diff --git a/SensioLabs/Security/Command/SecurityCheckerCommand.php b/SensioLabs/Security/Command/SecurityCheckerCommand.php
index 245a018..f4f40bc 100644
--- a/SensioLabs/Security/Command/SecurityCheckerCommand.php
+++ b/SensioLabs/Security/Command/SecurityCheckerCommand.php
@@ -3,7 +3,7 @@
 /*
  * This file is part of the SensioLabs Security Checker.
  *
- * (c) 2013 Fabien Potencier
+ * (c) Fabien Potencier
  *
  * For the full copyright and license information, please view the LICENSE
  * file that was distributed with this source code.
diff --git a/SensioLabs/Security/Crawler/BaseCrawler.php b/SensioLabs/Security/Crawler/BaseCrawler.php
new file mode 100644
index 0000000..785ed07
--- /dev/null
+++ b/SensioLabs/Security/Crawler/BaseCrawler.php
@@ -0,0 +1,83 @@
+<?php
+
+/*
+ * This file is part of the SensioLabs Security Checker.
+ *
+ * (c) Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace SensioLabs\Security\Crawler;
+
+use SensioLabs\Security\Exception\RuntimeException;
+
+/**
+ * @internal
+ */
+abstract class BaseCrawler implements CrawlerInterface
+{
+    protected $endPoint = 'https://security.sensiolabs.org/check_lock';
+    protected $timeout = 20;
+
+    /**
+     * {@inheritdoc}
+     */
+    public function setTimeout($timeout)
+    {
+        $this->timeout = $timeout;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function setEndPoint($endPoint)
+    {
+        $this->endPoint = $endPoint;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function check($lock)
+    {
+        $certFile = $this->getCertFile();
+
+        try {
+            list($headers, $body) = $this->doCheck($lock, $certFile);
+        } catch (\Exception $e) {
+            if (__DIR__.'/../Resources/security.sensiolabs.org.crt' !== $certFile) {
+                unlink($certFile);
+            }
+
+            throw $e;
+        }
+
+        if (!(preg_match('/X-Alerts: (\d+)/', $headers, $matches) || 2 == count($matches))) {
+            throw new RuntimeException('The web service did not return alerts count.');
+        }
+
+        return array(intval($matches[1]), json_decode($body, true));
+    }
+
+    /**
+     * @return array An array where the first element is a headers string and second one the response body
+     */
+    abstract protected function doCheck($lock, $certFile);
+
+    private function getCertFile()
+    {
+        $certFile = __DIR__.'/../Resources/security.sensiolabs.org.crt';
+        if ('phar://' !== substr(__FILE__, 0, 7)) {
+            return $certFile;
+        }
+
+        $tmpFile = tempnam(sys_get_temp_dir(), 'sls');
+        if (false === @copy($certFile, $tmpFile)) {
+            throw new RuntimeException(sprintf('Unable to copy the certificate in "%s".', $tmpFile));
+        }
+
+        return $tmpFile;
+    }
+}
diff --git a/SensioLabs/Security/Crawler/CrawlerInterface.php b/SensioLabs/Security/Crawler/CrawlerInterface.php
new file mode 100644
index 0000000..14d0b67
--- /dev/null
+++ b/SensioLabs/Security/Crawler/CrawlerInterface.php
@@ -0,0 +1,31 @@
+<?php
+
+/*
+ * This file is part of the SensioLabs Security Checker.
+ *
+ * (c) Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace SensioLabs\Security\Crawler;
+
+/**
+ * @internal
+ */
+interface CrawlerInterface
+{
+    /**
+     * Checks a Composer lock file.
+     *
+     * @param string $lock The path to the composer.lock file
+     *
+     * @return An array of two items: the number of vulnerabilities and an array of vulnerabilities
+     */
+    public function check($lock);
+
+    public function setTimeout($timeout);
+
+    public function setEndPoint($endPoint);
+}
diff --git a/SensioLabs/Security/Crawler/CurlCrawler.php b/SensioLabs/Security/Crawler/CurlCrawler.php
new file mode 100644
index 0000000..694dcab
--- /dev/null
+++ b/SensioLabs/Security/Crawler/CurlCrawler.php
@@ -0,0 +1,82 @@
+<?php
+
+/*
+ * This file is part of the SensioLabs Security Checker.
+ *
+ * (c) Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace SensioLabs\Security\Crawler;
+
+use SensioLabs\Security\Exception\RuntimeException;
+
+/**
+ * @internal
+ */
+class CurlCrawler extends BaseCrawler
+{
+    public function __construct()
+    {
+        if (!function_exists('curl_init')) {
+            throw new RuntimeException('cURL is required to use the cURL crawler.');
+        }
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    protected function doCheck($lock, $certFile)
+    {
+        if (false === $curl = curl_init()) {
+            throw new RuntimeException('Unable to create a cURL handle.');
+        }
+
+        $postFields = array('lock' => PHP_VERSION_ID >= 50500 ? new \CurlFile($lock) : '@'.$lock);
+
+        curl_setopt($curl, CURLOPT_RETURNTRANSFER, true);
+        curl_setopt($curl, CURLOPT_HEADER, true);
+        curl_setopt($curl, CURLOPT_URL, $this->endPoint);
+        curl_setopt($curl, CURLOPT_HTTPHEADER, array('Accept: application/json'));
+        curl_setopt($curl, CURLOPT_POSTFIELDS, $postFields);
+        curl_setopt($curl, CURLOPT_CONNECTTIMEOUT, $this->timeout);
+        curl_setopt($curl, CURLOPT_TIMEOUT, 10);
+        curl_setopt($curl, CURLOPT_FOLLOWLOCATION, 1);
+        curl_setopt($curl, CURLOPT_MAXREDIRS, 3);
+        curl_setopt($curl, CURLOPT_FAILONERROR, false);
+        curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, 1);
+        curl_setopt($curl, CURLOPT_SSL_VERIFYHOST, 2);
+        curl_setopt($curl, CURLOPT_CAINFO, $certFile);
+
+        $response = curl_exec($curl);
+
+        if (false === $response) {
+            $error = curl_error($curl);
+            curl_close($curl);
+
+            throw new RuntimeException(sprintf('An error occurred: %s.', $error));
+        }
+
+        $headersSize = curl_getinfo($curl, CURLINFO_HEADER_SIZE);
+        $headers = substr($response, 0, $headersSize);
+        $body = substr($response, $headersSize);
+
+        $statusCode = curl_getinfo($curl, CURLINFO_HTTP_CODE);
+        curl_close($curl);
+
+        if (400 == $statusCode) {
+            $data = json_decode($body, true);
+            $error = $data['error'];
+
+            throw new RuntimeException($error);
+        }
+
+        if (200 != $statusCode) {
+            throw new RuntimeException(sprintf('The web service failed for an unknown reason (HTTP %s).', $statusCode));
+        }
+
+        return array($headers, $body);
+    }
+}
diff --git a/SensioLabs/Security/Crawler/DefaultCrawler.php b/SensioLabs/Security/Crawler/DefaultCrawler.php
new file mode 100644
index 0000000..af06a9b
--- /dev/null
+++ b/SensioLabs/Security/Crawler/DefaultCrawler.php
@@ -0,0 +1,49 @@
+<?php
+
+/*
+ * This file is part of the SensioLabs Security Checker.
+ *
+ * (c) Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace SensioLabs\Security\Crawler;
+
+/**
+ * @internal
+ */
+class DefaultCrawler implements CrawlerInterface
+{
+    private $crawler;
+
+    public function __construct()
+    {
+        $this->crawler = function_exists('curl_init') ? new CurlCrawler() : new FileGetContentsCrawler();
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function check($lock)
+    {
+        return $this->crawler->check($lock);
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function setTimeout($timeout)
+    {
+        $this->crawler->setTimeout($timeout);
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function setEndPoint($endPoint)
+    {
+        $this->crawler->setEndPoint($endPoint);
+    }
+}
diff --git a/SensioLabs/Security/Crawler/FileGetContentsCrawler.php b/SensioLabs/Security/Crawler/FileGetContentsCrawler.php
new file mode 100644
index 0000000..c77921b
--- /dev/null
+++ b/SensioLabs/Security/Crawler/FileGetContentsCrawler.php
@@ -0,0 +1,78 @@
+<?php
+
+/*
+ * This file is part of the SensioLabs Security Checker.
+ *
+ * (c) Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace SensioLabs\Security\Crawler;
+
+use SensioLabs\Security\Exception\RuntimeException;
+
+/**
+ * @internal
+ */
+class FileGetContentsCrawler extends BaseCrawler
+{
+    /**
+     * {@inheritdoc}
+     */
+    protected function doCheck($lock, $certFile)
+    {
+        $boundary = '------------------------'.md5(microtime(true));
+        $context = stream_context_create(array(
+            'http' => array(
+                'method' => 'POST',
+                'header' => "Content-Type: multipart/form-data; boundary=$boundary\r\nAccept: application/json",
+                'content' => "--$boundary\r\nContent-Disposition: form-data; name=\"lock\"; filename=\"$lock\"\r\nContent-Type: application/octet-stream\r\n\r\n".file_get_contents($lock)."\r\n--$boundary\r\n--\r\n",
+                'ignore_errors' => true,
+                'follow_location' => true,
+                'max_redirects' => 3,
+                'timeout' => $this->timeout,
+            ),
+            'ssl' => array(
+                'cafile' => $certFile,
+                'verify_peer' => 1,
+                'verify_host' => 2,
+            ),
+        ));
+
+        $level = error_reporting(0);
+        $body = file_get_contents($this->endPoint, 0, $context);
+        error_reporting($level);
+        if (false === $body) {
+            $error = error_get_last();
+
+            throw new RuntimeException(sprintf('An error occurred: %s.', $error['message']));
+        }
+
+        // status code
+        if (!preg_match('{HTTP/\d\.\d (\d+) }i', $http_response_header[0], $match)) {
+            throw new RuntimeException('An unknown error occurred.');
+        }
+
+        $statusCode = $match[1];
+        if (400 == $statusCode) {
+            $data = json_decode($body, true);
+
+            throw new RuntimeException($data['error']);
+        }
+
+        if (200 != $statusCode) {
+            throw new RuntimeException(sprintf('The web service failed for an unknown reason (HTTP %s).', $statusCode));
+        }
+
+        $headers = '';
+        foreach ($http_response_header as $header) {
+            if (false !== strpos($header, 'X-Alerts: ')) {
+                $headers = $header;
+            }
+        }
+
+        return array($headers, $body);
+    }
+}
diff --git a/SensioLabs/Security/Formatters/JsonFormatter.php b/SensioLabs/Security/Formatters/JsonFormatter.php
index 1e64a3d..a67bf01 100644
--- a/SensioLabs/Security/Formatters/JsonFormatter.php
+++ b/SensioLabs/Security/Formatters/JsonFormatter.php
@@ -3,7 +3,7 @@
 /*
  * This file is part of the SensioLabs Security Checker.
  *
- * (c) 2013 Fabien Potencier
+ * (c) Fabien Potencier
  *
  * For the full copyright and license information, please view the LICENSE
  * file that was distributed with this source code.
diff --git a/SensioLabs/Security/Formatters/SimpleFormatter.php b/SensioLabs/Security/Formatters/SimpleFormatter.php
index 662f5a9..9f3fa46 100644
--- a/SensioLabs/Security/Formatters/SimpleFormatter.php
+++ b/SensioLabs/Security/Formatters/SimpleFormatter.php
@@ -3,7 +3,7 @@
 /*
  * This file is part of the SensioLabs Security Checker.
  *
- * (c) 2013 Fabien Potencier
+ * (c) Fabien Potencier
  *
  * For the full copyright and license information, please view the LICENSE
  * file that was distributed with this source code.
diff --git a/SensioLabs/Security/Formatters/TextFormatter.php b/SensioLabs/Security/Formatters/TextFormatter.php
index 4821806..32cb9ae 100644
--- a/SensioLabs/Security/Formatters/TextFormatter.php
+++ b/SensioLabs/Security/Formatters/TextFormatter.php
@@ -3,7 +3,7 @@
 /*
  * This file is part of the SensioLabs Security Checker.
  *
- * (c) 2013 Fabien Potencier
+ * (c) Fabien Potencier
  *
  * For the full copyright and license information, please view the LICENSE
  * file that was distributed with this source code.
@@ -67,8 +67,8 @@ public function displayResults(OutputInterface $output, $lockFilePath, array $vu
             }
         }
 
-        $output->writeln("<bg=yellow;fg=white>            </> This checker can only detect vulnerabilities that are referenced");
-        $output->writeln("<bg=yellow;fg=white> Disclaimer </> in the SensioLabs security advisories database. Execute this");
+        $output->writeln('<bg=yellow;fg=white>            </> This checker can only detect vulnerabilities that are referenced');
+        $output->writeln('<bg=yellow;fg=white> Disclaimer </> in the SensioLabs security advisories database. Execute this');
         $output->writeln("<bg=yellow;fg=white>            </> command regularly to check the newly discovered vulnerabilities.\n");
     }
 }
diff --git a/SensioLabs/Security/SecurityChecker.php b/SensioLabs/Security/SecurityChecker.php
index e3b0399..5fc741a 100644
--- a/SensioLabs/Security/SecurityChecker.php
+++ b/SensioLabs/Security/SecurityChecker.php
@@ -3,7 +3,7 @@
 /*
  * This file is part of the SensioLabs Security Checker.
  *
- * (c) 2013 Fabien Potencier
+ * (c) Fabien Potencier
  *
  * For the full copyright and license information, please view the LICENSE
  * file that was distributed with this source code.
@@ -12,21 +12,17 @@
 namespace SensioLabs\Security;
 
 use SensioLabs\Security\Exception\RuntimeException;
+use SensioLabs\Security\Crawler\CrawlerInterface;
+use SensioLabs\Security\Crawler\DefaultCrawler;
 
 class SecurityChecker
 {
-    private $endPoint = 'https://security.sensiolabs.org/check_lock';
     private $vulnerabilityCount;
-    private $timeout = 20;
+    private $crawler;
 
-    public function setTimeout($timeout)
+    public function __construct(CrawlerInterface $crawler = null)
     {
-        $this->timeout = $timeout;
-    }
-
-    public function setEndPoint($endPoint)
-    {
-        $this->endPoint = $endPoint;
+        $this->crawler = null === $crawler ? new DefaultCrawler() : $crawler;
     }
 
     /**
@@ -37,19 +33,10 @@ public function setEndPoint($endPoint)
      * @return array An array of vulnerabilities
      *
      * @throws RuntimeException When the lock file does not exist
-     * @throws RuntimeException When curl does not work or is unavailable
      * @throws RuntimeException When the certificate can not be copied
      */
     public function check($lock)
     {
-        if (!function_exists('curl_init')) {
-            throw new RuntimeException('Curl is required to use this command.');
-        }
-
-        if (false === $curl = curl_init()) {
-            throw new RuntimeException('Unable to create a new curl handle.');
-        }
-
         if (is_dir($lock) && file_exists($lock.'/composer.lock')) {
             $lock = $lock.'/composer.lock';
         } elseif (preg_match('/composer\.json$/', $lock)) {
@@ -60,85 +47,9 @@ public function check($lock)
             throw new RuntimeException('Lock file does not exist.');
         }
 
-        $postFields = array('lock' => '@'.$lock);
-
-        if (PHP_VERSION_ID >= 50500) {
-            $postFields['lock'] = new \CurlFile($lock);
-        }
-
-        curl_setopt($curl, CURLOPT_RETURNTRANSFER, true);
-        curl_setopt($curl, CURLOPT_HEADER, true);
-        curl_setopt($curl, CURLOPT_URL, $this->endPoint);
-        curl_setopt($curl, CURLOPT_HTTPHEADER, array('Accept: application/json'));
-        curl_setopt($curl, CURLOPT_POSTFIELDS, $postFields);
-        curl_setopt($curl, CURLOPT_CONNECTTIMEOUT, $this->timeout);
-        curl_setopt($curl, CURLOPT_TIMEOUT, 10);
-        curl_setopt($curl, CURLOPT_FOLLOWLOCATION, 1);
-        curl_setopt($curl, CURLOPT_MAXREDIRS, 3);
-        curl_setopt($curl, CURLOPT_FAILONERROR, false);
-        curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, 1);
-        curl_setopt($curl, CURLOPT_SSL_VERIFYHOST, 2);
-
-        $cert = __DIR__.'/Resources/security.sensiolabs.org.crt';
-        $tmpFile = null;
-        if ('phar://' === substr(__FILE__, 0, 7)) {
-            $tmpFile = tempnam(sys_get_temp_dir(), 'sls');
-            if (false === @copy($cert, $cert = $tmpFile)) {
-                throw new RuntimeException(sprintf('Unable to copy the certificate in "%s".', $tmpFile));
-            }
-        }
-        curl_setopt($curl, CURLOPT_CAINFO, $cert);
-
-        $response = curl_exec($curl);
-
-        if (false === $response) {
-            $error = curl_error($curl);
-            curl_close($curl);
-            if ($tmpFile) {
-                unlink($tmpFile);
-            }
-
-            throw new RuntimeException(sprintf('An error occurred: %s.', $error));
-        }
-
-        $headersSize = curl_getinfo($curl, CURLINFO_HEADER_SIZE);
-        $headers = substr($response, 0, $headersSize);
-        $body = substr($response, $headersSize);
-
-        $statusCode = curl_getinfo($curl, CURLINFO_HTTP_CODE);
-        if (400 == $statusCode) {
-            $data = json_decode($body, true);
-            $error = $data['error'];
-
-            curl_close($curl);
-            if ($tmpFile) {
-                unlink($tmpFile);
-            }
-
-            throw new RuntimeException($error);
-        }
-
-        if (200 != $statusCode) {
-            curl_close($curl);
-            if ($tmpFile) {
-                unlink($tmpFile);
-            }
-
-            throw new RuntimeException(sprintf('The web service failed for an unknown reason (HTTP %s).', $statusCode));
-        }
-
-        curl_close($curl);
-        if ($tmpFile) {
-            unlink($tmpFile);
-        }
-
-        if (!(preg_match('/X-Alerts: (\d+)/', $headers, $matches) || 2 == count($matches))) {
-            throw new RuntimeException('The web service did not return alerts count.');
-        }
-
-        $this->vulnerabilityCount = intval($matches[1]);
+        list($this->vulnerabilityCount, $vulnerabilities) = $this->crawler->check($lock);
 
-        return json_decode($body, true);
+        return $vulnerabilities;
     }
 
     public function getLastVulnerabilityCount()
diff --git a/composer.json b/composer.json
index a278c95..b3cd466 100644
--- a/composer.json
+++ b/composer.json
@@ -9,7 +9,6 @@
         }
     ],
     "require": {
-        "ext-curl": "*",
         "symfony/console": "~2.0"
     },
     "bin": ["security-checker"],
@@ -18,7 +17,7 @@
     },
     "extra": {
         "branch-alias": {
-            "dev-master": "2.0-dev"
+            "dev-master": "3.0-dev"
         }
     }
 }
diff --git a/security-checker b/security-checker
index 0f8192c..d95dadd 100755
--- a/security-checker
+++ b/security-checker
@@ -4,7 +4,7 @@
 /*
  * This file is part of the SensioLabs Security Checker.
  *
- * (c) 2013 Fabien Potencier
+ * (c) Fabien Potencier
  *
  * For the full copyright and license information, please view the LICENSE
  * file that was distributed with this source code.
@@ -27,6 +27,6 @@ use Symfony\Component\Console\Application;
 use SensioLabs\Security\Command\SecurityCheckerCommand;
 use SensioLabs\Security\SecurityChecker;
 
-$console = new Application('SensioLabs Security Checker', '2.0');
+$console = new Application('SensioLabs Security Checker', '3.0');
 $console->add(new SecurityCheckerCommand(new SecurityChecker()));
 $console->run();