Blocked Requests

Even with residential ISP proxies, some requests may be blocked by target websites. This guide covers why blocks happen and how to handle them.

Why requests get blocked

Target websites use various detection methods:

Detection Method	What It Checks
Rate limiting	Too many requests from one IP in a short period
Header fingerprinting	Missing or suspicious HTTP headers
TLS fingerprinting	Browser-like vs bot-like TLS handshake
Behavioral analysis	Non-human navigation patterns
Captcha challenges	Interactive verification to prove you’re human

How to avoid blocks

1. Add realistic headers

Always include common 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,*/*;q=0.8",
    "Accept-Language": "en-US,en;q=0.9",
    "Accept-Encoding": "gzip, deflate, br",
}

response = requests.get(url, proxies=proxies, headers=headers)

2. Rotate your proxy IPs

Distribute requests across your proxy pool:

import random

proxy_list = [
    "http://user:pass@ip1:3128",
    "http://user:pass@ip2:3128",
    "http://user:pass@ip3:3128",
]

proxy = random.choice(proxy_list)

3. Add delays between requests

Avoid machine-speed request patterns:

import time
import random

time.sleep(random.uniform(1, 3))  # 1-3 second random delay

4. Use a headless browser

For JavaScript-heavy sites with advanced detection, use Puppeteer or Playwright instead of raw HTTP requests:

const browser = await puppeteer.launch({
  args: ['--proxy-server=http://192.168.1.1:3128']
});

See our Puppeteer guide for full setup.

5. Handle retries gracefully

import time

def fetch_with_retry(url, proxies, max_retries=3):
    for attempt in range(max_retries):
        try:
            response = requests.get(url, proxies=proxies, timeout=15)
            if response.status_code == 200:
                return response
            if response.status_code == 429:  # Rate limited
                time.sleep(5 * (attempt + 1))
                continue
        except requests.exceptions.RequestException:
            time.sleep(2)
    return None

Status codes to watch for

Code	Meaning	Action
403	Forbidden	Rotate IP, add headers, add delays
429	Too Many Requests	Back off, reduce request rate
503	Service Unavailable	Target may be under load, retry later
407	Proxy Auth Required	Check your credentials

Stat Proxies uses residential ISP IPs, which have a significantly lower block rate than datacenter IPs. If you’re still getting blocked frequently, the issue is usually request patterns, not the proxy itself.

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Billing & Account

Why requests get blocked

How to avoid blocks

1. Add realistic headers

2. Rotate your proxy IPs

3. Add delays between requests

4. Use a headless browser

5. Handle retries gracefully

Status codes to watch for

Connection Errors

Slow Performance

​Why requests get blocked

​How to avoid blocks

​1. Add realistic headers

​2. Rotate your proxy IPs

​3. Add delays between requests

​4. Use a headless browser

​5. Handle retries gracefully

​Status codes to watch for

​Related

Connection Errors

Slow Performance

Why requests get blocked

How to avoid blocks

1. Add realistic headers

2. Rotate your proxy IPs

3. Add delays between requests

4. Use a headless browser

5. Handle retries gracefully

Status codes to watch for

Related