# Puppeteer

Puppeteer needs two pieces: `--proxy-server` at launch, plus `page.authenticate()` for credentials.

## Basic setup

```js
import puppeteer from "puppeteer";

const browser = await puppeteer.launch({
  args: ["--proxy-server=http://gate.helodata.io:7777"],
});
const page = await browser.newPage();

await page.authenticate({
  username: "helo_s1a2b3c4d5e-type-res-region-us",
  password: "PASSWORD",
});

await page.goto("https://ipv4.icanhazip.com");
console.log(await page.content());
await browser.close();
```

`page.authenticate()` handles the proxy-auth dialog transparently.

## ISP

```js
const browser = await puppeteer.launch({
  args: ["--proxy-server=http://198.51.100.42:8000"],
});
await page.authenticate({ username: "helo_s1a2b3c4d5e", password: "PASSWORD" });
```

## Per-page proxy via `puppeteer-extra-plugin-proxy`

The official Puppeteer can't change proxy mid-session — once Chromium launches with `--proxy-server`, that's it. To rotate per-page, use the `puppeteer-page-proxy` plugin:

```bash
npm i puppeteer-extra puppeteer-extra-plugin-stealth puppeteer-page-proxy
```

```js
import puppeteer from "puppeteer-extra";
import StealthPlugin from "puppeteer-extra-plugin-stealth";
import useProxy from "puppeteer-page-proxy";

puppeteer.use(StealthPlugin());
const browser = await puppeteer.launch();
const page = await browser.newPage();

await useProxy(page, "http://helo_s1a2b3c4d5e-type-res-region-us:PASSWORD@gate.helodata.io:7777");
await page.goto("https://ipv4.icanhazip.com");
```

`useProxy()` can be called repeatedly to switch the page's proxy between requests.

## ISP rotation example

```js
import fs from "node:fs";
const list = fs.readFileSync("isp.txt", "utf8").trim().split("\n");
let i = 0;

async function fetchOne(url) {
  const line = list[i++ % list.length];
  const [ip, port, user, pass] = line.split(":");
  const p = `http://${user}:${pass}@${ip}:${port}`;
  await useProxy(page, p);
  await page.goto(url);
}
```

## Verify

```js
const ip = await page.evaluate(() =>
  fetch("https://ipv4.icanhazip.com").then(r => r.text())
);
console.log(ip.trim());
```

## Common pitfalls

* **`page.authenticate()` not set** before `page.goto()` — the first request will block on the auth dialog. Always call `authenticate()` immediately after `newPage()`.
* **`puppeteer-extra-plugin-stealth` masks the browser fingerprint** but does NOT change IP — combine with helodata for full coverage.
* **Same proxy across all pages** when using `--proxy-server` alone — for per-page proxies use the plugin above.


---

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