From 619cf6bc2e0252e7759c16962b182798afac4b4e Mon Sep 17 00:00:00 2001
From: "copilot-swe-agent[bot]" <198982749+Copilot@users.noreply.github.com>
Date: Sun, 18 Jan 2026 00:56:27 +0000
Subject: [PATCH 1/4] Initial plan


From 41ff746137b77dcfa0479511e0831f79f8a0fe9a Mon Sep 17 00:00:00 2001
From: "copilot-swe-agent[bot]" <198982749+Copilot@users.noreply.github.com>
Date: Sun, 18 Jan 2026 00:59:51 +0000
Subject: [PATCH 2/4] Add root page with language detection and redirect

Co-authored-by: huangyiirene <7665279+huangyiirene@users.noreply.github.com>
---
 packages/site/app/page.tsx | 63 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 63 insertions(+)
 create mode 100644 packages/site/app/page.tsx

diff --git a/packages/site/app/page.tsx b/packages/site/app/page.tsx
new file mode 100644
index 0000000..e289226
--- /dev/null
+++ b/packages/site/app/page.tsx
@@ -0,0 +1,63 @@
+import { redirect } from 'next/navigation';
+import { headers } from 'next/headers';
+import { siteConfig } from '@/lib/site-config';
+
+/**
+ * Root page that redirects to the appropriate language version
+ * Detects user's preferred language from Accept-Language header
+ */
+export default async function RootPage() {
+  const headersList = await headers();
+  const acceptLanguage = headersList.get('accept-language') || '';
+  
+  // Get configured languages and default language from site config
+  const availableLanguages = siteConfig.i18n.languages;
+  const defaultLanguage = siteConfig.i18n.defaultLanguage;
+  
+  // Parse Accept-Language header to find the best match
+  const preferredLanguage = detectPreferredLanguage(acceptLanguage, availableLanguages);
+  
+  // Redirect to the detected or default language
+  const targetLanguage = preferredLanguage || defaultLanguage;
+  redirect(`/${targetLanguage}/docs`);
+}
+
+/**
+ * Detect preferred language from Accept-Language header
+ * Returns the first available language that matches user preferences
+ */
+function detectPreferredLanguage(
+  acceptLanguage: string,
+  availableLanguages: string[]
+): string | null {
+  if (!acceptLanguage) {
+    return null;
+  }
+  
+  // Parse Accept-Language header
+  // Example: "en-US,en;q=0.9,zh-CN;q=0.8,zh;q=0.7"
+  const languages = acceptLanguage
+    .split(',')
+    .map(lang => {
+      const [code, qValue] = lang.trim().split(';q=');
+      const quality = qValue ? parseFloat(qValue) : 1.0;
+      // Extract primary language code (e.g., "en" from "en-US")
+      const primaryCode = code.split('-')[0].toLowerCase();
+      return { code: primaryCode, quality };
+    })
+    .sort((a, b) => b.quality - a.quality); // Sort by quality (preference)
+  
+  // Find first matching language that is available
+  for (const { code } of languages) {
+    // Check if the language code matches any available language
+    if (availableLanguages.includes(code)) {
+      return code;
+    }
+    // Special case: map 'zh' to 'cn'
+    if (code === 'zh' && availableLanguages.includes('cn')) {
+      return 'cn';
+    }
+  }
+  
+  return null;
+}

From 4b70311ca15ce8d24483dbe1e0658c9d434281eb Mon Sep 17 00:00:00 2001
From: "copilot-swe-agent[bot]" <198982749+Copilot@users.noreply.github.com>
Date: Sun, 18 Jan 2026 01:23:32 +0000
Subject: [PATCH 3/4] Implement homepage auto-redirect based on browser
 language

Co-authored-by: huangyiirene <7665279+huangyiirene@users.noreply.github.com>
---
 packages/site/app/page.tsx | 63 --------------------------------------
 packages/site/proxy.ts     | 30 ++++++++++++++++--
 2 files changed, 28 insertions(+), 65 deletions(-)
 delete mode 100644 packages/site/app/page.tsx

diff --git a/packages/site/app/page.tsx b/packages/site/app/page.tsx
deleted file mode 100644
index e289226..0000000
--- a/packages/site/app/page.tsx
+++ /dev/null
@@ -1,63 +0,0 @@
-import { redirect } from 'next/navigation';
-import { headers } from 'next/headers';
-import { siteConfig } from '@/lib/site-config';
-
-/**
- * Root page that redirects to the appropriate language version
- * Detects user's preferred language from Accept-Language header
- */
-export default async function RootPage() {
-  const headersList = await headers();
-  const acceptLanguage = headersList.get('accept-language') || '';
-  
-  // Get configured languages and default language from site config
-  const availableLanguages = siteConfig.i18n.languages;
-  const defaultLanguage = siteConfig.i18n.defaultLanguage;
-  
-  // Parse Accept-Language header to find the best match
-  const preferredLanguage = detectPreferredLanguage(acceptLanguage, availableLanguages);
-  
-  // Redirect to the detected or default language
-  const targetLanguage = preferredLanguage || defaultLanguage;
-  redirect(`/${targetLanguage}/docs`);
-}
-
-/**
- * Detect preferred language from Accept-Language header
- * Returns the first available language that matches user preferences
- */
-function detectPreferredLanguage(
-  acceptLanguage: string,
-  availableLanguages: string[]
-): string | null {
-  if (!acceptLanguage) {
-    return null;
-  }
-  
-  // Parse Accept-Language header
-  // Example: "en-US,en;q=0.9,zh-CN;q=0.8,zh;q=0.7"
-  const languages = acceptLanguage
-    .split(',')
-    .map(lang => {
-      const [code, qValue] = lang.trim().split(';q=');
-      const quality = qValue ? parseFloat(qValue) : 1.0;
-      // Extract primary language code (e.g., "en" from "en-US")
-      const primaryCode = code.split('-')[0].toLowerCase();
-      return { code: primaryCode, quality };
-    })
-    .sort((a, b) => b.quality - a.quality); // Sort by quality (preference)
-  
-  // Find first matching language that is available
-  for (const { code } of languages) {
-    // Check if the language code matches any available language
-    if (availableLanguages.includes(code)) {
-      return code;
-    }
-    // Special case: map 'zh' to 'cn'
-    if (code === 'zh' && availableLanguages.includes('cn')) {
-      return 'cn';
-    }
-  }
-  
-  return null;
-}
diff --git a/packages/site/proxy.ts b/packages/site/proxy.ts
index 7307cc8..905305c 100644
--- a/packages/site/proxy.ts
+++ b/packages/site/proxy.ts
@@ -1,10 +1,36 @@
 import { createI18nMiddleware } from 'fumadocs-core/i18n/middleware';
 import { i18n } from '@/lib/i18n';
+import { NextResponse, NextRequest, NextFetchEvent } from 'next/server';
 
-export default createI18nMiddleware(i18n);
+// Create fumadocs middleware
+const fumadocsMiddleware = createI18nMiddleware(i18n);
+
+export default function proxy(request: NextRequest, event: NextFetchEvent) {
+  const path = request.nextUrl.pathname;
+  
+  // Handle root path separately with custom language detection
+  if (path === '/') {
+    const acceptLanguage = request.headers.get('accept-language') || '';
+    
+    // Simple language detection: check if zh is in Accept-Language
+    if (acceptLanguage.toLowerCase().includes('zh')) {
+      // Redirect to Chinese docs
+      const url = request.nextUrl.clone();
+      url.pathname = '/cn/docs';
+      return NextResponse.redirect(url);
+    } else {
+      // Redirect to default language (English)
+      const url = request.nextUrl.clone();
+      url.pathname = '/en/docs';
+      return NextResponse.redirect(url);
+    }
+  }
+  
+  // For all other paths, pass through to fumadocs middleware
+  return fumadocsMiddleware(request, event);
+}
 
 export const config = {
   // Matcher ignoring `/_next/` and `/api/`
-  // You may need to adjust it to ignore static assets in `/public` folder
   matcher: ['/((?!api|_next/static|_next/image|favicon.ico|logo.svg).*)'],
 };

From b9548d0e7fa2c364a606832862d7a1f7db86b0ee Mon Sep 17 00:00:00 2001
From: "copilot-swe-agent[bot]" <198982749+Copilot@users.noreply.github.com>
Date: Sun, 18 Jan 2026 01:28:20 +0000
Subject: [PATCH 4/4] Add root page.tsx to enable middleware for homepage

Co-authored-by: huangyiirene <7665279+huangyiirene@users.noreply.github.com>
---
 packages/site/app/page.tsx | 11 +++++++++++
 1 file changed, 11 insertions(+)
 create mode 100644 packages/site/app/page.tsx

diff --git a/packages/site/app/page.tsx b/packages/site/app/page.tsx
new file mode 100644
index 0000000..cbde5a4
--- /dev/null
+++ b/packages/site/app/page.tsx
@@ -0,0 +1,11 @@
+import { redirect } from 'next/navigation';
+
+/**
+ * Root page - redirects are handled by proxy.ts middleware
+ * This page should never actually render as the middleware intercepts and redirects
+ * But Next.js requires a page component for the route to be recognized
+ */
+export default function RootPage() {
+  // Fallback redirect if middleware didn't handle it
+  redirect('/en/docs');
+}