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‎.gitignore

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/node_modules

‎.vscode/settings.json

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{
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"editor.formatOnSave": true,
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"editor.defaultFormatter": "esbenp.prettier-vscode"
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}

‎README.md

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# Next Rewrites Test
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This repository is intended to verify that the host header is properly passed when reverse proxying another web server in a Next.js project.
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This repository consists of three projects:
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- `edge-middleware` - This project uses the [edge middleware feature](https://nextjs.org/docs/app/building-your-application/routing/middleware) to return the content from `localhost:4000/foo` when accessed via `localhost:3000/foo`.
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- `nextjs-rewrites` - This project accomplishes the same task as the above using the [rewrites feature of the Next.js config.](https://nextjs.org/docs/pages/api-reference/next-config-js/rewrites)
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- `rewrite-target` - This project provides an API at `localhost:4000/foo` that returns whatever host header it receives.
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## How to run
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```sh
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pnpm install
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pnpm dev:edge-middleware # or pnpm dev:nextjs-rewrites
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open http://localhost:3000/foo
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```

‎edge-middleware/.gitignore

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# See https://help.github.com/articles/ignoring-files/ for more about ignoring files.
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# dependencies
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/node_modules
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/.pnp
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.pnp.js
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.yarn/install-state.gz
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# testing
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/coverage
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# next.js
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/.next/
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/out/
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# production
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/build
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# misc
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.DS_Store
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*.pem
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# debug
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npm-debug.log*
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yarn-debug.log*
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yarn-error.log*
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# local env files
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.env*.local
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# vercel
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.vercel
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# typescript
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*.tsbuildinfo
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next-env.d.ts

‎edge-middleware/app/layout.tsx

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import * as React from "react";
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export default function Layout({ children }: React.PropsWithChildren) {
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return (
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<html>
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<body>{children}</body>
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</html>
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);
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}

‎edge-middleware/app/page.tsx

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export default function Page() {
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return null;
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}

‎edge-middleware/middleware.ts

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import { NextRequest, NextResponse } from "next/server";
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export const config = {
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matcher: ["/foo"],
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};
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export default function middleware({ nextUrl, headers }: NextRequest) {
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const url = new URL(nextUrl);
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url.hostname = "localhost";
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url.port = "4000";
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// localhost:3000. Seems this header is ignored.
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console.log(headers.get("host"));
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return NextResponse.rewrite(url, { headers });
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}

‎edge-middleware/next.config.mjs

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/** @type {import('next').NextConfig} */
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const nextConfig = {};
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export default nextConfig;

‎edge-middleware/package.json

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{
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"name": "edge-middleware",
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"scripts": {
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"dev": "next dev",
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"build": "next build",
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"start": "next start",
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"lint": "next lint"
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},
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"dependencies": {
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"react": "^18",
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"react-dom": "^18",
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"next": "14.2.2"
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},
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"devDependencies": {
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"typescript": "^5",
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"@types/node": "^20",
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"@types/react": "^18",
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"@types/react-dom": "^18"
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}
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}

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