diff --git a/chrome/config.js b/chrome/config.js
index 874a944d..13b7664d 100644
--- a/chrome/config.js
+++ b/chrome/config.js
@@ -17,9 +17,9 @@
  */
 
 /*jslint browser: true */
-/*global chrome: false, get_storage: false, set_storage: false, new_random_ip: false, new_sogou_auth_str: false */
-/*global setup_lite_header: false, setup_redirect: false, setup_normal_header: false, setup_proxy: false, setup_timezone: false, setup_extra_header: false */
-/*global clear_lite_header: false, clear_redirect: false, clear_normal_header: false, clear_proxy: false, clear_timezone: false */
+/*global chrome: false, get_storage: false, set_storage: false, new_random_ip: false */
+/*global setup_redirect: false, setup_header: false, setup_proxy: false, setup_timezone: false, setup_extra_header: false */
+/*global clear_redirect: false, clear_header: false, clear_proxy: false, clear_timezone: false */
 /*global ga_report_event: false, ga_report_ratio: false, ga_report_error: false */
 "use strict";
 
@@ -40,8 +40,6 @@ unblock_youku.header_extra_url_list = [
 
 unblock_youku.ip_addr = new_random_ip();
 console.log('ip addr: ' + unblock_youku.ip_addr);
-unblock_youku.sogou_auth = new_sogou_auth_str();
-console.log('sogou_auth: ' + unblock_youku.sogou_auth);
 
 unblock_youku.version = chrome.runtime.getManifest().version;
 // the lastest version to show NEW on the icon; it's usually a big update with new features
@@ -93,7 +91,7 @@ function clear_mode_settings(mode_name) {
     switch (mode_name) {
     case 'lite':
         // clear_timezone();
-        clear_lite_header();
+        clear_header();
         console.log('cleared settings for lite');
         break;
     case 'redirect':
@@ -103,7 +101,7 @@ function clear_mode_settings(mode_name) {
     case 'normal':
         // clear_timezone();
         clear_proxy();
-        clear_normal_header();
+        clear_header();
         console.log('cleared settings for normal');
         break;
     default:
@@ -119,14 +117,14 @@ function clear_mode_settings(mode_name) {
 function setup_mode_settings(mode_name) {
     switch (mode_name) {
     case 'lite':
-        setup_lite_header();
+        setup_header();
         // setup_timezone();
         break;
     case 'redirect':
         setup_redirect();
         break;
     case 'normal':
-        setup_normal_header();
+        setup_header();
         setup_proxy();
         // setup_timezone();
         break;
diff --git a/chrome/header.js b/chrome/header.js
index 79656fab..c6d1b589 100644
--- a/chrome/header.js
+++ b/chrome/header.js
@@ -16,38 +16,15 @@
  * along with this program. If not, see <http://www.gnu.org/licenses/>.
  */
 
-/*global chrome: false, unblock_youku: false, compute_sogou_tag: false */
+/*global chrome: false, unblock_youku: false */
 /*global ga_report_error: false */
 "use strict";
 
-function lite_header_modifier(details) {
-    details.requestHeaders.push({
-        name: 'X-Forwarded-For',
-        value: unblock_youku.ip_addr
-    }, {
-        name: 'Client-IP',
-        value: unblock_youku.ip_addr
-    });
 
-    return {requestHeaders: details.requestHeaders};
-}
-
-function normal_header_modifier(details) {
-    var timestamp = Math.round(details.timeStamp / 1000).toString(16);
-    var tag = compute_sogou_tag(timestamp, details.url);
-
-    console.log('t=' + timestamp + ' h=' + tag + ' ' + details.url);
+function header_modifier(details) {
+    console.log('Modify headers of ' + details.url);
 
     details.requestHeaders.push({
-        name: 'X-Sogou-Auth',
-        value: unblock_youku.sogou_auth
-    }, {
-        name: 'X-Sogou-Timestamp',
-        value: timestamp
-    }, {
-        name: 'X-Sogou-Tag',
-        value: tag
-    }, {
         name: 'X-Forwarded-For',
         value: unblock_youku.ip_addr
     }, {
@@ -58,56 +35,31 @@ function normal_header_modifier(details) {
     return {requestHeaders: details.requestHeaders};
 }
 
-function setup_lite_header() {
-    if (!chrome.webRequest.onBeforeSendHeaders.hasListener(lite_header_modifier)) {
-        chrome.webRequest.onBeforeSendHeaders.addListener(
-            lite_header_modifier,
-            {urls: unblock_youku.normal_url_list},  // the same url list as normal mode
-            ['requestHeaders', 'blocking']
-        );
-        console.log('lite_header_modifier is set');
-    } else {
-        var err_msg = 'lite_header_modifier is already there!';
-        console.error(err_msg);
-        ga_report_error('Unexpected Error', err_msg);
-    }
-}
 
-function setup_normal_header() {
-    if (!chrome.webRequest.onBeforeSendHeaders.hasListener(normal_header_modifier)) {
+function setup_header() {
+    if (!chrome.webRequest.onBeforeSendHeaders.hasListener(header_modifier)) {
         chrome.webRequest.onBeforeSendHeaders.addListener(
-            normal_header_modifier,
+            header_modifier,
             {
                 urls: unblock_youku.normal_url_list
             },
             ['requestHeaders', 'blocking']
         );
-        console.log('normal_header_modifier is set');
+        console.log('header_modifier is set');
     } else {
-        var err_msg = 'normal_header_modifer is already there!';
+        var err_msg = 'header_modifer is already there!';
         console.error(err_msg);
         ga_report_error('Unexpected Error', err_msg);
     }
 }
 
 
-function clear_lite_header() {
-    if (chrome.webRequest.onBeforeSendHeaders.hasListener(lite_header_modifier)) {
-        chrome.webRequest.onBeforeSendHeaders.removeListener(lite_header_modifier);
-        console.log('lite_header_modifier is removed');
-    } else {
-        var err_msg = 'lite_header_modifer is not there!';
-        console.error(err_msg);
-        ga_report_error('Unexpected Error', err_msg);
-    }
-}
-
-function clear_normal_header() {
-    if (chrome.webRequest.onBeforeSendHeaders.hasListener(normal_header_modifier)) {
-        chrome.webRequest.onBeforeSendHeaders.removeListener(normal_header_modifier);
-        console.log('normal_header_modifier is removed');
+function clear_header() {
+    if (chrome.webRequest.onBeforeSendHeaders.hasListener(header_modifier)) {
+        chrome.webRequest.onBeforeSendHeaders.removeListener(header_modifier);
+        console.log('header_modifier is removed');
     } else {
-        var err_msg = 'normal_header_modifier is not there!';
+        var err_msg = 'header_modifier is not there!';
         console.error(err_msg);
         ga_report_error('Unexpected Error', err_msg);
     }
diff --git a/manifest.json b/manifest.json
index 1c7b12ad..608a7451 100644
--- a/manifest.json
+++ b/manifest.json
@@ -1,6 +1,6 @@
 {
   "name": "Unblock Youku",
-  "version": "2.7.4.0",
+  "version": "2.7.4.1",
   "manifest_version": 2,
   "minimum_chrome_version": "25.0",
   "description": "__MSG_description__",
@@ -21,7 +21,6 @@
     "scripts": [
       "shared/urls.js",
       "shared/tools.js",
-      "shared/sogou.js",
       "chrome/pages/js/analytics.js",
       "chrome/storage.js",
       "chrome/header.js",