> For AI agents: the complete documentation index is available at /zh/llms.txt, the full documentation bundle is available at /zh/llms-full.txt.

# entry.server.tsx

当项目开启 `server.ssr` 时，Modern.js 生成一个默认的 Server-Side 入口。示例代码如下：

```tsx title="entry.server.tsx"
import {
  renderString,
  createRequestHandler,
  type HandleRequest,
} from '@modern-js/runtime/ssr/server';

const handleRequest: HandleRequest = async (request, ServerRoot, options) => {
  const body = await renderString(request, <ServerRoot />, options);

  return new Response(body, {
    headers: {
      'content-type': 'text/html; charset=utf-8',
    },
  });
};

export default createRequestHandler(handleRequest);
```

## 添加自定义行为

如果用户需自定义 Server-Side Rendering 入口，可以在 `src/entry.server.ts`、`src/{entryName}/entry.server.ts` 中自定义 server 入口。

```tsx title="src/entry.server.tsx"
import {
  renderString,
  createRequestHandler,
  type HandleRequest,
} from '@modern-js/runtime/ssr/server';

const handleRequest: HandleRequest = async (request, ServerRoot, options) => {
  // do something before rendering
  const body = await renderString(request, <ServerRoot />, options);

  const newBody = body + '<div>Byte-Dance</div>';

  return new Response(newBody, {
    headers: {
      'content-type': 'text/html; charset=UTF-8',
      'x-custom-header': 'abc',
    },
  });
};

export default createRequestHandler(handleRequest);
```