# Stream a file as an HTTP Response

[`Bun.file()`](/runtime/file-io#reading-files-bun-file) accepts a path and returns a lazily-loaded `BunFile` instance, which you can pass directly to the `new Response` constructor.

```ts server.ts icon="/icons/typescript.svg"
const path = "/path/to/file.txt";
const file = Bun.file(path);
const resp = new Response(file);
```

---

Bun determines the `Content-Type` from the file extension and sets it on the `Response`.

```ts server.ts icon="/icons/typescript.svg"
new Response(Bun.file("./package.json")).headers.get("Content-Type");
// => application/json;charset=utf-8

new Response(Bun.file("./test.txt")).headers.get("Content-Type");
// => text/plain;charset=utf-8

new Response(Bun.file("./index.tsx")).headers.get("Content-Type");
// => text/javascript;charset=utf-8

new Response(Bun.file("./img.png")).headers.get("Content-Type");
// => image/png
```

---

Putting it all together with [`Bun.serve()`](/runtime/http/server).

```ts server.ts icon="/icons/typescript.svg"
// static file server
Bun.serve({
  async fetch(req) {
    const path = new URL(req.url).pathname;
    const file = Bun.file(path);
    return new Response(file);
  },
});
```

---

See [`Bun.write()`](/runtime/file-io#writing-files-bun-write).