diff --git a/Favicon.php b/Favicon.php
index 7791c9e..056db28 100644
--- a/Favicon.php
+++ b/Favicon.php
@@ -134,7 +134,7 @@ class Favicon
          * 获取过程结束
          * 计算时间及内存的占用信息
          */
-        $time_end = microtime(TRUE);
+        $time_end               = microtime(TRUE);
         $this->_last_time_spend = $time_end - $time_start;
 
         $this->_last_memory_usage = ((!function_exists('memory_get_usage')) ? '0' : round(memory_get_usage() / 1024 / 1024, 2)) . 'MB';
@@ -187,7 +187,8 @@ class Favicon
         return array(
             'X-Robots-Tag: noindex, nofollow',
             'Content-type: image/x-icon',
-          	'Cache-Control: public, max-age=604800'
+            'Cache-Control: public, max-age=86400',
+            'Expires: ' . gmdate('D, d M Y H:i:s', time() + 86400) . ' GMT'
         );
     }
 
@@ -228,7 +229,7 @@ class Favicon
      * @return bool|string
      */
     protected function getData()
-    { 
+    {
         // 尝试匹配映射
         $this->data = $this->_match_file_map();
 
@@ -263,7 +264,7 @@ class Favicon
                         //解析HTML中的相对URL 路径
                         $match_url[2] = $this->filterRelativeUrl(trim($match_url[2]), $this->params['origin_url']);
 
-                        $icon = $this->getFile($match_url[2],true);
+                        $icon = $this->getFile($match_url[2], true);
 
                         if ($icon && $icon['status'] == 'OK') {
 
@@ -285,7 +286,7 @@ class Favicon
 
         //未能从LINK标签中获取图标（可能是网址无法打开，或者指定的文件无法打开，或未定义图标地址）
         //将使用网站根目录的文件代替
-        $data = $this->getFile($this->full_host . '/favicon.ico',true);
+        $data = $this->getFile($this->full_host . '/favicon.ico', true);
 
         if ($data && $data['status'] == 'OK') {
             $this->_log_message("Success get icon from website root: {$this->full_host}/favicon.ico");
@@ -297,7 +298,7 @@ class Favicon
 
             if ($ret) {
                 //最后的尝试，从重定向后的网址根目录获取favicon文件
-                $data = $this->getFile($this->full_host . '/favicon.ico',true);
+                $data = $this->getFile($this->full_host . '/favicon.ico', true);
 
                 if ($data && $data['status'] == 'OK') {
                     $this->_log_message("Success get icon from redirect file: {$this->full_host}/favicon.ico");
@@ -306,17 +307,17 @@ class Favicon
 
             }
         }
-        
+
         /**
          * 从其他api最后获取图像 -----------------------------------------------------
          * t3.gstatic.com 国内可用 t3.gstatic.cn
          */
         if ($this->data == NULL) {
-            $thrurl='http://t3.gstatic.cn/faviconV2?client=SOCIAL&type=FAVICON&fallback_opts=TYPE,SIZE,URL&size=128&url='.$this->full_host;
-            $icon = file_get_contents($thrurl);
-            if($icon){   
+            $thrurl = 'http://t3.gstatic.cn/faviconV2?client=SOCIAL&type=FAVICON&fallback_opts=TYPE,SIZE,URL&size=128&url=' . $this->full_host;
+            $icon   = file_get_contents($thrurl);
+            if ($icon) {
                 $this->_log_message("--https://t3.gstatic.com/{$this->full_host}/favicon.ico");
-                $this->data = $icon; 
+                $this->data = $icon;
             }
         }
 
@@ -347,16 +348,15 @@ class Favicon
          */
         $parsed_url = parse_url($url);
 
-        if (!isset($parsed_url['host']) || !$parsed_url['host']) {
+        if ($parsed_url === false || !isset($parsed_url['host']) || !$parsed_url['host']) {
             //在URL的前面加上http://
-            // add the prefix
             if (!preg_match('/^https?:\/\/.*/', $url))
                 $url = 'http://' . $url;
             //解析URL并将结果保存到 $this->url
             $parsed_url = parse_url($url);
 
-            if ($parsed_url == FALSE) {
-                return FALSE;
+            if ($parsed_url === false) {
+                return false;
             } else {
                 /**
                  * 能成功解析的话就可以设置原始URL为这个添加过http://前缀的URL
@@ -423,7 +423,7 @@ class Favicon
 
         //STEP5.2: 使用'/'分割URL字符串以获取目录的每一部分进行判断
         $URI_full_dir = ltrim($URI_dir . '/' . $url, '/');
-        $URL_arr = explode('/', $URI_full_dir);
+        $URL_arr      = explode('/', $URI_full_dir);
 
         // 这里为了解决有些网站在根目录下的文件也使用 ../img/favicon.ico 这种形式的错误,
         // 对这种本来不合理的路径予以通过, 并忽略掉前面的两个点 (没错, 我说的是 gruntjs 的官网)
@@ -439,7 +439,7 @@ class Favicon
                 while (TRUE) {
                     if (isset($dst_arr[$i - $j]) && $dst_arr[$i - $j] != FALSE) {
                         $dst_arr[$i - $j] = FALSE;
-                        $dst_arr[$i] = FALSE;
+                        $dst_arr[$i]      = FALSE;
                         break;
                     } else {
                         $j++;
@@ -472,6 +472,12 @@ class Favicon
     private function getFile($url, $isimg = false, $timeout = 2)
     {
         $ch = curl_init($url);
+
+        //添加以下设置：
+        curl_setopt($ch, CURLOPT_TIMEOUT, 5);//设置总体超时5秒
+        curl_setopt($ch, CURLOPT_NOSIGNAL, 1);//在多线程下使用超时选项
+        curL_setopt($ch, CURLOPT_TCP_NODELAY, 1);//不延迟传输
+
         curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, $timeout);
         /*
          * 2019-06-20
@@ -484,29 +490,35 @@ class Favicon
 
         /** @var mixed 只获取500kb的数据，如果目标图片超过500kb，则丢弃 */
         $request_headers = array('Range: bytes=0-512000'); //500 KB
-        curl_setopt( $ch, CURLOPT_FORBID_REUSE, true );
+        curl_setopt($ch, CURLOPT_FORBID_REUSE, true);
         $request_headers[] = 'Connection: close';
-        curl_setopt( $ch, CURLOPT_HTTPHEADER, $request_headers );
+        curl_setopt($ch, CURLOPT_HTTPHEADER, $request_headers);
 
         curl_setopt($ch, CURLOPT_FAILONERROR, 1);
         //执行重定向获取
         $ret = $this->curlExecFollow($ch, 2);
 
-        if($isimg){
-            $mime=curl_getinfo($ch, CURLINFO_CONTENT_TYPE);
-            $mimeArray=explode('/',$mime);
+        if ($isimg) {
+            $img_info = @getimagesize($url);
+            if (empty($img_info)) {
+                $ret = '';
+                $this->_log_message("不是图片：{$url}");
+            }
+            $mime      = curl_getinfo($ch, CURLINFO_CONTENT_TYPE);
+            $mimeArray = explode('/', $mime);
         }
         $arr = array(
             'status'   => 'FAIL',
             'data'     => '',
             'real_url' => ''
         );
-        if(!$isimg ||  $mimeArray[0] == 'image'){
+        if (!$isimg || $mimeArray[0] == 'image') {
             if ($ret != false) {
                 $status = curl_getinfo($ch, CURLINFO_HTTP_CODE);
 
                 $arr = array(
-                    'status'   => ($status >= 200 && $status <= 299) ? 'OK' : 'FAIL',
+                    'code'     => $status,
+                    'status'   => ($status >= 200 && $status <= 399) ? "OK" : "FAIL",
                     'data'     => $ret,
                     'real_url' => curl_getinfo($ch, CURLINFO_EFFECTIVE_URL)
                 );
@@ -515,7 +527,7 @@ class Favicon
             curl_close($ch);
 
             return $arr;
-        }else{
+        } else {
             $this->_log_message("不是图片：{$url}");
             return $arr;
         }
@@ -531,33 +543,34 @@ class Favicon
      * @param int      $maxredirect 最大允许的重定向次数
      * @return string
      */
-    private function curlExecFollow( &$ch, $maxredirect = null) { 
-        $mr = $maxredirect === null ? 5 : intval($maxredirect); 
-        if (ini_get('open_basedir') == '' && ini_get('safe_mode' == 'Off')) { 
-            curl_setopt($ch, CURLOPT_FOLLOWLOCATION, $mr > 0); 
-            curl_setopt($ch, CURLOPT_MAXREDIRS, $mr); 
-        } else { 
-            curl_setopt($ch, CURLOPT_FOLLOWLOCATION, false); 
-            if ($mr > 0) { 
-                $newurl = curl_getinfo($ch, CURLINFO_EFFECTIVE_URL); 
-    
-                $rch = curl_copy_handle($ch); 
-                curl_setopt($rch, CURLOPT_HEADER, true); 
-                curl_setopt($rch, CURLOPT_NOBODY, true); 
+    private function curlExecFollow(&$ch, $maxredirect = null)
+    {
+        $mr = $maxredirect === null ? 5 : intval($maxredirect);
+        if (ini_get('open_basedir') == '' && ini_get('safe_mode' == 'Off')) {
+            curl_setopt($ch, CURLOPT_FOLLOWLOCATION, $mr > 0);
+            curl_setopt($ch, CURLOPT_MAXREDIRS, $mr);
+        } else {
+            curl_setopt($ch, CURLOPT_FOLLOWLOCATION, false);
+            if ($mr > 0) {
+                $newurl = curl_getinfo($ch, CURLINFO_EFFECTIVE_URL);
+
+                $rch = curl_copy_handle($ch);
+                curl_setopt($rch, CURLOPT_HEADER, true);
+                curl_setopt($rch, CURLOPT_NOBODY, true);
                 curl_setopt($rch, CURLOPT_NOSIGNAL, 1);
-                curl_setopt($rch, CURLOPT_CONNECTTIMEOUT_MS, 800); 
-                curl_setopt($rch, CURLOPT_FORBID_REUSE, false); 
-                curl_setopt($rch, CURLOPT_RETURNTRANSFER, true); 
-                do { 
-                    curl_setopt($rch, CURLOPT_URL, $newurl); 
-                    $header = curl_exec($rch); 
-                    if (curl_errno($rch)) { 
-                        $code = 0; 
-                    } else { 
-                        $code = curl_getinfo($rch, CURLINFO_HTTP_CODE); 
-                        if ($code == 301 || $code == 302) { 
-                            preg_match('/Location:(.*?)\n/', $header, $matches); 
-                            $newurl = trim(array_pop($matches)); 
+                curl_setopt($rch, CURLOPT_CONNECTTIMEOUT_MS, 800);
+                curl_setopt($rch, CURLOPT_FORBID_REUSE, false);
+                curl_setopt($rch, CURLOPT_RETURNTRANSFER, true);
+                do {
+                    curl_setopt($rch, CURLOPT_URL, $newurl);
+                    $header = curl_exec($rch);
+                    if (curl_errno($rch)) {
+                        $code = 0;
+                    } else {
+                        $code = curl_getinfo($rch, CURLINFO_HTTP_CODE);
+                        if ($code == 301 || $code == 302) {
+                            preg_match('/Location:(.*?)\n/', $header, $matches);
+                            $newurl = trim(array_pop($matches));
                             /**
                              * 这里由于部分网站返回的 Location 的值可能是相对网址, 所以还需要做一步
                              * 转换成完整地址的操作
@@ -565,25 +578,25 @@ class Favicon
                              * @since v2.2.2
                              */
                             $newurl = $this->filterRelativeUrl($newurl, $this->params['origin_url']);
-                        } else { 
-                            $code = 0; 
-                        } 
-                    } 
-                } while ($code && --$mr); 
-                curl_close($rch); 
-                if (!$mr) { 
-                    if ($maxredirect === null) { 
-                        trigger_error('Too many redirects. When following redirects, libcurl hit the maximum amount.', E_USER_WARNING); 
-                    } else { 
-                        $maxredirect = 0; 
-                    } 
-                    return false; 
-                } 
-                curl_setopt($ch, CURLOPT_URL, $newurl); 
-            } 
-        } 
-        return curl_exec($ch); 
-    } 
+                        } else {
+                            $code = 0;
+                        }
+                    }
+                } while ($code && --$mr);
+                curl_close($rch);
+                if (!$mr) {
+                    if ($maxredirect === null) {
+                        trigger_error('Too many redirects. When following redirects, libcurl hit the maximum amount.', E_USER_WARNING);
+                    } else {
+                        $maxredirect = 0;
+                    }
+                    return false;
+                }
+                curl_setopt($ch, CURLOPT_URL, $newurl);
+            }
+        }
+        return curl_exec($ch);
+    }
 
     /**
      * 在设定的映射条件中循环并尝试匹配每一条规则，
@@ -611,7 +624,7 @@ class Favicon
     private function _log_message($message)
     {
         if ($this->debug_mode) {
-            error_log(date('d/m/Y H:i:s : ').$message.PHP_EOL,3, "./my-errors.log");
+            error_log(date('d/m/Y H:i:s : ') . $message . PHP_EOL, 3, "./my-errors.log");
         }
     }
 
diff --git a/config.php b/config.php
new file mode 100644
index 0000000..bc5ab02
--- /dev/null
+++ b/config.php
@@ -0,0 +1,6 @@
+<?php
+
+define( 'CACHE_DIR', 'cache' );          //缓存目录
+define( 'HASH_KEY', 'iowen' );           //加密密钥, 请修改并勿泄露
+define( 'DEFAULT_ICO', 'favicon.png' );  //默认图标路径
+define( 'EXPIRE', 2592000 );             //缓存有效期30天, 单位为:秒，为0时不缓存
diff --git a/get.php b/get.php
index d516ae3..1b38c57 100644
--- a/get.php
+++ b/get.php
@@ -2,28 +2,30 @@
 /**
  * getFavicon
  * @author    一为
- * @date      2019-11-27
+ * @date      2024-12-18
  * @link      https://www.iowen.cn
- * @version   1.2.0
+ * @version   1.2.1
  */
 
 if( !isset($_GET['url'])){
     return http_response_code(404);
 }
 
+require "./config.php"; // 配置文件
 require "./Favicon.php";
 
 $favicon = new \Jerrybendy\Favicon\Favicon;
 
+$cache_dir  = CACHE_DIR;
+$hash_key   = HASH_KEY;
+$defaultIco = DEFAULT_ICO;
+$expire     = EXPIRE;
 
-/* ------ 参数设置 ------ */
-
-$defaultIco='favicon.png';   //默认图标路径
-$expire = 2592000;           //缓存有效期30天, 单位为:秒，为0时不缓存
-
-/* ------ 参数设置 ------ */
-
-
+// 如果 HASH_KEY == iowen 则生成一个随机字符串，并更新config.php文件
+if (HASH_KEY == 'iowen') {
+    $hash_key = substr(hash('sha256', uniqid()), 0, 16);
+    file_put_contents('./config.php', str_replace('iowen', $hash_key, file_get_contents('./config.php')));
+}
 
 /**
  * 设置默认图标
@@ -39,23 +41,25 @@ $url = $_GET['url'];
  * 格式化 URL, 并尝试读取缓存
  */
 $formatUrl = $favicon->formatUrl($url);
-if($formatUrl){
-    if($expire == 0){
+if ($formatUrl) {
+    if ($expire == 0) {
         $favicon->getFavicon($formatUrl, false);
         exit;
     } else {
         $defaultMD5 = md5(file_get_contents($defaultIco));
+        $cache      = new Cache($hash_key, $cache_dir);
 
         /**
          * 2023-02-20
          * 增加刷新缓存参数：refresh=true 如：https://域名?url=www.iowen.cn&refresh=true
          */
-        if( !isset($_GET['refresh']) || ( isset($_GET['refresh']) && $_GET['refresh']!='true' ) ){
-            $data = Cache::get($formatUrl,$defaultMD5,$expire);
+        if (!isset($_GET['refresh']) || (isset($_GET['refresh']) && $_GET['refresh'] != 'true')) {
+            $data = $cache->get($formatUrl, $defaultMD5, $expire);
             if ($data !== NULL) {
                 foreach ($favicon->getHeader() as $header) {
                     @header($header);
                 }
+                header('X-Cache-Type: IO');
                 echo $data;
                 exit;
             }
@@ -64,13 +68,9 @@ if($formatUrl){
         /**
          * 缓存中没有指定的内容时, 重新获取内容并缓存起来
          */
-        $content = $favicon->getFavicon($formatUrl, TRUE);
+        $content = $favicon->getFavicon($formatUrl, true);
 
-        if( md5($content) == $defaultMD5 ){
-            $expire = 43200; //如果返回默认图标，设置过期时间为12小时。Cache::get 方法中需同时修改
-        }
-
-        Cache::set($formatUrl, $content, $expire);
+        $cache->set($formatUrl, $content);
 
         foreach ($favicon->getHeader() as $header) {
             @header($header);
@@ -79,7 +79,7 @@ if($formatUrl){
         echo $content;
         exit;
     }
-}else{
+} else {
     return http_response_code(404);
 }
 
@@ -88,64 +88,70 @@ if($formatUrl){
  */
 class Cache
 {
+    public $dir = 'cache'; //图标缓存目录
+
+    public $hash_key = 'iowen'; // 哈希密钥
+
+    public function __construct($hash_key, $dir = 'cache')
+    {
+        $this->hash_key = $hash_key;
+        $this->dir      = $dir;
+    }
+
     /**
      * 获取缓存的值, 不存在时返回 null
      *
-     * @param $key
-     * @param $default  默认图片
-     * @param $expire   过期时间
-     * @return string
+     * @param string $key      缓存键(URL)
+     * @param string $default  默认图片
+     * @param int    $expire   过期时间
+     * @return mixed
      */
-    public static function get($key, $default, $expire)
+    public function get($key, $default, $expire)
     {
-        $dir = 'cache'; //图标缓存目录
-       
-        //$f = md5( strtolower( $key ) );
-        $f = parse_url($key)['host'];
+        $host = strtolower(parse_url($key)['host']);
+        $hash = substr(hash_hmac('sha256', $host, $this->hash_key), 8, 16);
+        $f    = $host . '_' . $hash . '.txt';
+        $path = $this->dir . '/' . $f;
 
-        $a = $dir . '/' . $f . '.txt';
-
-        if(is_file($a)){
-            $data = file_get_contents($a);
-            if( md5($data) == $default ){
+        if (is_file($path)) {
+            $data = file_get_contents($path);
+            if (md5($data) == $default) {
                 $expire = 43200; //如果返回默认图标，过期时间为12小时。
             }
-            if( (time() - filemtime($a)) > $expire ){
+            if ((time() - filemtime($path)) > $expire) {
                 return null;
-            }
-            else{
+            } else {
                 return $data;
             }
-		}
-        else{
+        } else {
             return null;
         }
     }
 
     /**
      * 设置缓存
+     * 保存图标到缓存目录
      *
-     * @param $key
-     * @param $value
-     * @param $expire   过期时间
+     * @param string $key      缓存键(URL)
+     * @param string $value    缓存值(图标)
      */
-    public static function set($key, $value, $expire)
+    public function set($key, $value)
     {
-        $dir = 'cache'; //图标缓存目录
-        
-        //$f = md5( strtolower( $key ) );
-        $f = parse_url($key)['host'];
-
-        $a = $dir . '/' . $f . '.txt';
-        
         //如果缓存目录不存在则创建
-        if (!is_dir($dir)) mkdir($dir,0777,true) or die('创建缓存目录失败！');
-
-        if ( !is_file($a) || (time() - filemtime($a)) > $expire ) {
-            $imgdata = fopen($a, "w") or die("Unable to open file!");  //w  重写  a追加
-            fwrite($imgdata, $value);
-            fclose($imgdata); 
-            clearstatcache();
+        if (!is_dir($this->dir)) {
+            mkdir($this->dir, 0755, true) or die('创建缓存目录失败！');
         }
+
+        $host = strtolower(parse_url($key)['host']);
+        $hash = substr(hash_hmac('sha256', $host, $this->hash_key), 8, 16);
+        $f    = $host . '_' . $hash . '.txt';
+        $path = $this->dir . '/' . $f;
+
+        $imgdata = fopen($path, "w") or die("Unable to open file!");
+        if (flock($imgdata, LOCK_EX)) {  // 获取排他锁
+            fwrite($imgdata, $value);
+            flock($imgdata, LOCK_UN);  // 释放锁
+        }
+        fclose($imgdata);
     }
 }