diff --git a/custom_components/xiaomi_home/config_flow.py b/custom_components/xiaomi_home/config_flow.py
index 1c3f12c..888b16e 100644
--- a/custom_components/xiaomi_home/config_flow.py
+++ b/custom_components/xiaomi_home/config_flow.py
@@ -1984,12 +1984,12 @@ async def _handle_oauth_webhook(hass, webhook_id, request):
         _LOGGER.info('webhook code: %s', data['code'])
 
         return web.Response(
-            body=oauth_redirect_page(
+            body=await oauth_redirect_page(
                 hass.config.language, 'success'), content_type='text/html')
 
     except MIoTConfigError:
         return web.Response(
-            body=oauth_redirect_page(hass.config.language, 'fail'),
+            body=await oauth_redirect_page(hass.config.language, 'fail'),
             content_type='text/html')
 
 
diff --git a/custom_components/xiaomi_home/miot/resource/oauth_redirect_page.html b/custom_components/xiaomi_home/miot/resource/oauth_redirect_page.html
new file mode 100644
index 0000000..293819e
--- /dev/null
+++ b/custom_components/xiaomi_home/miot/resource/oauth_redirect_page.html
@@ -0,0 +1,260 @@
+<html>
+
+<head>
+    <meta charset="UTF-8">
+    <meta name="viewport" content="width=device-width, initial-scale=1.0">
+    <link rel="icon" href="https://cdn.web-global.fds.api.mi-img.com/mcfe--mi-account/static/favicon_new.ico">
+    <link as="style"
+        href="https://font.sec.miui.com/font/css?family=MiSans:300,400,500,600,700:Chinese_Simplify,Chinese_Traditional,Latin&amp;display=swap"
+        rel="preload">
+    <title></title>
+    <style>
+        body {
+            background: white;
+            color: black;
+            display: flex;
+            justify-content: center;
+            align-items: center;
+            font-family: MiSans, -apple-system, BlinkMacSystemFont, Segoe UI, Roboto, Helvetica Neue, Arial, Noto Sans, sans-serif, Apple Color Emoji, Segoe UI Emoji, Segoe UI Symbol, Noto Color Emoji;
+        }
+
+        @media (prefers-color-scheme: dark) {
+            body {
+                background: black;
+                color: white;
+            }
+        }
+
+        .frame {
+            background: rgb(255 255 255 / 5%);
+            width: 360px;
+            padding: 40 45;
+            border-radius: 4px;
+            box-shadow: 0 20px 50px 0 hsla(0, 0%, 64%, .1);
+            text-align: center;
+        }
+
+        .logo-frame {
+            text-align: center;
+        }
+
+        .title-frame {
+            margin: 20px 0 20px 0;
+            font-size: 26px;
+            font-weight: 500;
+            line-height: 40px;
+            opacity: 0.8;
+        }
+
+        .content-frame {
+            font-size: 17px;
+            font-weight: 500;
+            line-height: 20px;
+            opacity: 0.8;
+        }
+
+        button {
+            margin-top: 20px;
+            background-color: #ff5c00;
+            border: none;
+            border-radius: 4px;
+            padding: 0 20px;
+            text-align: center;
+            width: 100%;
+            display: inline-block;
+            font-size: 18px;
+            font-weight: 400;
+            height: 60px;
+            line-height: 60px;
+            overflow: hidden;
+            position: relative;
+            text-overflow: ellipsis;
+            transition: all .3s cubic-bezier(.645, .045, .355, 1);
+            vertical-align: top;
+            white-space: nowrap;
+            cursor: pointer;
+            color: #fff;
+        }
+    </style>
+</head>
+
+<body>
+    <div class="frame">
+        <!-- XIAOMI LOGO-->
+        <div class="logo-frame">
+            <svg width="50" height="50" viewBox="0 0 193 193" xmlns="http://www.w3.org/2000/svg"
+                xmlns:xlink="http://www.w3.org/1999/xlink">
+                <title>编组</title>
+                <desc>Created with Sketch.</desc>
+                <defs>
+                    <polygon id="path-1"
+                        points="1.78097075e-14 0.000125324675 192.540685 0.000125324675 192.540685 192.540058 1.78097075e-14 192.540058">
+                    </polygon>
+                </defs>
+                <g id="\u9875\u9762-1" stroke="none" stroke-width="1" fill="none" fill-rule="evenodd">
+                    <g id="\u7F16\u7EC4">
+                        <mask id="mask-2" fill="white">
+                            <use xlink:href="#path-1"></use>
+                        </mask>
+                        <g id="Clip-2"></g>
+                        <path
+                            d="M172.473071,20.1164903 C154.306633,2.02148701 128.188344,-1.78097075e-14 96.2706558,-1.78097075e-14 C64.312237,-1.78097075e-14 38.155724,2.0452987 19.9974318,20.1872987 C1.84352597,38.3261656 1.78097075e-14,64.4406948 1.78097075e-14,96.3640227 C1.78097075e-14,128.286724 1.84352597,154.415039 20.0049513,172.556412 C38.1638701,190.704052 64.3141169,192.540058 96.2706558,192.540058 C128.225942,192.540058 154.376815,190.704052 172.53636,172.556412 C190.694653,154.409399 192.540685,128.286724 192.540685,96.3640227 C192.540685,64.3999643 190.672721,38.2553571 172.473071,20.1164903"
+                            id="Fill-1" fill="#FF6900" mask="url(#mask-2)"></path>
+                        <path
+                            d="M89.1841721,131.948836 C89.1841721,132.594885 88.640263,133.130648 87.9779221,133.130648 L71.5585097,133.130648 C70.8848896,133.130648 70.338474,132.594885 70.338474,131.948836 L70.338474,89.0100961 C70.338474,88.3584078 70.8848896,87.8251513 71.5585097,87.8251513 L87.9779221,87.8251513 C88.640263,87.8251513 89.1841721,88.3584078 89.1841721,89.0100961 L89.1841721,131.948836 Z"
+                            id="Fill-3" fill="#FFFFFF" mask="url(#mask-2)"></path>
+                        <path
+                            d="M121.332896,131.948836 C121.332896,132.594885 120.786481,133.130648 120.121633,133.130648 L104.492393,133.130648 C103.821906,133.130648 103.275491,132.594885 103.275491,131.948836 L103.275491,131.788421 L103.275491,94.9022357 C103.259198,88.4342292 102.889491,81.7863818 99.5502146,78.445226 C96.6790263,75.5652649 91.3251562,74.9054305 85.7557276,74.7669468 L57.4242049,74.7669468 C56.7555977,74.7669468 56.2154484,75.3045896 56.2154484,75.9512649 L56.2154484,128.074424 L56.2154484,131.948836 C56.2154484,132.594885 55.6640198,133.130648 54.9954127,133.130648 L39.3555198,133.130648 C38.6875393,133.130648 38.1498964,132.594885 38.1498964,131.948836 L38.1498964,60.5996188 C38.1498964,59.9447974 38.6875393,59.4121675 39.3555198,59.4121675 L84.4786692,59.4121675 C96.2717211,59.4121675 108.599909,59.9498104 114.680036,66.0380831 C120.786481,72.1533006 121.332896,84.4595571 121.332896,96.2657682 L121.332896,131.948836 Z"
+                            id="Fill-5" fill="#FFFFFF" mask="url(#mask-2)"></path>
+                        <path
+                            d="M153.53056,131.948836 C153.53056,132.594885 152.978505,133.130648 152.316164,133.130648 L136.678778,133.130648 C136.010797,133.130648 135.467515,132.594885 135.467515,131.948836 L135.467515,60.5996188 C135.467515,59.9447974 136.010797,59.4121675 136.678778,59.4121675 L152.316164,59.4121675 C152.978505,59.4121675 153.53056,59.9447974 153.53056,60.5996188 L153.53056,131.948836 Z"
+                            id="Fill-7" fill="#FFFFFF" mask="url(#mask-2)"></path>
+                    </g>
+                </g>
+            </svg>
+        </div>
+        <!-- TITLE -->
+        <div class="title-frame">
+            <a id="titleArea"></a>
+        </div>
+        <!-- CONTENT -->
+        <div class="content-frame">
+            <a id="contentArea"></a>
+        </div>
+        <!-- BUTTON -->
+        <button onClick="window.close();" id="buttonArea"></button>
+    </div>
+    <script>
+        // get language (user language -> system language)
+        const systemLanguage = 'LANG_PLACEHOLDER'; // DO NOT edit.
+        const locale = (localStorage.getItem('selectedLanguage') ?? systemLanguage).replaceAll('"', '');
+        const language = locale.split('-')[0].trim();
+        const status = 'STATUS_PLACEHOLDER'; // DO NOT edit.
+        console.log(locale);
+        /**
+         * @type {{
+         *      [locale: string] : {
+         *          success: {
+         *              title:string;
+         *              content:string;
+         *              button:string;
+         *          };
+         *          fail: {
+         *              title:string;
+         *              content:string;
+         *              button:string;
+         *          };
+         *      };
+         * }}
+         */
+        const translations = {
+            zh: {
+                success: {
+                    title: "认证完成",
+                    content: "请关闭此页面，返回账号认证页面点击“下一步”",
+                    button: "关闭页面"
+                },
+                fail: {
+                    title: "认证失败",
+                    content: "请关闭此页面，返回账号认证页面重新点击认链接进行认证。",
+                    button: "关闭页面"
+                }
+            },
+            'zh-Hant': {
+                success: {
+                    title: "認證完成",
+                    content: "請關閉此頁面，返回帳號認證頁面點擊「下一步」。",
+                    button: "關閉頁面"
+                },
+                fail: {
+                    title: "認證失敗",
+                    content: "請關閉此頁面，返回帳號認證頁面重新點擊認鏈接進行認證。",
+                    button: "關閉頁面"
+                }
+            },
+            en: {
+                success: {
+                    title: "Authentication Completed",
+                    content: "Please close this page and return to the account authentication page to click NEXT",
+                    button: "Close Page"
+                },
+                fail: {
+                    title: "Authentication Failed",
+                    content: "Please close this page and return to the account authentication page to click the authentication link again.",
+                    button: "Close Page"
+                }
+            },
+            fr: {
+                success: {
+                    title: "Authentification Terminée",
+                    content: "Veuillez fermer cette page et revenir à la page d'authentification du compte pour cliquer sur « SUIVANT »",
+                    button: "Fermer la page"
+                },
+                fail: {
+                    title: "Échec de l'Authentification",
+                    content: "Veuillez fermer cette page et revenir à la page d'authentification du compte pour cliquer de nouveau sur le lien d'authentification.",
+                    button: "Fermer la page"
+                }
+            },
+            ru: {
+                success: {
+                    title: "Подтверждение завершено",
+                    content: "Пожалуйста, закройте эту страницу, вернитесь на страницу аутентификации учетной записи и нажмите кнопку «Далее».",
+                    button: "Закрыть страницу"
+                },
+                fail: {
+                    title: "Ошибка аутентификации",
+                    content: "Пожалуйста, закройте эту страницу, вернитесь на страницу аутентификации учетной записи и повторите процесс аутентификации, щелкнув ссылку.",
+                    button: "Закрыть страницу"
+                }
+            },
+            de: {
+                success: {
+                    title: "Authentifizierung abgeschlossen",
+                    content: "Bitte schließen Sie diese Seite, kehren Sie zur Kontobestätigungsseite zurück und klicken Sie auf „WEITER“.",
+                    button: "Seite schließen"
+                },
+                fail: {
+                    title: "Authentifizierung fehlgeschlagen",
+                    content: "Bitte schließen Sie diese Seite, kehren Sie zur Kontobestätigungsseite zurück und wiederholen Sie den Authentifizierungsprozess, indem Sie auf den Link klicken.",
+                    button: "Seite schließen"
+                }
+            },
+            es: {
+                success: {
+                    title: "Autenticación completada",
+                    content: "Por favor, cierre esta página, regrese a la página de autenticación de la cuenta y haga clic en 'SIGUIENTE'.",
+                    button: "Cerrar página"
+                },
+                fail: {
+                    title: "Error de autenticación",
+                    content: "Por favor, cierre esta página, regrese a la página de autenticación de la cuenta y vuelva a hacer clic en el enlace de autenticación.",
+                    button: "Cerrar página"
+                }
+            },
+            ja: {
+                success: {
+                    title: "認証完了",
+                    content: "このページを閉じて、アカウント認証ページに戻り、「次」をクリックしてください。",
+                    button: "ページを閉じる"
+                },
+                fail: {
+                    title: "認証失敗",
+                    content: "このページを閉じて、アカウント認証ページに戻り、認証リンクを再度クリックしてください。",
+                    button: "ページを閉じる"
+                }
+            }
+        }
+        // insert translate into page / match order: locale > language > english
+        const translation = (translations[locale] ?? translations[language] ?? translations["en"])[status];
+        document.title = translation.title;
+        document.getElementById("titleArea").innerText = translation.title;
+        document.getElementById("contentArea").innerText = translation.content;
+        document.getElementById("buttonArea").innerText = translation.button;
+        window.opener = null;
+        window.open('', '_self');
+        window.close();
+    </script>
+</body>
+
+</html>
\ No newline at end of file
diff --git a/custom_components/xiaomi_home/miot/web_pages.py b/custom_components/xiaomi_home/miot/web_pages.py
index e4cde5a..b12eff1 100644
--- a/custom_components/xiaomi_home/miot/web_pages.py
+++ b/custom_components/xiaomi_home/miot/web_pages.py
@@ -46,237 +46,24 @@ off Xiaomi or its affiliates' products.
 MIoT redirect web pages.
 """
 
-# pylint: disable=line-too-long
+import os
+import asyncio
 
-def oauth_redirect_page(lang: str, status: str) -> str:
+_template = ""
+
+def _load_page_template():
+    path = os.path.join(
+        os.path.dirname(os.path.abspath(__file__)),
+        "resource/oauth_redirect_page.html")
+    with open(path, "r", encoding="utf-8") as f:
+        global _template
+        _template = f.read()
+
+async def oauth_redirect_page(lang: str, status: str) -> str:
     """Return oauth redirect page."""
-    return '''
-        <html>
-        <head>
-            <meta charset="UTF-8">
-            <meta name="viewport" content="width=device-width, initial-scale=1.0">
-            <link rel="icon" href="https://cdn.web-global.fds.api.mi-img.com/mcfe--mi-account/static/favicon_new.ico">
-            <link as="style"
-                href="https://font.sec.miui.com/font/css?family=MiSans:300,400,500,600,700:Chinese_Simplify,Chinese_Traditional,Latin&amp;display=swap"
-                rel="preload">
-            <title></title>
-            <style>
-                body {
-                    background: white;
-                    color: black;
-                    display: flex;
-                    justify-content: center;
-                    align-items: center;
-                    font-family: MiSans, -apple-system, BlinkMacSystemFont, Segoe UI, Roboto, Helvetica Neue, Arial, Noto Sans, sans-serif, Apple Color Emoji, Segoe UI Emoji, Segoe UI Symbol, Noto Color Emoji;
-                }
-                @media (prefers-color-scheme: dark) {
-                    body {
-                        background: black;
-                        color: white;
-                    }
-                }
-                .frame {
-                    background: rgb(255 255 255 / 5%);
-                    width: 360px;
-                    padding: 40 45;
-                    border-radius: 4px;
-                    box-shadow: 0 20px 50px 0 hsla(0, 0%, 64%, .1);
-                    text-align: center;
-                }
-                .logo-frame {
-                    text-align: center;
-                }
-                .title-frame {
-                    margin: 20px 0 20px 0;
-                    font-size: 26px;
-                    font-weight: 500;
-                    line-height: 40px;
-                    opacity: 0.8;
-                }
-                .content-frame {
-                    font-size: 17px;
-                    font-weight: 500;
-                    line-height: 20px;
-                    opacity: 0.8;
-                }
-                button {
-                    margin-top: 20px;
-                    background-color: #ff5c00;
-                    border: none;
-                    border-radius: 4px;
-                    padding: 0 20px;
-                    text-align: center;
-                    width: 100%;
-                    display: inline-block;
-                    font-size: 18px;
-                    font-weight: 400;
-                    height: 60px;
-                    line-height: 60px;
-                    overflow: hidden;
-                    position: relative;
-                    text-overflow: ellipsis;
-                    transition: all .3s cubic-bezier(.645, .045, .355, 1);
-                    vertical-align: top;
-                    white-space: nowrap;
-                    cursor: pointer;
-                    color: #fff;
-                }
-            </style>
-        </head>
-        <body>
-        <div class="frame">
-            <!-- XIAOMI LOGO-->
-            <div class="logo-frame">
-                <svg width="50" height="50" viewBox="0 0 193 193" xmlns="http://www.w3.org/2000/svg"
-                    xmlns:xlink="http://www.w3.org/1999/xlink"><title>编组</title>
-                    <desc>Created with Sketch.</desc>
-                    <defs>
-                        <polygon id="path-1"
-                                points="1.78097075e-14 0.000125324675 192.540685 0.000125324675 192.540685 192.540058 1.78097075e-14 192.540058"></polygon>
-                    </defs>
-                    <g id="\u9875\u9762-1" stroke="none" stroke-width="1" fill="none" fill-rule="evenodd">
-                        <g id="\u7F16\u7EC4">
-                            <mask id="mask-2" fill="white">
-                                <use xlink:href="#path-1"></use>
-                            </mask>
-                            <g id="Clip-2"></g>
-                            <path d="M172.473071,20.1164903 C154.306633,2.02148701 128.188344,-1.78097075e-14 96.2706558,-1.78097075e-14 C64.312237,-1.78097075e-14 38.155724,2.0452987 19.9974318,20.1872987 C1.84352597,38.3261656 1.78097075e-14,64.4406948 1.78097075e-14,96.3640227 C1.78097075e-14,128.286724 1.84352597,154.415039 20.0049513,172.556412 C38.1638701,190.704052 64.3141169,192.540058 96.2706558,192.540058 C128.225942,192.540058 154.376815,190.704052 172.53636,172.556412 C190.694653,154.409399 192.540685,128.286724 192.540685,96.3640227 C192.540685,64.3999643 190.672721,38.2553571 172.473071,20.1164903"
-                                id="Fill-1" fill="#FF6900" mask="url(#mask-2)"></path>
-                            <path d="M89.1841721,131.948836 C89.1841721,132.594885 88.640263,133.130648 87.9779221,133.130648 L71.5585097,133.130648 C70.8848896,133.130648 70.338474,132.594885 70.338474,131.948836 L70.338474,89.0100961 C70.338474,88.3584078 70.8848896,87.8251513 71.5585097,87.8251513 L87.9779221,87.8251513 C88.640263,87.8251513 89.1841721,88.3584078 89.1841721,89.0100961 L89.1841721,131.948836 Z"
-                                id="Fill-3" fill="#FFFFFF" mask="url(#mask-2)"></path>
-                            <path d="M121.332896,131.948836 C121.332896,132.594885 120.786481,133.130648 120.121633,133.130648 L104.492393,133.130648 C103.821906,133.130648 103.275491,132.594885 103.275491,131.948836 L103.275491,131.788421 L103.275491,94.9022357 C103.259198,88.4342292 102.889491,81.7863818 99.5502146,78.445226 C96.6790263,75.5652649 91.3251562,74.9054305 85.7557276,74.7669468 L57.4242049,74.7669468 C56.7555977,74.7669468 56.2154484,75.3045896 56.2154484,75.9512649 L56.2154484,128.074424 L56.2154484,131.948836 C56.2154484,132.594885 55.6640198,133.130648 54.9954127,133.130648 L39.3555198,133.130648 C38.6875393,133.130648 38.1498964,132.594885 38.1498964,131.948836 L38.1498964,60.5996188 C38.1498964,59.9447974 38.6875393,59.4121675 39.3555198,59.4121675 L84.4786692,59.4121675 C96.2717211,59.4121675 108.599909,59.9498104 114.680036,66.0380831 C120.786481,72.1533006 121.332896,84.4595571 121.332896,96.2657682 L121.332896,131.948836 Z"
-                                id="Fill-5" fill="#FFFFFF" mask="url(#mask-2)"></path>
-                            <path d="M153.53056,131.948836 C153.53056,132.594885 152.978505,133.130648 152.316164,133.130648 L136.678778,133.130648 C136.010797,133.130648 135.467515,132.594885 135.467515,131.948836 L135.467515,60.5996188 C135.467515,59.9447974 136.010797,59.4121675 136.678778,59.4121675 L152.316164,59.4121675 C152.978505,59.4121675 153.53056,59.9447974 153.53056,60.5996188 L153.53056,131.948836 Z"
-                                id="Fill-7" fill="#FFFFFF" mask="url(#mask-2)"></path>
-                        </g>
-                    </g>
-                </svg>
-            </div>
-            <!-- TITLE -->
-            <div class="title-frame">
-                <a id="titleArea"></a>
-            </div>
-            <!-- CONTENT -->
-            <div class="content-frame">
-                <a id="contentArea"></a>
-            </div>
-            <!-- BUTTON -->
-            <button onClick="window.close();" id="buttonArea"></button>
-        </div>
-        <script>
-            // get language (user language -> system language)
-            const locale = (localStorage.getItem('selectedLanguage')?? "''' + lang + '''").replaceAll('"','');
-            const language = locale.includes("-") ? locale.substring(0, locale.indexOf("-")).trim() : locale;
-            const status = "''' + status + '''";
-            console.log(locale);
-            // translation
-            let translation = {
-                zh: {
-                    success: {
-                        title: "认证完成",
-                        content: "请关闭此页面，返回账号认证页面点击“下一步”",
-                        button: "关闭页面"
-                    },
-                    fail: {
-                        title: "认证失败",
-                        content: "请关闭此页面，返回账号认证页面重新点击认链接进行认证。",
-                        button: "关闭页面"
-                    }
-                },
-                'zh-Hant': {
-                    success: {
-                        title: "認證完成",
-                        content: "請關閉此頁面，返回帳號認證頁面點擊「下一步」。",
-                        button: "關閉頁面"
-                    },
-                    fail: {
-                        title: "認證失敗",
-                        content: "請關閉此頁面，返回帳號認證頁面重新點擊認鏈接進行認證。",
-                        button: "關閉頁面"
-                    }
-                },
-                en: {
-                    success: {
-                        title: "Authentication Completed",
-                        content: "Please close this page and return to the account authentication page to click NEXT",
-                        button: "Close Page"
-                    },
-                    fail: {
-                        title: "Authentication Failed",
-                        content: "Please close this page and return to the account authentication page to click the authentication link again.",
-                        button: "Close Page"
-                    }
-                },
-                fr: {
-                    success: {
-                        title: "Authentification Terminée",
-                        content: "Veuillez fermer cette page et revenir à la page d'authentification du compte pour cliquer sur « SUIVANT »",
-                        button: "Fermer la page"
-                    },
-                    fail: {
-                        title: "Échec de l'Authentification",
-                        content: "Veuillez fermer cette page et revenir à la page d'authentification du compte pour cliquer de nouveau sur le lien d'authentification.",
-                        button: "Fermer la page"
-                    }
-                },
-                ru: {
-                    success: {
-                        title: "Подтверждение завершено",
-                        content: "Пожалуйста, закройте эту страницу, вернитесь на страницу аутентификации учетной записи и нажмите кнопку «Далее».",
-                        button: "Закрыть страницу"
-                    },
-                    fail: {
-                        title: "Ошибка аутентификации",
-                        content: "Пожалуйста, закройте эту страницу, вернитесь на страницу аутентификации учетной записи и повторите процесс аутентификации, щелкнув ссылку.",
-                        button: "Закрыть страницу"
-                    }
-                },
-                de: {
-                    success: {
-                        title: "Authentifizierung abgeschlossen",
-                        content: "Bitte schließen Sie diese Seite, kehren Sie zur Kontobestätigungsseite zurück und klicken Sie auf „WEITER“.",
-                        button: "Seite schließen"
-                    },
-                    fail: {
-                        title: "Authentifizierung fehlgeschlagen",
-                        content: "Bitte schließen Sie diese Seite, kehren Sie zur Kontobestätigungsseite zurück und wiederholen Sie den Authentifizierungsprozess, indem Sie auf den Link klicken.",
-                        button: "Seite schließen"
-                    }
-                },
-                es: {
-                    success: {
-                        title: "Autenticación completada",
-                        content: "Por favor, cierre esta página, regrese a la página de autenticación de la cuenta y haga clic en 'SIGUIENTE'.",
-                        button: "Cerrar página"
-                    },
-                    fail: {
-                        title: "Error de autenticación",
-                        content: "Por favor, cierre esta página, regrese a la página de autenticación de la cuenta y vuelva a hacer clic en el enlace de autenticación.",
-                        button: "Cerrar página"
-                    }
-                },
-                ja: {
-                    success: {
-                        title: "認証完了",
-                        content: "このページを閉じて、アカウント認証ページに戻り、「次」をクリックしてください。",
-                        button: "ページを閉じる"
-                    },
-                    fail: {
-                        title: "認証失敗",
-                        content: "このページを閉じて、アカウント認証ページに戻り、認証リンクを再度クリックしてください。",
-                        button: "ページを閉じる"
-                    }
-                }
-            }
-            // insert translate into page / match order: locale > language > english
-            document.title = translation[locale]?.[status]?.title ?? translation[language]?.[status]?.title ?? translation["en"]?.[status]?.title;
-            document.getElementById("titleArea").innerText = translation[locale]?.[status]?.title ?? translation[language]?.[status]?.title ?? translation["en"]?.[status]?.title;
-            document.getElementById("contentArea").innerText = translation[locale]?.[status]?.content ?? translation[language]?.[status]?.content ?? translation["en"]?.[status]?.content;
-            document.getElementById("buttonArea").innerText = translation[locale]?.[status]?.button ?? translation[language]?.[status]?.button ?? translation["en"]?.[status]?.button;
-            window.opener=null;
-            window.open('','_self');
-            window.close();
-        </script>
-        </body>
-        </html>
-    '''
+    if _template == "":
+        await asyncio.get_event_loop().run_in_executor(
+            None, _load_page_template)
+    web_page = _template.replace("LANG_PLACEHOLDER", lang)
+    web_page = web_page.replace("STATUS_PLACEHOLDER", status)
+    return web_page
