diff --git a/composer.json b/composer.json
index 904c34d..0a52715 100644
--- a/composer.json
+++ b/composer.json
@@ -18,5 +18,8 @@
             "Yangqi\\Htmldom": "src/"
         }
     },
-    "minimum-stability": "dev"
-}
\ No newline at end of file
+    "minimum-stability": "dev",
+    "require-dev": {
+        "phpunit/phpunit": "^6.5"
+    }
+}
diff --git a/phpunit.xml b/phpunit.xml
new file mode 100644
index 0000000..8c13310
--- /dev/null
+++ b/phpunit.xml
@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<phpunit bootstrap="./vendor/autoload.php" backupGlobals="false" backupStaticAttributes="false" colors="true" convertErrorsToExceptions="true" convertNoticesToExceptions="true" convertWarningsToExceptions="true" processIsolation="false" stopOnFailure="false" syntaxCheck="false">
+    <testsuites>
+        <testsuite name="Package Test Suite">
+            <directory suffix=".php">./tests/</directory>
+        </testsuite>
+    </testsuites>
+</phpunit>
\ No newline at end of file
diff --git a/src/Yangqi/Htmldom/Htmldom.php b/src/Yangqi/Htmldom/Htmldom.php
index 10a375e..70208e3 100644
--- a/src/Yangqi/Htmldom/Htmldom.php
+++ b/src/Yangqi/Htmldom/Htmldom.php
@@ -89,6 +89,7 @@ class Htmldom {
 	public $_target_charset = '';
 	protected $default_br_text = "";
 	public $default_span_text = "";
+	public $response_code = null;
 
 	// use isset instead of in_array, performance boost about 30%...
 	protected $self_closing_tags = array('img'=>1, 'br'=>1, 'input'=>1, 'meta'=>1, 'link'=>1, 'hr'=>1, 'base'=>1, 'embed'=>1, 'spacer'=>1);
@@ -176,6 +177,7 @@ public function load_file()
 	{
 		$args = func_get_args();
 		$this->load(call_user_func_array('file_get_contents', $args), true);
+		$this->set_response_code($http_response_header[0]);
 		// Throw an error if we can't properly load the dom.
 		if (($error=error_get_last())!==null) {
 			$this->clear();
@@ -418,6 +420,13 @@ protected function parse_charset()
 		return $this->_charset = $charset;
 	}
 
+	// search response code in $http_response_header variable.
+	protected function set_response_code($response_string)
+	{
+		$response_parts = explode(' ', $response_string);
+		$this->response_code = $response_parts[1];
+	}
+
 	// read tag info
 	protected function read_tag()
 	{
diff --git a/tests/ResponseCodeTest.php b/tests/ResponseCodeTest.php
new file mode 100644
index 0000000..cd4948d
--- /dev/null
+++ b/tests/ResponseCodeTest.php
@@ -0,0 +1,44 @@
+<?php
+
+use PHPUnit\Framework\TestCase;
+use Yangqi\Htmldom\Htmldom;
+
+class ReseponseCodeTest extends TestCase
+{
+
+    public function testContinueCode()
+    {
+        $htmldom = new Htmldom('https://httpstat.us/100');
+
+        $this->assertEquals(100, $htmldom->response_code);
+    }
+
+    public function testOKCode()
+    {
+        $htmldom = new Htmldom('https://httpstat.us/200');
+
+        $this->assertEquals(200, $htmldom->response_code);
+    }
+
+    public function testMultipleChoicesCode()
+    {
+        $htmldom = new Htmldom('https://httpstat.us/300');
+
+        $this->assertEquals(300, $htmldom->response_code);
+    }
+
+    public function testBadRequestCode()
+    {
+        $htmldom = new Htmldom('https://httpstat.us/400');
+
+        $this->assertEquals(400, $htmldom->response_code);
+    }
+
+    public function testInternalServerErrorCode()
+    {
+        $htmldom = new Htmldom('https://httpstat.us/500');
+
+        $this->assertEquals(500, $htmldom->response_code);
+    }
+
+}
\ No newline at end of file