaderline('X-PHPUnit'));
+    }
+
+    /**
+     * Verify execute() with request containing file
+     *
+     * @test
+     * @covers ::execute
+     *
+     * @return void
+     */
+    public function executePostWithFile()
+    {
+        $guzzleResponse = $this->getValidResponse();
+        $mockHandler = new MockHandler([$guzzleResponse]);
+
+        $container = [];
+        $history = Middleware::history($container);
+
+        $stack = HandlerStack::create($mockHandler);
+        $stack->push($history);
+
+        $adapter = new GuzzleAdapter(['handler' => $stack]);
+
+        $request = new Request();
+        $request->setMethod(Request::METHOD_POST);
+        $request->addHeader('X-PHPUnit: request value');
+        $request->setFileUpload(__FILE__);
+
+        $endpoint = new Endpoint();
+        $endpoint->setTimeout(10);
+
+        $response = $adapter->execute($request, $endpoint);
+        $this->assertSame('OK', $response->getStatusMessage());
+        $this->assertSame('200', $response->getStatusCode());
+        $this->assertSame(
+            [
+                'HTTP/1.1 200 OK',
+                'Content-Type: application/json',
+                'X-PHPUnit: response value',
+            ],
+            $response->getHeaders()
+        );
+        $this->assertSame((string)$guzzleResponse->getBody(), $response->getBody());
+
+        $this->assertCount(1, $container);
+        $this->assertSame('POST', $container[0]['request']->getMethod());
+        $this->assertSame('request value', $container[0]['request']->getHeaderline('X-PHPUnit'));
+        $this->assertSame(file_get_contents(__FILE__), (string)$container[0]['request']->getBody());
+    }
+
+    /**
+     * Verify execute() with request containing raw body
+     *
+     * @test
+     * @covers ::execute
+     *
+     * @return void
+     */
+    public function executePostWithRawBody()
+    {
+        $guzzleResponse = $this->getValidResponse();
+        $mockHandler = new MockHandler([$guzzleResponse]);
+
+        $container = [];
+        $history = Middleware::history($container);
+
+        $stack = HandlerStack::create($mockHandler);
+        $stack->push($history);
+
+        $adapter = new GuzzleAdapter(['handler' => $stack]);
+
+        $request = new Request();
+        $request->setMethod(Request::METHOD_POST);
+        $request->addHeader('X-PHPUnit: request value');
+        $xml = '<root><parent><child>some data</child></parent></root>';
+        $request->setRawData($xml);
+
+        $endpoint = new Endpoint();
+        $endpoint->setTimeout(10);
+
+        $response = $adapter->execute($request, $endpoint);
+        $this->assertSame('OK', $response->getStatusMessage());
+        $this->assertSame('200', $response->getStatusCode());
+        $this->assertSame(
+            [
+                'HTTP/1.1 200 OK',
+                'Content-Type: application/json',
+                'X-PHPUnit: response value',
+            ],
+            $response->getHeaders()
+        );
+        $this->assertSame((string)$guzzleResponse->getBody(), $response->getBody());
+
+        $this->assertCount(1, $container);
+        $this->assertSame('POST', $container[0]['request']->getMethod());
+        $this->assertSame('request value', $container[0]['request']->getHeaderline('X-PHPUnit'));
+        $this->assertSame('application/xml; charset=utf-8', $container[0]['request']->getHeaderline('Content-Type'));
+        $this->assertSame($xml, (string)$container[0]['request']->getBody());
+    }
+
+    /**
+     * Verify execute() with GET request containing Authentication.
+     *
+     * @test
+     * @covers ::execute
+     *
+     * @return void
+     */
+    public function executeGetWithAuthentication()
+    {
+        $guzzleResponse = $this->getValidResponse();
+        $mockHandler = new MockHandler([$guzzleResponse]);
+
+        $container = [];
+        $history = Middleware::history($container);
+
+        $stack = HandlerStack::create($mockHandler);
+        $stack->push($history);
+
+        $adapter = new GuzzleAdapter(['handler' => $stack]);
+
+        $request = new Request();
+        $request->setMethod(Request::METHOD_GET);
+        $request->addHeader('X-PHPUnit: request value');
+        $request->setAuthentication('username', 's3cr3t');
+
+        $endpoint = new Endpoint();
+        $endpoint->setTimeout(10);
+
+        $response = $adapter->execute($request, $endpoint);
+        $this->assertSame('OK', $response->getStatusMessage());
+        $this->assertSame('200', $response->getStatusCode());
+        $this->assertSame(
+            [
+                'HTTP/1.1 200 OK',
+                'Content-Type: application/json',
+                'X-PHPUnit: response value',
+            ],
+            $response->getHeaders()
+        );
+        $this->assertSame((string)$guzzleResponse->getBody(), $response->getBody());
+
+        $this->assertCount(1, $container);
+        $this->assertSame('GET', $container[0]['request']->getMethod());
+        $this->assertSame('request value', $container[0]['request']->getHeaderline('X-PHPUnit'));
+        $this->assertSame(
+            'Basic ' . base64_encode('username:s3cr3t'),
+            $container[0]['request']->getHeaderLine('Authorization')
+        );
+    }
+
+    /**
+     * Verify execute() with GET when guzzle throws an exception.
+     *
+     * @test
+     * @covers ::execute
+     * @expectedException \Solarium\Exception\HttpException
+     * @expectedExceptionMessage HTTP request failed
+     *
+     * @return void
+     */
+    public function executeRequestException()
+    {
+        $adapter = new GuzzleAdapter();
+
+        $request = new Request();
+        $request->setMethod(Request::METHOD_GET);
+
+        $endpoint = new Endpoint(
+            [
+                'scheme'  => 'silly', //invalid protocol
+            ]
+        );
+        $endpoint->setTimeout(10);
+
+        $adapter->execute($request, $endpoint);
+    }
+
+    /**
+     * Helper method to create a valid Guzzle response.
+     *
+     * @return Response
+     */
+    private function getValidResponse()
+    {
+        $body = json_encode(
+            [
+                'response' => [
+                    'numFound' => 10,
+                    'start' => 0,
+                    'docs' => [
+                        [
+                            'id' => '58339e95d5200',
+                            'author' => 'Gambardella, Matthew',
+                            'title' => "XML Developer's Guide",
+                            'genre' => 'Computer',
+                            'price' => 44.95,
+                            'published' => 970372800,
+                            'description' => 'An in-depth look at creating applications with XML.',
+                        ],
+                    ],
+                ],
+            ]
+        );
+
+        $headers = ['Content-Type' => 'application/json', 'X-PHPUnit' => 'response value'];
+        return new Response(200, $headers, $body);
+    }
+}