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How to Bypass Kasada in 2025

8 min read

Kasada is widely considered one of the toughest anti-bot systems out there—and for good reason. If you’ve tried scraping a Kasada-protected site, you already know it doesn’t mess around. It doesn’t even bother with a CAPTCHA; instead, it blocks requests outright with stealthy, multilayered defenses. But that doesn’t mean it’s unbeatable.

After digging deep and testing various approaches, we’ve identified the three most effective ways to bypass Kasada in 2025:

  1. Use a Proxies (Premium Proxies)
  2. Rotate Real Request Headers
  3. Leverage Fortified Headless Browsers

Let’s break down what makes Kasada so effective at blocking bots—and how you can work around it.

What Is Kasada?

Kasada is a powerful Web Application Firewall (WAF) that uses advanced bot detection techniques to act as a gatekeeper between users and web servers. Every incoming request goes through Kasada’s proxy layer, where it’s evaluated in real time. If anything looks suspicious, it gets blocked on the spot.

The goal? Stop web scrapers before they ever reach the actual site.

Unlike traditional WAFs that rely on CAPTCHAs, Kasada takes a more aggressive stance by inspecting every request, often returning HTTP errors without any visible challenge.

Indicators of Kasada Protection

So, how do you know if Kasada is blocking your requests?

Here are some telltale signs:

  • Response Headers: Look for headers like x-kpsdk-ct, x-kpsdk-r, or x-kpsdk-c. These are unique to Kasada and signal that your request is being evaluated—or already denied.
  • 403 Forbidden Errors: This is one of Kasada’s go-to moves. If you’re seeing a 403, you’re likely facing a Kasada wall.
  • 429 Too Many Requests: Rate-limiting is another common tactic. Kasada might slow or stop your requests if it suspects bot-like behavior.

Even though these are the most frequent indicators, you might also see a range of status codes from the 400 or 500 series. Anything in the 400 range typically means the client (you) triggered the block. If it’s 500+, the problem might be coming from the server side—which can be harder to get around.

How Does Kasada Detect Bots?

Kasada uses a multi-layered detection system, combining behavior analysis, fingerprinting, and more. Let’s break down each one.

1. IP Address Reputation

Kasada doesn’t just look at where a request comes from—it evaluates how trustworthy that IP address is. If your IP has a scraping history or comes from a flagged source (like a data center), it’ll likely be blacklisted.

Even rotating IPs won’t guarantee success. Data center IPs are easy to spot. The better bet is to use high-quality residential or mobile proxies that look more like regular users.

Just don’t rotate them too predictably. Kasada is designed to detect patterns, and an IP rotation strategy that’s too frequent or robotic can raise red flags.

2. TLS Fingerprinting

TLS fingerprinting is a subtle but effective technique. It happens during the initial handshake between the client and server—basically, when they decide how to encrypt the connection.

Kasada watches this process closely. It looks at things like supported TLS versions and cipher suites to generate a unique fingerprint for each session. If your scraper's fingerprint doesn’t match what it expects from a real browser, your request could be flagged.

Most scraping tools can handle TLS—but not in the nuanced way a real browser does. That’s where detection happens.

3. HTTP Details

Kasada puts your request headers under the microscope.

It inspects things like:

  • User-Agent
  • Referer
  • Accept-Language
  • Header Order

Real browsers send these headers in a very specific way. If your headers are missing, inconsistent, or appear in the wrong order, Kasada may assume you’re a bot.

Outdated protocols like HTTP/1.1 can also stand out since most modern browsers use HTTP/2 or HTTP/3. The key here is precision—your headers need to match a real browser's behavior exactly.

4. JavaScript Fingerprinting

Kasada runs JavaScript challenges in the browser to create a fingerprint based on how your environment behaves. This includes checking things like:

  • Your browser’s navigator fields
  • Device specs
  • Runtime properties
  • Hardware capabilities

If your environment doesn’t execute JavaScript properly—or does so too quickly or too slowly—that’s a red flag.

To pass these challenges, you’ll need to mimic a full browser environment, which means either reverse-engineering the JS or using tools that can handle client-side rendering with accuracy.

5. Behavior Analysis

Here’s where Kasada really ups the game. It doesn’t just inspect your setup—it watches what you do.

If your scraper scrolls the page the exact same amount every time, clicks in predictable intervals, or fills out forms in milliseconds, Kasada will catch on.

It looks for subtle inconsistencies in user behavior. Real users act unpredictably; bots do not. If your interactions are too robotic, your scraper will be flagged.

1. Bypass Kasada With Rotating Proxies

The easiest and most scalable way to get past Kasada? Use high-quality rotating proxies—specifically residential and mobile proxies.

Residential and mobile proxy rotation is built to handle:

  • IP reputation management
  • Geographic diversity
  • ISP-level authenticity
  • Automatic failover when blocked

This approach takes care of all the heavy lifting so you can just focus on extracting the data you need. Whether you're scraping product listings, real estate data, or social media content, rotating proxies work behind the scenes to avoid Kasada's IP-based detection.

The key advantage? Kasada heavily relies on IP reputation scoring. Datacenter IPs get flagged quickly, but residential and mobile proxies appear as genuine users from real ISP networks. When one proxy gets blocked, your scraper automatically switches to the next one in rotation.

Here's an example of how you'd use rotating proxies to scrape a Kasada-protected site like Canada Goose:

import requests
import random
import time
from itertools import cycle

class ProxyRotator:
    def __init__(self, proxy_list):
        """
        Initialize with a list of high-quality residential/mobile proxies
        """
        self.proxy_list = proxy_list
        self.proxy_cycle = cycle(proxy_list)
        self.session = requests.Session()
        
    def get_next_proxy(self):
        """Get the next proxy in rotation"""
        return next(self.proxy_cycle)
    
    def scrape_with_proxy_rotation(self, url, max_retries=3):
        """
        Scrape Kasada-protected sites using rotating proxies
        """
        for attempt in range(max_retries):
            proxy = self.get_next_proxy()
            
            # Set up proxy configuration
            proxies = {
                'http': proxy,
                'https': proxy
            }
            
            # Real browser headers
            headers = {
                'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.36',
                'Accept': 'text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8',
                'Accept-Language': 'en-US,en;q=0.9',
                'Accept-Encoding': 'gzip, deflate, br',
                'Sec-CH-UA': '"Not_A Brand";v="8", "Chromium";v="120", "Google Chrome";v="120"',
                'Sec-CH-UA-Mobile': '?0',
                'Sec-CH-UA-Platform': '"Windows"',
                'Sec-Fetch-Dest': 'document',
                'Sec-Fetch-Mode': 'navigate',
                'Sec-Fetch-Site': 'none',
                'Upgrade-Insecure-Requests': '1',
                'Cache-Control': 'max-age=0'
            }
            
            try:
                print(f"Attempt {attempt + 1}: Using proxy {proxy}")
                
                # Add human-like delay
                time.sleep(random.uniform(2, 5))
                
                response = self.session.get(
                    url, 
                    headers=headers, 
                    proxies=proxies, 
                    timeout=30
                )
                
                # Check if Kasada blocked the request
                if self.is_kasada_blocked(response):
                    print(f"Proxy {proxy} blocked by Kasada, rotating...")
                    continue
                
                if response.status_code == 200:
                    print(f"Success with proxy: {proxy}")
                    return response.text
                    
            except requests.exceptions.RequestException as e:
                print(f"Proxy {proxy} failed: {e}")
                continue
                
        print("All proxy attempts failed")
        return None
    
    def is_kasada_blocked(self, response):
        """Check for Kasada blocking indicators"""
        kasada_headers = ['x-kpsdk-ct', 'x-kpsdk-r', 'x-kpsdk-c']
        
        # Check for Kasada headers
        for header in kasada_headers:
            if header in response.headers:
                return True
                
        # Check for blocking status codes
        if response.status_code in [403, 429, 406]:
            return True
            
        return False

# Usage example with residential proxies
residential_proxies = [
    'http://username:password@residential-proxy1.com:8000',
    'http://username:password@residential-proxy2.com:8001',
    'http://username:password@residential-proxy3.com:8002',
    'http://username:password@mobile-proxy1.com:8080',
    'http://username:password@mobile-proxy2.com:8081',
]

proxy_scraper = ProxyRotator(residential_proxies)
target_url = "https://www.canadagoose.com/us/en/home-page"

html_content = proxy_scraper.scrape_with_proxy_rotation(target_url)
if html_content:
    print("Successfully bypassed Kasada with proxy rotation!")
    # Process your HTML content here

Simple and effective. Just plug in your API key, set the options, and you’re good to go.

2. Rotate Real Request Headers for Kasada Bypass

Kasada doesn’t just check your User-Agent—it checks everything else around it. That means rotating headers isn’t just about switching strings randomly. You have to rotate them realistically.

import requests
import random
import time
from itertools import cycle

class KasadaHeaderRotator:
    def __init__(self):
        # Real browser headers collected from different browsers and OS
        self.chrome_headers = [
            {
                'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.36',
                'Accept': 'text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8',
                'Accept-Language': 'en-US,en;q=0.9',
                'Accept-Encoding': 'gzip, deflate, br',
                'Sec-CH-UA': '"Not_A Brand";v="8", "Chromium";v="120", "Google Chrome";v="120"',
                'Sec-CH-UA-Mobile': '?0',
                'Sec-CH-UA-Platform': '"Windows"',
                'Sec-Fetch-Dest': 'document',
                'Sec-Fetch-Mode': 'navigate',
                'Sec-Fetch-Site': 'none',
                'Upgrade-Insecure-Requests': '1',
                'Cache-Control': 'max-age=0'
            },
            {
                'User-Agent': 'Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.36',
                'Accept': 'text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8',
                'Accept-Language': 'en-US,en;q=0.9',
                'Accept-Encoding': 'gzip, deflate, br',
                'Sec-CH-UA': '"Not_A Brand";v="8", "Chromium";v="120", "Google Chrome";v="120"',
                'Sec-CH-UA-Mobile': '?0',
                'Sec-CH-UA-Platform': '"macOS"',
                'Sec-Fetch-Dest': 'document',
                'Sec-Fetch-Mode': 'navigate',
                'Sec-Fetch-Site': 'none',
                'Upgrade-Insecure-Requests': '1'
            }
        ]
        
        self.firefox_headers = [
            {
                'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:121.0) Gecko/20100101 Firefox/121.0',
                'Accept': 'text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,*/*;q=0.8',
                'Accept-Language': 'en-US,en;q=0.5',
                'Accept-Encoding': 'gzip, deflate, br',
                'Upgrade-Insecure-Requests': '1',
                'Sec-Fetch-Dest': 'document',
                'Sec-Fetch-Mode': 'navigate',
                'Sec-Fetch-Site': 'none'
            }
        ]
        
        self.session = requests.Session()
        
    def get_random_headers(self):
        """Get random realistic headers"""
        all_headers = self.chrome_headers + self.firefox_headers
        base_headers = random.choice(all_headers).copy()
        
        # Add some randomization to make it more realistic
        if random.random() < 0.3:  # 30% chance to add referer
            base_headers['Referer'] = 'https://www.google.com/'
            
        return base_headers
    
    def scrape_with_rotation(self, url, max_retries=3):
        """Scrape with header rotation and retry logic"""
        for attempt in range(max_retries):
            headers = self.get_random_headers()
            
            try:
                # Add random de

Here’s what that means:

  • Match headers with the browser you’re emulating
  • Stay current with the latest versions
  • Use consistent Accept-Language, Referer, and other browser-specific values

If you’re using Chrome, your headers should match what Chrome sends—down to the order and spacing. That level of detail matters.

Managing all this by hand can be tedious, especially at scale. Roundproxies can automate this entire process, ensuring every request looks like it’s coming from a real human and with proxies that work.

3. Bypass Kasada With Fortified Headless Browsers

Browser automation tools like Puppeteer, Playwright, and Selenium are solid for simulating real user behavior. But out of the box, they’re too easy to detect. Kasada knows how to spot common flags like:

  • HeadlessChrome in the User-Agent
  • Presence of window.webdriver

To avoid these, you need to run stealth versions of these tools:

const puppeteer = require('puppeteer');
const StealthPlugin = require('puppeteer-extra-plugin-stealth');
const puppeteerExtra = require('puppeteer-extra');

// Add stealth plugin
puppeteerExtra.use(StealthPlugin());

class KasadaPuppeteerScraper {
    constructor() {
        this.browser = null;
    }
    
    async initialize() {
        this.browser = await puppeteerExtra.launch({
            headless: false, // Set to true for production
            args: [
                '--no-sandbox',
                '--disable-setuid-sandbox',
                '--disable-dev-shm-usage',
                '--disable-accelerated-2d-canvas',
                '--no-first-run',
                '--no-zygote',
                '--disable-gpu',
                '--window-size=1920,1080'
            ]
        });
    }
    
    async scrapeKasadaSite(url) {
        if (!this.browser) {
            await this.initialize();
        }
        
        const page = await this.browser.newPage();
        
        try {
            // Set realistic viewport
            await page.setViewport({ width: 1920, height: 1080 });
            
            // Override webdriver detection
            await page.evaluateOnNewDocument(() => {
                Object.defineProperty(navigator, 'webdriver', {
                    get: () => undefined,
                });
                
                // Remove automated testing signatures
                delete window.chrome.runtime.onConnect;
            });
            
            // Navigate with realistic behavior
            await page.goto(url, { 
                waitUntil: 'networkidle2',
                timeout: 60000 
            });
            
            // Mimic human behavior
            await this.simulateHumanBehavior(page);
            
            // Wait for Kasada challenges to complete
            await page.waitForTimeout(3000);
            
            const content = await page.content();
            return content;
            
        } catch (error) {
            console.error('Scraping error:', error);
            return null;
        } finally {
            await page.close();
        }
    }
    
    async simulateHumanBehavior(page) {
        // Random mouse movements
        await page.mouse.move(
            Math.random() * 1920,
            Math.random() * 1080
        );
        
        // Random scroll
        await page.evaluate(() => {
            window.scrollBy(0, Math.random() * 500);
        });
        
        // Random wait
        await page.waitForTimeout(Math.random() * 2000 + 1000);
    }
    
    async close() {
        if (this.browser) {
            await this.browser.close();
        }
    }
}

// Usage
async function main() {
    const scraper = new KasadaPuppeteerScraper();
    
    try {
        const content = await scraper.scrapeKasadaSite('https://kasada-protected-site.com');
        if (content) {
            console.log('Successfully scraped Kasada-protected site!');
            // Process content here
        }
    } finally {
        await scraper.close();
    }
}

main();
  • Puppeteer Stealth Plugin
  • Playwright Stealth
  • Undetected ChromeDriver (UC) for Selenium

These fortified versions are tweaked to hide the usual signs of automation. They help, but they’re still not perfect—especially at scale. Running dozens of headless browser instances burns through CPU and memory, fast.

Wrapping Up

There’s no denying it: Kasada is tough. Its mix of fingerprinting, behavior analysis, and IP reputation makes it one of the hardest anti-bot systems to bypass.

Manual methods like header rotation or fortified browsers can work—but they come with a high maintenance cost and scalability challenges.

Marius Bernard
Article by

Marius Bernard

Marius Bernard is a Product Advisor, Technical SEO, & Brand Ambassador at Roundproxies. He was the lead author for the SEO chapter of the 2024 Web and a reviewer for the 2023 SEO chapter.