diff --git a/website/config.toml b/website/config.toml
index 79a50ba0c..cea8d4a32 100644
--- a/website/config.toml
+++ b/website/config.toml
@@ -178,9 +178,8 @@ defaultContentLanguageInSubdir = true
     createIssueManually= true # If it is 'false', it is auto to make a Github issue when the administrators login.
     distractionFreeMode= true # Enable hot key (cmd|ctrl + enter) submit comment.
     # 登录代理：GitHub 的 /login/oauth/access_token 接口不返回 CORS 头，浏览器无法直接调用，必须经服务端中转。
-    # 原来的 Heroku 免费应用已停服，故改为指向本站同源路径，由服务器反向代理到 GitHub。
-    # 因为与站点同源(都是 books.halfrost.com)，浏览器不触发 CORS，最稳。
-    # 需要在服务器 web 配置里加一个反代到 https://github.com/login/oauth/access_token 的 location。
-    # 完整且修好 502(SNI) 的 nginx 配置见 website/deploy/nginx-gitalk-oauth.conf。
-    proxy= "https://books.halfrost.com/gitalk-oauth"
+    # 阿里云(大陆)服务器到 github.com 出网不稳定，nginx 直连会随机 502/504/404，配置再对也修不好。
+    # 故改用 Cloudflare Worker(边缘到 github 稳定)做 token 交换，绕开阿里云出网。
+    # Worker 源码见 website/deploy/gitalk-oauth-worker.js；nginx 直连方案(备用)见 website/deploy/nginx-gitalk-oauth.conf。
+    proxy= "https://gitalk-oauth.ydz627.workers.dev"
 
diff --git a/website/deploy/gitalk-oauth-worker.js b/website/deploy/gitalk-oauth-worker.js
new file mode 100644
index 000000000..ab94227b6
--- /dev/null
+++ b/website/deploy/gitalk-oauth-worker.js
@@ -0,0 +1,59 @@
+// Gitalk OAuth 代理 —— Cloudflare Worker 版
+// 用途：替代 nginx 直连 GitHub 的方案。当「服务器到 github.com 出网不稳定」(随机 502/504/404)时，
+//       把 token 交换放到 Cloudflare 边缘（到 github 稳定），彻底绕开你服务器的网络问题。
+//
+// 部署（二选一）：
+//   A. 仪表盘最简单：
+//      1. Cloudflare 控制台 → Workers & Pages → Create → Create Worker
+//      2. 把本文件内容整段贴进去 → Deploy
+//      3. 记下分配的地址，形如 https://gitalk-oauth.<你的子域>.workers.dev
+//   B. 命令行：npm i -g wrangler && wrangler deploy
+//
+// 部署后改一行 config.toml：
+//   [params.gitalk]
+//     proxy = "https://gitalk-oauth.<你的子域>.workers.dev"
+//   然后重新构建发布（npm run build）。
+//
+// 注意：Worker 与站点不同源，必须返回 CORS 头（下面已处理）；这点和原来的同源 nginx 代理不同。
+
+const GITHUB_TOKEN_URL = 'https://github.com/login/oauth/access_token';
+
+function corsHeaders() {
+  return {
+    'Access-Control-Allow-Origin': '*',
+    'Access-Control-Allow-Methods': 'POST, OPTIONS',
+    'Access-Control-Allow-Headers': 'Content-Type, Accept',
+  };
+}
+
+export default {
+  async fetch(request) {
+    // 预检请求
+    if (request.method === 'OPTIONS') {
+      return new Response(null, { headers: corsHeaders() });
+    }
+    if (request.method !== 'POST') {
+      return new Response(JSON.stringify({ error: 'method_not_allowed' }), {
+        status: 405,
+        headers: { 'Content-Type': 'application/json', ...corsHeaders() },
+      });
+    }
+
+    const body = await request.text();
+    const ghResp = await fetch(GITHUB_TOKEN_URL, {
+      method: 'POST',
+      headers: {
+        'Accept': 'application/json',
+        'Content-Type': request.headers.get('Content-Type') || 'application/json',
+        'User-Agent': 'gitalk-oauth-worker',
+      },
+      body,
+    });
+
+    const respBody = await ghResp.text();
+    return new Response(respBody, {
+      status: ghResp.status,
+      headers: { 'Content-Type': 'application/json', ...corsHeaders() },
+    });
+  },
+};
diff --git a/website/deploy/nginx-gitalk-oauth.conf b/website/deploy/nginx-gitalk-oauth.conf
index caf1b810d..44b15d5bd 100644
--- a/website/deploy/nginx-gitalk-oauth.conf
+++ b/website/deploy/nginx-gitalk-oauth.conf
@@ -1,58 +1,63 @@
 # Gitalk OAuth 反向代理 —— 修复点击「使用 GitHub 登录」报
-#   Error: Request failed with status code 502
+#   Error: Request failed with status code 502 / 504
 #
 # 背景：
 #   GitHub 的 token 接口 https://github.com/login/oauth/access_token 不返回 CORS 头，
 #   浏览器无法直接调用，必须由站点同源转发（config.toml 里 Gitalk.proxy =
 #   https://books.halfrost.com/gitalk-oauth 就是指这里）。
 #
-# 关于 502 的定位（重要）：
-#   经实测，GitHub 端一切正常——不带 SNI 也能握手，直接 POST 返回 200（incorrect_client_credentials
-#   的 JSON）。所以 502 是【本服务器侧】的故障，最常见两类：
-#     (1) 原来的 /gitalk-oauth 没有直连 GitHub，而是转发给一个本地中转程序
-#         (gatekeeper / cors-anywhere 之类的 node 应用)，该进程挂了 → nginx 502。
-#     (2) 服务器到 github.com 出网被阻断/重置（国内主机常见）→ upstream 连接失败 → 502。
-#   下面的配置改成【nginx 直连 GitHub】，可消除 (1)。若换上后仍 502，基本就是 (2)，
-#   请看文件末尾的「仍然 502 怎么办」。
+# 关于 502/504 的定位（重要）：
+#   GitHub 端一切正常（直接 POST 返回 200 的 incorrect_client_credentials JSON）。
+#   halfrost 的原配置里 proxy_pass 路径 / Host / SNI 都是对的，但仍间歇 502/504，
+#   根因在【上游连接健壮性】，按概率：
+#     (1) DNS 过期（最可能）：proxy_pass 用字面量 github.com 时，nginx 只在【启动时】解析一次 IP
+#         并一直沿用。GitHub 走 Fastly，IP 会轮换；启动时那个 IP 失效后 → 间歇 502/504。
+#         => 用 resolver + 变量改成【请求时实时解析】。
+#     (2) IPv6 陷阱：实时解析若返回 AAAA 而机器无 IPv6 出网 → 连接失败 502。=> resolver 加 ipv6=off。
+#     (3) HTTP 版本：默认 proxy_http_version 1.0，升 1.1 + Connection "" 更稳。
+#   下面这版把以上三点都处理了。若换上后仍 502/504，看文件末尾「仍然 502 怎么办」拿 error.log 定位。
 #
-# 用法：把下面的 location 放进 books.halfrost.com 的 server {} 块，然后
+# 用法：把 books.halfrost.com server{} 里现有的 location = /gitalk-oauth 整段替换为下面这段，然后
 #   nginx -t && nginx -s reload
 # 验证：
 #   curl -s -o /dev/null -w '%{http_code}\n' -X POST https://books.halfrost.com/gitalk-oauth \
 #        -H 'Accept: application/json' \
 #        -d 'client_id=x&client_secret=x&code=x'
-#   修好后应返回 200（GitHub 回 incorrect_client_credentials 的 JSON，但 HTTP 状态是 200），不再是 502。
+#   修好后应返回 200（GitHub 回 incorrect_client_credentials 的 JSON，但 HTTP 状态是 200），不再是 502/504。
 
 location = /gitalk-oauth {
-    proxy_http_version 1.1;
-    proxy_pass https://github.com/login/oauth/access_token;
+    # 请求时实时解析 github.com，避免 nginx 启动时缓存的 IP 轮换失效导致间歇 502/504；
+    # ipv6=off 防止返回 AAAA 而机器无 IPv6 出网导致连接失败。
+    resolver 1.1.1.1 8.8.8.8 valid=60s ipv6=off;
+    set $gh_oauth https://github.com/login/oauth/access_token;
+    proxy_pass $gh_oauth;
 
+    proxy_http_version 1.1;
+    proxy_set_header Connection "";
     proxy_set_header Host github.com;    # GitHub 按 Host 路由
-    proxy_ssl_server_name on;            # 发送 SNI（最佳实践；某些网络下必需）
+    proxy_ssl_server_name on;            # 发送 SNI
     proxy_ssl_name        github.com;
     proxy_ssl_protocols   TLSv1.2 TLSv1.3;
 
-    proxy_set_header X-Real-IP        $remote_addr;
-    proxy_set_header X-Forwarded-For  $proxy_add_x_forwarded_for;
-    proxy_set_header X-Forwarded-Proto $scheme;
     proxy_set_header Accept           application/json;
+    proxy_set_header X-Forwarded-For  $proxy_add_x_forwarded_for;
 
-    # 连接到 GitHub 慢/不稳时，给足超时，避免过早 502
-    proxy_connect_timeout 15s;
-    proxy_read_timeout    15s;
-
-    # 若改用变量形式的 proxy_pass（set $up https://github.com;）才需要显式 DNS：
-    # resolver 1.1.1.1 8.8.8.8 valid=300s;
+    proxy_connect_timeout 10s;
+    proxy_send_timeout    10s;
+    proxy_read_timeout    10s;
 }
 
-# ───────────────────────── 仍然 502 怎么办 ─────────────────────────
-# 先看真正的报错（关键）：
+# ───────────────────────── 仍然 502/504 怎么办 ─────────────────────────
+# 看真正的报错（关键，一句话就能定性）：
 #   tail -n 50 /var/log/nginx/error.log
+#   · "upstream timed out"            → 服务器到 github 出网慢/被拦（见下方 Cloudflare 兜底）
+#   · "no live upstreams" / "could not be resolved" → DNS 问题（确认 resolver 生效）
+#   · "SSL_do_handshake() failed"     → TLS/SNI 问题（确认 proxy_ssl_server_name on）
 # 再在【服务器上】直接测到 GitHub 的连通性：
 #   curl -v -m 15 -X POST https://github.com/login/oauth/access_token \
 #        -H 'Accept: application/json' -d 'client_id=x&client_secret=x&code=x'
-#   · 若服务器上这条 curl 也连不上/超时/reset → 是服务器出网到 github 的问题(上面的(2))，
-#     nginx 配置再怎么改都没用。此时改用下面的 Cloudflare Worker 兜底（部署在 GitHub 可达的边缘）。
+#   · 若服务器上这条 curl 也连不上/超时/reset → 是服务器出网到 github 的问题，
+#     nginx 配置再怎么改都没用，改用下面的 Cloudflare Worker 兜底（部署在 GitHub 可达的边缘）。
 #
 # ── 兜底方案：Cloudflare Worker（绕开本服务器出网，免费）──
 #   1. 在 Cloudflare 新建一个 Worker，代码：
diff --git a/website/package-lock.json b/website/package-lock.json
index 58aa3e10a..2cb8d2793 100644
--- a/website/package-lock.json
+++ b/website/package-lock.json
@@ -5,6 +5,9 @@
   "packages": {
     "": {
       "name": "leetcode-cookbook-website",
+      "dependencies": {
+        "puppeteer-core": "^25.2.1"
+      },
       "devDependencies": {
         "workbox-cli": "^7.3.0"
       }
@@ -1744,6 +1747,30 @@
         "node": ">=12"
       }
     },
+    "node_modules/@puppeteer/browsers": {
+      "version": "3.0.5",
+      "resolved": "https://bnpm.byted.org/@puppeteer/browsers/-/browsers-3.0.5.tgz",
+      "integrity": "sha512-xYXNuEQmHNIPWWcbL/skf2KF7seyp7c1xmKFRk3wmdFx7VwBsKVrtOLKs8ecaezsKPsWeF1YsgwIiElAscaryA==",
+      "license": "Apache-2.0",
+      "dependencies": {
+        "modern-tar": "^0.7.6",
+        "yargs": "^18.0.0"
+      },
+      "bin": {
+        "browsers": "lib/main-cli.js"
+      },
+      "engines": {
+        "node": ">=22.12.0"
+      },
+      "peerDependencies": {
+        "proxy-agent": ">=8.0.1"
+      },
+      "peerDependenciesMeta": {
+        "proxy-agent": {
+          "optional": true
+        }
+      }
+    },
     "node_modules/@rollup/plugin-babel": {
       "version": "6.1.0",
       "resolved": "https://bnpm.byted.org/@rollup/plugin-babel/-/plugin-babel-6.1.0.tgz",
@@ -2954,6 +2981,22 @@
         "fsevents": "~2.3.2"
       }
     },
+    "node_modules/chromium-bidi": {
+      "version": "16.0.1",
+      "resolved": "https://bnpm.byted.org/chromium-bidi/-/chromium-bidi-16.0.1.tgz",
+      "integrity": "sha512-J63PGu/9PpeCwLIcKYyzWP6yaVL5pxuBc0shlYCYM8BaAkmlwiQboXO1iNbOgSDbVklEyYFfNEcHD8oOAWacUA==",
+      "license": "Apache-2.0",
+      "dependencies": {
+        "mitt": "^3.0.1",
+        "zod": "^3.24.1"
+      },
+      "engines": {
+        "node": ">=20.19.0 <22.0.0 || >=22.12.0"
+      },
+      "peerDependencies": {
+        "devtools-protocol": "*"
+      }
+    },
     "node_modules/cli-boxes": {
       "version": "3.0.0",
       "resolved": "https://bnpm.byted.org/cli-boxes/-/cli-boxes-3.0.0.tgz",
@@ -3003,6 +3046,70 @@
         "node": ">= 10"
       }
     },
+    "node_modules/cliui": {
+      "version": "9.0.1",
+      "resolved": "https://bnpm.byted.org/cliui/-/cliui-9.0.1.tgz",
+      "integrity": "sha512-k7ndgKhwoQveBL+/1tqGJYNz097I7WOvwbmmU2AR5+magtbjPWQTS1C5vzGkBC8Ym8UWRzfKUzUUqFLypY4Q+w==",
+      "license": "ISC",
+      "dependencies": {
+        "string-width": "^7.2.0",
+        "strip-ansi": "^7.1.0",
+        "wrap-ansi": "^9.0.0"
+      },
+      "engines": {
+        "node": ">=20"
+      }
+    },
+    "node_modules/cliui/node_modules/ansi-regex": {
+      "version": "6.2.2",
+      "resolved": "https://bnpm.byted.org/ansi-regex/-/ansi-regex-6.2.2.tgz",
+      "integrity": "sha512-Bq3SmSpyFHaWjPk8If9yc6svM8c56dB5BAtW4Qbw5jHTwwXXcTLoRMkpDJp6VL0XzlWaCHTXrkFURMYmD0sLqg==",
+      "license": "MIT",
+      "engines": {
+        "node": ">=12"
+      },
+      "funding": {
+        "url": "https://github.com/chalk/ansi-regex?sponsor=1"
+      }
+    },
+    "node_modules/cliui/node_modules/emoji-regex": {
+      "version": "10.6.0",
+      "resolved": "https://bnpm.byted.org/emoji-regex/-/emoji-regex-10.6.0.tgz",
+      "integrity": "sha512-toUI84YS5YmxW219erniWD0CIVOo46xGKColeNQRgOzDorgBi1v4D71/OFzgD9GO2UGKIv1C3Sp8DAn0+j5w7A==",
+      "license": "MIT"
+    },
+    "node_modules/cliui/node_modules/string-width": {
+      "version": "7.2.0",
+      "resolved": "https://bnpm.byted.org/string-width/-/string-width-7.2.0.tgz",
+      "integrity": "sha512-tsaTIkKW9b4N+AEj+SVA+WhJzV7/zMhcSu78mLKWSk7cXMOSHsBKFWUs0fWwq8QyK3MgJBQRX6Gbi4kYbdvGkQ==",
+      "license": "MIT",
+      "dependencies": {
+        "emoji-regex": "^10.3.0",
+        "get-east-asian-width": "^1.0.0",
+        "strip-ansi": "^7.1.0"
+      },
+      "engines": {
+        "node": ">=18"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/sindresorhus"
+      }
+    },
+    "node_modules/cliui/node_modules/strip-ansi": {
+      "version": "7.2.0",
+      "resolved": "https://bnpm.byted.org/strip-ansi/-/strip-ansi-7.2.0.tgz",
+      "integrity": "sha512-yDPMNjp4WyfYBkHnjIRLfca1i6KMyGCtsVgoKe/z1+6vukgaENdgGBZt+ZmKPc4gavvEZ5OgHfHdrazhgNyG7w==",
+      "license": "MIT",
+      "dependencies": {
+        "ansi-regex": "^6.2.2"
+      },
+      "engines": {
+        "node": ">=12"
+      },
+      "funding": {
+        "url": "https://github.com/chalk/strip-ansi?sponsor=1"
+      }
+    },
     "node_modules/clone": {
       "version": "1.0.4",
       "resolved": "https://bnpm.byted.org/clone/-/clone-1.0.4.tgz",
@@ -3311,6 +3418,12 @@
         "url": "https://github.com/sponsors/ljharb"
       }
     },
+    "node_modules/devtools-protocol": {
+      "version": "0.0.1638949",
+      "resolved": "https://bnpm.byted.org/devtools-protocol/-/devtools-protocol-0.0.1638949.tgz",
+      "integrity": "sha512-mXwg4Fqnv0WR4iuAT/gYUmctNkjILwXFHyZ+m7Ty1dfr0ezZt2U3gnrrJTfRobJTHoXf+IbuFvFITzLrLFjwJA==",
+      "license": "BSD-3-Clause"
+    },
     "node_modules/dot-prop": {
       "version": "9.0.0",
       "resolved": "https://bnpm.byted.org/dot-prop/-/dot-prop-9.0.0.tgz",
@@ -3557,7 +3670,6 @@
       "version": "3.2.0",
       "resolved": "https://bnpm.byted.org/escalade/-/escalade-3.2.0.tgz",
       "integrity": "sha512-WUj2qlxaQtO4g6Pq5c29GTcWGDyd8itL8zTlipgECz3JesAiiOKotd8JU6otB3PACgG6xkJUyVhboMS+bje/jA==",
-      "dev": true,
       "license": "MIT",
       "engines": {
         "node": ">=6"
@@ -3873,11 +3985,19 @@
         "node": ">=6.9.0"
       }
     },
+    "node_modules/get-caller-file": {
+      "version": "2.0.5",
+      "resolved": "https://bnpm.byted.org/get-caller-file/-/get-caller-file-2.0.5.tgz",
+      "integrity": "sha512-DyFP3BM/3YHTQOCUL/w0OZHR0lpKeGrxotcHWcqNEdnltqFwXVfhEBQ94eIo34AfQpo0rGki4cyIiftY06h2Fg==",
+      "license": "ISC",
+      "engines": {
+        "node": "6.* || 8.* || >= 10.*"
+      }
+    },
     "node_modules/get-east-asian-width": {
       "version": "1.6.0",
       "resolved": "https://bnpm.byted.org/get-east-asian-width/-/get-east-asian-width-1.6.0.tgz",
       "integrity": "sha512-QRbvDIbx6YklUe6RxeTeleMR0yv3cYH6PsPZHcnVn7xv7zO1BHN8r0XETu8n6Ye3Q+ahtSarc3WgtNWmehIBfA==",
-      "dev": true,
       "license": "MIT",
       "engines": {
         "node": ">=18"
@@ -5208,6 +5328,21 @@
         "node": ">=16 || 14 >=14.17"
       }
     },
+    "node_modules/mitt": {
+      "version": "3.0.1",
+      "resolved": "https://bnpm.byted.org/mitt/-/mitt-3.0.1.tgz",
+      "integrity": "sha512-vKivATfr97l2/QBCYAkXYDbrIWPM2IIKEl7YPhjCvKlG3kE2gm+uBo6nEXK3M5/Ffh/FLpKExzOQ3JJoJGFKBw==",
+      "license": "MIT"
+    },
+    "node_modules/modern-tar": {
+      "version": "0.7.6",
+      "resolved": "https://bnpm.byted.org/modern-tar/-/modern-tar-0.7.6.tgz",
+      "integrity": "sha512-sweCIVXzx1aIGTCdzcMlSZt1h8k5Tmk08VNAuRk3IU28XamGiOH5ypi11g6De2CH7PhYqSSnGy2A/EFhbWnVKg==",
+      "license": "MIT",
+      "engines": {
+        "node": ">=18.0.0"
+      }
+    },
     "node_modules/ms": {
       "version": "2.1.3",
       "resolved": "https://bnpm.byted.org/ms/-/ms-2.1.3.tgz",
@@ -5584,6 +5719,23 @@
         "url": "https://github.com/sponsors/sindresorhus"
       }
     },
+    "node_modules/puppeteer-core": {
+      "version": "25.2.1",
+      "resolved": "https://bnpm.byted.org/puppeteer-core/-/puppeteer-core-25.2.1.tgz",
+      "integrity": "sha512-MwEZ4FFGJ1ZLOmu/04eISxoEMKtCnHyJBRFfgpwPPSYNG6gT6Xw1laNziFSV7uwDcx3jK+ATYIo9SfOd8Uhc3w==",
+      "license": "Apache-2.0",
+      "dependencies": {
+        "@puppeteer/browsers": "3.0.5",
+        "chromium-bidi": "16.0.1",
+        "devtools-protocol": "0.0.1638949",
+        "typed-query-selector": "^2.12.2",
+        "webdriver-bidi-protocol": "0.4.2",
+        "ws": "^8.21.0"
+      },
+      "engines": {
+        "node": ">=22.12.0"
+      }
+    },
     "node_modules/quick-lru": {
       "version": "4.0.1",
       "resolved": "https://bnpm.byted.org/quick-lru/-/quick-lru-4.0.1.tgz",
@@ -6753,6 +6905,12 @@
         "url": "https://github.com/sponsors/ljharb"
       }
     },
+    "node_modules/typed-query-selector": {
+      "version": "2.12.2",
+      "resolved": "https://bnpm.byted.org/typed-query-selector/-/typed-query-selector-2.12.2.tgz",
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@@ -6960,6 +7118,12 @@
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@@ -7481,6 +7639,27 @@
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@@ -7494,6 +7673,15 @@
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@@ -7501,6 +7689,23 @@
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@@ -7514,6 +7719,74 @@
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 }
diff --git a/website/package.json b/website/package.json
index cd416e1bc..35dfe0c0d 100644
--- a/website/package.json
+++ b/website/package.json
@@ -9,5 +9,8 @@
   },
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 }
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-    proxy: 'https:\/\/books.halfrost.com\/gitalk-oauth' 
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-    proxy: 'https:\/\/books.halfrost.com\/gitalk-oauth' 
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new file mode 100644
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@@ -0,0 +1,51 @@
+const cacheName = self.location.pathname
+const pages = [
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+        .then((cache) => cache.put(request, response.clone()))
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+      return response;
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+
+  /**
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+  function serveFromCache(error) {
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+
+  /**
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+  function cacheable(response) {
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+
+  event.respondWith(fetch(request).then(saveToCache).catch(serveFromCache));
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@@ -0,0 +1 @@
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index 35ea78ffc..bdc43c0ec 100644
--- a/website/public/zh/ChapterTwo/Two_Pointers/index.html
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diff --git a/website/public/zh/ChapterTwo/Union_Find/index.html b/website/public/zh/ChapterTwo/Union_Find/index.html
index 0838fcb3b..7dc3b5799 100644
--- a/website/public/zh/ChapterTwo/Union_Find/index.html
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index c3d977c83..c768ff8ec 100644
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-    proxy: 'https:\/\/books.halfrost.com\/gitalk-oauth' 
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diff --git a/website/public/zh/categories/index.html b/website/public/zh/categories/index.html
index a6c61ef2c..bef8f3178 100644
--- a/website/public/zh/categories/index.html
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@@ -12278,7 +12278,7 @@
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     body: location.href, 
-    proxy: 'https:\/\/books.halfrost.com\/gitalk-oauth' 
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diff --git a/website/public/zh/index.html b/website/public/zh/index.html
index fb319d945..1a3027d19 100644
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-    proxy: 'https:\/\/books.halfrost.com\/gitalk-oauth' 
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diff --git a/website/public/zh/tags/index.html b/website/public/zh/tags/index.html
index 1fce27317..a7cd12fe7 100644
--- a/website/public/zh/tags/index.html
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