> ## Documentation Index
> Fetch the complete documentation index at: https://bun.ll1025.cn/llms.txt
> Use this file to discover all available pages before exploring further.

# Proxy HTTP requests using fetch()

In Bun, `fetch` supports sending requests through an HTTP or HTTPS proxy. Use it on corporate networks or when a request must come from a specific IP address.

```ts proxy.ts icon="https://mintcdn.com/span-inc/82N53aP7NFbaCVSl/icons/typescript.svg?fit=max&auto=format&n=82N53aP7NFbaCVSl&q=85&s=787d39d6a7d96d7f9540dc74344eba23" theme={null}
await fetch("https://example.com", {
  // The URL of the proxy server
  proxy: "https://username:password@proxy.example.com:8080",
});
```

***

The `proxy` option can be a URL string, a `URL` instance, or an object with `url` (a string or a `URL`) and optional `headers`. The URL can include the username and password if the proxy requires authentication. It can be `http://` or `https://`.

***

## Custom proxy headers

To send custom headers to the proxy server (for proxy authentication tokens or custom routing), use the object format:

```ts proxy-headers.ts icon="https://mintcdn.com/span-inc/82N53aP7NFbaCVSl/icons/typescript.svg?fit=max&auto=format&n=82N53aP7NFbaCVSl&q=85&s=787d39d6a7d96d7f9540dc74344eba23" theme={null}
await fetch("https://example.com", {
  proxy: {
    url: "https://proxy.example.com:8080",
    headers: {
      "Proxy-Authorization": "Bearer my-token",
      "X-Proxy-Region": "us-east-1",
    },
  },
});
```

The `headers` property accepts a plain object or a `Headers` instance. These headers are sent directly to the proxy server in `CONNECT` requests (for HTTPS targets) or in the proxy request (for HTTP targets).

If you provide a `Proxy-Authorization` header, it overrides any credentials in the proxy URL.

***

## Environment variables

To use the same proxy for all requests, set the `$HTTP_PROXY` or `$HTTPS_PROXY` environment variable to the proxy URL.

```sh terminal icon="terminal" theme={null}
HTTPS_PROXY=https://username:password@proxy.example.com:8080 bun run index.ts
```