Stealth-patched Chromium

Patchright

Chromium launched with Patchright's anti-detection patches (leaner automation flags, no Runtime.enable leak). The patches apply on our side, so connect with ordinary Playwright.

Launch: POST https://starter.cdpfleet.com/patchright/session
Connect: chromium.connect(wsUrl, { headers: { 'x-api-key': KEY } })
Playwright client: 1.60.x
Versions now: release1.60.2
Required: proxy

Example

// npm install [email protected]
// Browsers run on cdpfleet, so no `npx playwright install` is needed.
import { chromium } from 'playwright';

const KEY = process.env.CDPFLEET_API_KEY;

// 1. Launch the browser
const res = await fetch('https://starter.cdpfleet.com/patchright/session', {
  method: 'POST',
  headers: { 'x-api-key': KEY, 'content-type': 'application/json' },
  body: JSON.stringify({
    proxy: 'http://user:[email protected]:8080',
    headless: 'new',
  }),
});
if (!res.ok) throw new Error(`launch failed: ${res.status} ${await res.text()}`);
const { wsUrl } = await res.json();

// 2. Connect and drive it
const browser = await chromium.connect(wsUrl, { headers: { 'x-api-key': KEY } });
const page = await browser.newPage();
await page.goto('https://example.com');
console.log(await page.title());
await browser.close(); // ends the session and stops billing

# pip install playwright==1.60.0 requests
# Browsers run on cdpfleet, so no `playwright install` is needed.
import os
import requests
from playwright.sync_api import sync_playwright

KEY = os.environ["CDPFLEET_API_KEY"]

# 1. Launch the browser
res = requests.post(
    "https://starter.cdpfleet.com/patchright/session",
    headers={"x-api-key": KEY},
    json={
        "proxy": "http://user:[email protected]:8080",
        "headless": "new",
    },
    timeout=60,
)
res.raise_for_status()
ws_url = res.json()["wsUrl"]

# 2. Connect and drive it
with sync_playwright() as p:
    browser = p.chromium.connect(ws_url, headers={"x-api-key": KEY})
    page = browser.new_page()
    page.goto("https://example.com")
    print(page.title())
    browser.close()  # ends the session and stops billing

// Maven: com.microsoft.playwright:playwright:1.60.0  and  com.google.code.gson:gson:2.11.0
// Run with PLAYWRIGHT_SKIP_BROWSER_DOWNLOAD=1: browsers run on cdpfleet.
import com.google.gson.JsonParser;
import com.microsoft.playwright.*;
import java.net.URI;
import java.net.http.*;
import java.util.Map;

public class Example {
  public static void main(String[] args) throws Exception {
    String key = System.getenv("CDPFLEET_API_KEY");

    // 1. Launch the browser
    String body = """
        {
          "proxy": "http://user:[email protected]:8080",
          "headless": "new"
        }
        """;
    HttpResponse<String> res = HttpClient.newHttpClient().send(
        HttpRequest.newBuilder(URI.create("https://starter.cdpfleet.com/patchright/session"))
            .header("x-api-key", key)
            .header("content-type", "application/json")
            .POST(HttpRequest.BodyPublishers.ofString(body))
            .build(),
        HttpResponse.BodyHandlers.ofString());
    if (res.statusCode() != 200) {
      throw new RuntimeException("launch failed: " + res.statusCode() + " " + res.body());
    }
    String wsUrl = JsonParser.parseString(res.body()).getAsJsonObject().get("wsUrl").getAsString();

    // 2. Connect and drive it
    try (Playwright playwright = Playwright.create()) {
      Browser browser = playwright.chromium().connect(wsUrl,
          new BrowserType.ConnectOptions().setHeaders(Map.of("x-api-key", key)));
      Page page = browser.newPage();
      page.navigate("https://example.com");
      System.out.println(page.title());
      browser.close(); // ends the session and stops billing
    }
  }
}

// dotnet add package Microsoft.Playwright --version 1.60.0
// Browsers run on cdpfleet, so no `playwright install` is needed.
using System.Net.Http.Json;
using System.Text;
using System.Text.Json;
using Microsoft.Playwright;

var key = Environment.GetEnvironmentVariable("CDPFLEET_API_KEY")!;

// 1. Launch the browser
using var http = new HttpClient();
http.DefaultRequestHeaders.Add("x-api-key", key);
var body = """
    {
      "proxy": "http://user:[email protected]:8080",
      "headless": "new"
    }
    """;
var res = await http.PostAsync("https://starter.cdpfleet.com/patchright/session",
    new StringContent(body, Encoding.UTF8, "application/json"));
if (!res.IsSuccessStatusCode)
    throw new Exception($"launch failed: {(int)res.StatusCode} {await res.Content.ReadAsStringAsync()}");
var wsUrl = (await res.Content.ReadFromJsonAsync<JsonElement>()).GetProperty("wsUrl").GetString()!;

// 2. Connect and drive it
using var playwright = await Playwright.CreateAsync();
var browser = await playwright.Chromium.ConnectAsync(wsUrl, new BrowserTypeConnectOptions
{
    Headers = new Dictionary<string, string> { ["x-api-key"] = key },
});
var page = await browser.NewPageAsync();
await page.GotoAsync("https://example.com");
Console.WriteLine(await page.TitleAsync());
await browser.CloseAsync(); // ends the session and stops billing

// go get github.com/playwright-community/[email protected]
//
// One-time driver setup (needs Node.js 18+): playwright-go can no longer download the
// 1.60.0 driver itself, so build it from npm and point PLAYWRIGHT_DRIVER_PATH at it:
//   mkdir -p ~/.cache/pw-driver-1.60.0 && cd ~/.cache/pw-driver-1.60.0 &&
//     curl -sL https://registry.npmjs.org/playwright-core/-/playwright-core-1.60.0.tgz | tar xz &&
//     ln -sf "$(command -v node)" node
//   export PLAYWRIGHT_DRIVER_PATH=~/.cache/pw-driver-1.60.0
// Browsers run on cdpfleet, so no browsers are downloaded (SkipInstallBrowsers).
package main

import (
	"encoding/json"
	"fmt"
	"io"
	"log"
	"net/http"
	"os"
	"strings"

	"github.com/playwright-community/playwright-go"
)

func main() {
	key := os.Getenv("CDPFLEET_API_KEY")

	// 1. Launch the browser
	body := `{
	  "proxy": "http://user:[email protected]:8080",
	  "headless": "new"
	}`
	req, _ := http.NewRequest("POST", "https://starter.cdpfleet.com/patchright/session", strings.NewReader(body))
	req.Header.Set("x-api-key", key)
	req.Header.Set("content-type", "application/json")
	res, err := http.DefaultClient.Do(req)
	if err != nil {
		log.Fatal(err)
	}
	defer res.Body.Close()
	if res.StatusCode != http.StatusOK {
		msg, _ := io.ReadAll(res.Body)
		log.Fatalf("launch failed: %s %s", res.Status, msg)
	}
	var session struct {
		WsURL string `json:"wsUrl"`
	}
	if err := json.NewDecoder(res.Body).Decode(&session); err != nil {
		log.Fatal(err)
	}

	// 2. Connect and drive it (Install fetches only the Playwright driver, once)
	opts := &playwright.RunOptions{SkipInstallBrowsers: true}
	if err := playwright.Install(opts); err != nil {
		log.Fatal(err)
	}
	pw, err := playwright.Run(opts)
	if err != nil {
		log.Fatal(err)
	}
	defer pw.Stop()
	browser, err := pw.Chromium.Connect(session.WsURL, playwright.BrowserTypeConnectOptions{
		Headers: map[string]string{"x-api-key": key},
	})
	if err != nil {
		log.Fatal(err)
	}
	page, err := browser.NewPage()
	if err != nil {
		log.Fatal(err)
	}
	if _, err := page.Goto("https://example.com"); err != nil {
		log.Fatal(err)
	}
	title, _ := page.Title()
	fmt.Println(title)
	browser.Close() // ends the session and stops billing
}

Want different options or a specific version? Open this browser in the code builder.

Launch options

Send these as the JSON body of the launch request. Everything is optional except proxy; unknown fields are ignored. Context options such as viewport, user agent or cookies are set client-side after connecting (browser.newContext({...})).

Option	Type	Default	What it does
`proxy`	`string \| object \| array`	none — required	A proxy URL (`http://user:pass@host:port`, `https://…`, `socks5://user:pass@host:port`; no scheme means `http://`), an object `{ "server": "http://host:port", "username": "…", "password": "…" }`, or a list of proxies used round-robin as a pool. SOCKS5 with authentication works on every browser. Required for every session: a launch without a proxy returns `400 proxy_required`, so your sessions never browse from our servers' own IPs. An unparseable proxy returns 400. Example: `"http://user:[email protected]:8080"`
`proxy_rules`	`array`	none	A list of `{ "name": "…", "hosts": [...], "proxy": "…" \| [...] }` rules. Requests to a host matching a rule use that rule's proxy (round-robin when it is a list); every other host uses `proxy`. Host patterns support `` wildcards, e.g. `.cdn.example.com` or `static.`. The optional `name` (up to 64 characters) labels the rule's traffic on your dashboard's Proxy traffic page and in its CSV export. Needs `proxy` to be set as the default route. Rules route through a proxy only; routing a host with no proxy (direct from our servers) is not available. The first matching rule wins — keep rules from overlapping so traffic is attributed to the right one. Example: `[{"name":"dc-assets","hosts":[".cloudfront.net","static.example.com"],"proxy":["http://u:[email protected]:4444","http://u:[email protected]:4444"]}]`
`inactivity_timeout`	`number \| string`	60s	The timer resets on any protocol traffic in either direction. A number of seconds (`90`, `1.5`) or a string with a unit: `500ms`, `45s`, `10m`, `2h` (digits only, no spaces or decimals). Clamped to 1 s – 24 h. An unparseable value silently falls back to the default. A slow page load through a proxy can produce no traffic for a while, so keep it at 60 s or more. Shared threads can lower it but not raise it above 60 s; dedicated threads can set up to 24 h. Never longer than the session's overall timeout. Example: `"2m"`
`overall_timeout`	`number \| string`	your plan's maximum session length (24 h)	A number of seconds (`90`, `1.5`) or a string with a unit: `500ms`, `45s`, `10m`, `2h` (digits only, no spaces or decimals). Clamped to 1 s – 24 h. An unparseable value silently falls back to the default. cdpfleet also caps it at your plan's maximum session length (24 h) and, for shared threads, at your remaining daily minutes. Example: `"30m"`
`headless`	`boolean \| "new" \| "shell"`	false (headful, on a virtual display)	`true` or `"new"` runs Chrome's new headless mode; `"shell"` runs the lightweight headless shell. Anything else — including `1` and `"false"` — runs headful on a virtual display, which is harder to detect and is billed as 2 threads (headless is 1). Example: `"new"`