The Anti-Bot Arms Race: How Modern Scraping APIs Bypass Cloudflare, DataDome, and Advanced Bot Detection in 2025

// COMMON DETECTION VECTORS
const detectedPatterns = {
  // Network Layer
  'User-Agent': 'Mozilla/5.0 (compatible; scrapy/2.5.0)',  // Generic/Outdated
  'Request_Headers': ['accept-encoding: gzip'],             // Missing headers
  'TLS_Fingerprint': 'JA3_HASH_abcdef123456',              // Known scraper signature
  'IP_Type': 'datacenter',                                 // Non-residential IP
  'ASN_Reputation': 'marked_abusive',                      // Blacklisted ASN

  // Behavioral Layer
  'Timing_Pattern': 'exactly_3.141s_between_requests',     // Perfect intervals
  'Mouse_Movement': 'none',                                // No cursor events
  'Keyboard_Input': 'none',                                // No typing events
  'Resource_Loading': 'instant',                          // Zero render time
  'Scroll_Behavior': 'none',                               // No natural scrolling

  // Fingerprint Layer
  'Canvas_Hash': 'identical_across_1000_requests',         // Same fingerprint
  'WebGL_Renderer': 'generic_renderer',                    // GPU inconsistencies
  'Font_Metrics': 'non-existent_variations',               // Missing OS fonts
  'Audio_Context': 'silent_browser',                       // No audio capability
};

const proxyStrategy = {
  // Tier 1: Residential Proxies (High Trust)
  residential: {
    sources: ['ISP_providers', 'mobile_carriers', 'home_networks'],
    rotation: 'session_based',              // Keep same IP for session
    geographic: 'match_target_geo',         // Geo-match target
    stickiness: '90-300_seconds',           // Natural session duration
    pool_size: '50M+_unique_IPs',           // Dev.me's advantage
  },

  // Tier 2: Mobile Proxies (4G/5G)
  mobile: {
    carriers: ['major_global_operators'],   // Real carrier networks
    device_fingerprint: 'varied_by_device', // Android/iOS mixing
    asn_rotation: 'carrier_specific',       // Rotate within carrier
    latency: 'natural_mobile_latency',      // 50-200ms variation
  },

  // Tier 3: Datacenter (Low Priority)
  datacenter: {
    providers: ['cloud_providers'],         // AWS, GCP, Azure
    only_for: 'non_protected_targets',      // Unprotected sites
    rotation: 'very_frequent',              // Every 1-2 requests
    headers: 'full_browser_simulation',     // Complete header sets
  }
};

// Realistic Browser Fingerprint Generation
const generateFingerprint = () => {
  const browsers = ['Chrome', 'Firefox', 'Safari', 'Edge'];
  const os = ['Windows 10', 'Windows 11', 'macOS 14', 'Ubuntu 22.04'];
  const hardware = generateRealisticHardware();

  return {
    // Core Browser Identity
    userAgent: buildRealisticUserAgent(randomElement(browsers), randomElement(os)),
    acceptLanguage: generateAcceptLanguage(targetCountry),
    acceptEncoding: 'gzip, deflate, br',

    // Canvas & WebGL Fingerprints
    canvasHash: generateCanvasFingerprint(hardware),
    webglRenderer: hardware.gpu.renderer,
    webglVendor: hardware.gpu.vendor,
    maxTextureSize: hardware.gpu.maxTextureSize,

    // Audio Context Fingerprint
    audioContext: {
      sampleRate: [44100, 48000][Math.floor(Math.random() * 2)],
      numberOfOutputs: 2,
      channelCount: 2,
    },

    // Hardware Fingerprint
    hardwareConcurrency: hardware.cpu.cores,        // 4-16 cores realistic range
    deviceMemory: hardware.memory.ram,              // 4-32GB realistic range
    screenResolution: hardware.display.resolution,
    colorDepth: 24,
    pixelRatio: hardware.display.pixelRatio,

    // Timing Fingerprints
      timezone: hardware.timezone,
    timezoneOffset: hardware.timezone.offset,
    timezoneName: hardware.timezone.iana,

    // Font Fingerprinting
    fonts: generateFontList(hardware.os),
    fontMetrics: calculateFontMetrics(hardware.os),
  };
};

// Human Behavior Simulation
const simulateHumanBehavior = async (page) => {
  // 1. Natural Page Load Delay
  await delay(gaussianRandom(2.5, 0.8));           // 2.5s ± 0.8s

  // 2. Realistic Mouse Movements
  await simulateMouseMovement(page, {
    pattern: 'bezier_curves',                    // Natural mouse paths
    speed: 'variable_acceleration',              // Speed variations
    pauses: 'occasional_stops',                  // Natural stopping points
    drift: 'micro_movements',                    // Small hand tremors
  });

  // 3. Scroll Behavior Simulation
  await simulateScrolling(page, {
    direction: 'gradual_down',
    speed: 'accelerating_pattern',
    pauses: ['content_points', 'random_stops'],
    momentum: 'physics_based',                  // Inertia simulation
  });

  // 4. Reading Time Simulation
  const readingSpeed = gaussianRandom(200, 50);  // WPM variation
  const contentLength = await analyzeContentLength(page);
  const naturalReadingTime = (contentLength / readingSpeed) * 60;

  await delay(naturalReadingTime * 0.8);        // 80% of reading time

  // 5. Keyboard Interaction (if forms)
  if (await hasForms(page)) {
    await simulateTyping(page, {
      speed: 'variable_wpm',                    // 60-100 WPM variation
      errors: 'realistic_typos',                // 1-3% error rate
      corrections: 'immediate_backspace',       // Natural error correction
      pauses: 'thinking_delays',                // Thought simulation
    });
  }
};