diff --git a/src/App.js b/src/App.js
index 20be776..30783a9 100644
--- a/src/App.js
+++ b/src/App.js
@@ -82,14 +82,20 @@ class App extends Component {
                 <TokenCtx.Consumer>{(token)=>(
                     <div className="left-container">
                         <DeprecatedAlert token={token.value} />
+                        {!token.value &&
+                            <div className="flow-item-row aux-margin">
+                                <div className="box box-tip">
+                                    <p>点击右上角的 <span className="icon icon-login" /> 按钮登录</p>
+                                </div>
+                            </div>
+                        }
                         {this.inpku_flag||token.value ?
                             <Flow key={this.state.flow_render_key} show_sidebar={this.show_sidebar_bound}
                                   mode={this.state.mode} search_text={this.state.search_text} token={token.value}
                             /> :
-                            <div className="flow-item-row">
-                                <div className="box box-tip aux-margin">
-                                    <p>本网站仅限校内用户使用</p>
-                                    <p>请点击右上角的 <span className="icon icon-login" /> 按钮登录</p>
+                            <div className="flow-item-row aux-margin">
+                                <div className="box box-tip">
+                                    <p>本网站仅限校内用户使用，请登录后访问。</p>
                                 </div>
                             </div>
                         }
diff --git a/src/Title.js b/src/Title.js
index 13a713f..73d6c0f 100644
--- a/src/Title.js
+++ b/src/Title.js
@@ -114,7 +114,7 @@ class ControlBar extends PureComponent {
                     />
                     <a className="control-btn" onClick={()=>{
                         this.props.show_sidebar(
-                            'P大树洞 网页版',
+                            'P大树洞',
                             <div>
                                 <PromotionBar />
                                 <LoginForm show_sidebar={this.props.show_sidebar} />
diff --git a/src/UserAction.js b/src/UserAction.js
index c3f7f03..cef5341 100644
--- a/src/UserAction.js
+++ b/src/UserAction.js
@@ -35,18 +35,39 @@ export class LoginForm extends Component {
         if(this.state.loading_status==='loading')
             return;
 
-        let param=
-            'user='+this.username_ref.current.value+
-            '&svcId='+ISOP_SVCID+
-            '&appKey='+ISOP_APPKEY+
-            '&timestamp='+(+new Date());
-
-        fetch(
-            'https://isop.pku.edu.cn/svcpub/svc/oauth/validcode?'+param+
-            '&msg='+md5(param+ISOP_APPCODE),
-            {mode: 'no-cors'}
-        );
-        alert('如果学号存在，短信验证码将会发到您的手机上，请注意查收！');
+        this.setState({
+            loading_status: 'loading',
+        },()=>{
+            let param=
+                'user='+this.username_ref.current.value+
+                '&svcId='+ISOP_SVCID+
+                '&appKey='+ISOP_APPKEY+
+                '&timestamp='+(+new Date());
+
+            fetch(
+                PKUHELPER_ROOT+'isop_proxy/validcode?'+param+
+                '&msg='+md5(param+ISOP_APPCODE),
+            )
+                .then(get_json)
+                .then((json)=>{
+                    console.log(json);
+                    if(!json.success)
+                        throw new Error(JSON.stringify(json));
+
+                    alert(json.msg);
+                    this.setState({
+                        loading_status: 'done',
+                    });
+                })
+                .catch((e)=>{
+                    console.error(e);
+                    alert('发送失败。'+e);
+                    this.setState({
+                        loading_status: 'done',
+                    });
+                });
+
+        });
     }
 
     do_login(set_token) {
@@ -82,11 +103,11 @@ export class LoginForm extends Component {
                     });
                 })
                 .catch((e)=>{
+                    console.error(e);
                     alert('登录失败');
                     this.setState({
                         loading_status: 'done',
                     });
-                    console.error(e);
                 });
         });
     }
diff --git a/src/index.js b/src/index.js
index 4e0bd0d..d2f92bb 100644
--- a/src/index.js
+++ b/src/index.js
@@ -4,6 +4,9 @@ import './index.css';
 import App from './App';
 //import registerServiceWorker from './registerServiceWorker';
 
+if(window.location.search.indexOf('user_token=')!==-1)
+    window.history.replaceState({},'?','?');
+
 ReactDOM.render(<App />, document.getElementById('root'));
 //registerServiceWorker();
 if(navigator.serviceWorker && navigator.serviceWorker.getRegistrations)
diff --git a/src/infrastructure b/src/infrastructure
index 0447218..90ddcb4 160000
--- a/src/infrastructure
+++ b/src/infrastructure
@@ -1 +1 @@
-Subproject commit 044721854a2e35603e87254f943c5f359a319102
+Subproject commit 90ddcb4646282092a64703c6677273f0c882f113