Sticky Sessions vs Rotating Sessions: Best Proxy Strategy for CAPTCHAs

Sticky sessions keep the same IP for a set duration. Rotating sessions assign a new IP per request. Choosing the wrong one inflates CAPTCHA rates and wastes API credits.

How Each Mode Works

STICKY SESSION:
  Request 1 ──▶ IP: 192.168.1.50 ──▶ site.com/login
  Request 2 ──▶ IP: 192.168.1.50 ──▶ site.com/dashboard
  Request 3 ──▶ IP: 192.168.1.50 ──▶ site.com/account
  (Same IP for all requests in the session window)

ROTATING SESSION:
  Request 1 ──▶ IP: 192.168.1.50 ──▶ site.com/page1
  Request 2 ──▶ IP: 10.0.0.77   ──▶ site.com/page2
  Request 3 ──▶ IP: 172.16.5.22 ──▶ site.com/page3
  (Different IP per request)

Head-to-Head Comparison

When Sticky Sessions Win

Multi-Step Workflows

CAPTCHAs validate tokens against the requesting IP. If your IP changes between solving and submitting, the token may be rejected.

import requests
import time

CAPTCHAAI_KEY = "YOUR_API_KEY"
CAPTCHAAI_URL = "https://ocr.captchaai.com"

# Sticky session: same IP for the entire login flow
STICKY_PROXY = {
    "http": "http://user-session-abc123:pass@proxy.example.com:5000",
    "https": "http://user-session-abc123:pass@proxy.example.com:5000",
}

session = requests.Session()
session.proxies = STICKY_PROXY
session.headers.update({
    "User-Agent": "Mozilla/5.0 (Windows NT 10.0; Win64; x64) "
    "AppleWebKit/537.36 Chrome/126.0.0.0 Safari/537.36",
})


def login_with_captcha(url, sitekey, username, password):
    """Full login flow — MUST use same IP throughout."""
    # Step 1: Load login page (IP: 192.168.1.50)
    session.get(url)

    # Step 2: Solve CAPTCHA (solved against IP: 192.168.1.50)
    token = solve_recaptcha(sitekey, url)

    # Step 3: Submit login (MUST be IP: 192.168.1.50)
    resp = session.post(url, data={
        "username": username,
        "password": password,
        "g-recaptcha-response": token,
    })

    return resp.status_code == 200


def solve_recaptcha(sitekey, pageurl):
    resp = requests.post(f"{CAPTCHAAI_URL}/in.php", data={
        "key": CAPTCHAAI_KEY,
        "method": "userrecaptcha",
        "googlekey": sitekey,
        "pageurl": pageurl,
        "json": 1,
    })
    task_id = resp.json()["request"]

    for _ in range(60):
        time.sleep(5)
        result = requests.get(f"{CAPTCHAAI_URL}/res.php", params={
            "key": CAPTCHAAI_KEY, "action": "get",
            "id": task_id, "json": 1,
        })
        data = result.json()
        if data["request"] != "CAPCHA_NOT_READY":
            return data["request"]

    raise TimeoutError("CAPTCHA solve timeout")

Why IP Consistency Matters

Sticky session:

  1. Browser loads page    → IP: 5.5.5.5
  2. CAPTCHA solved        → Token bound to session
  3. Form submitted        → IP: 5.5.5.5 ✅ Token accepted

Rotating session:

  1. Browser loads page    → IP: 5.5.5.5
  2. CAPTCHA solved        → Token bound to session
  3. Form submitted        → IP: 9.9.9.9 ❌ Token may be rejected

When Rotating Sessions Win

Bulk Page Scraping

Each page is independent. Rotating IPs spreads requests across a larger pool, reducing per-IP detection.

import concurrent.futures

ROTATING_PROXY = {
    "http": "http://user:pass@rotating.proxy.example.com:5000",
    "https": "http://user:pass@rotating.proxy.example.com:5000",
}


def scrape_page(url):
    """Each request gets a fresh IP automatically."""
    resp = requests.get(
        url,
        proxies=ROTATING_PROXY,
        headers={"User-Agent": "Mozilla/5.0 (Windows NT 10.0; Win64; x64)"},
        timeout=30,
    )
    if resp.status_code == 200:
        return url, resp.text
    return url, None


urls = [f"https://example.com/products?page={i}" for i in range(1, 501)]

with concurrent.futures.ThreadPoolExecutor(max_workers=10) as pool:
    results = list(pool.map(scrape_page, urls))
    success = sum(1 for _, html in results if html)
    print(f"Scraped: {success}/{len(urls)}")

Search Engine Scraping

Search engines track query volume per IP. Rotating avoids rate limits:

def scrape_search(query, pages=10):
    results = []
    for page in range(pages):
        # Each request → new IP
        resp = requests.get(
            "https://search-engine.example.com/search",
            params={"q": query, "start": page * 10},
            proxies=ROTATING_PROXY,
            timeout=20,
        )
        results.append(resp.text)
        time.sleep(2)
    return results

Hybrid Strategy

Use both modes in the same pipeline:

class HybridProxyManager:
    """Sticky for multi-step flows, rotating for single requests."""

    def __init__(self, provider_host, username, password, port=5000):
        self.host = provider_host
        self.username = username
        self.password = password
        self.port = port

    def get_rotating_proxy(self):
        return {
            "http": f"http://{self.username}:{self.password}@{self.host}:{self.port}",
            "https": f"http://{self.username}:{self.password}@{self.host}:{self.port}",
        }

    def get_sticky_proxy(self, session_id, duration_min=10):
        sticky_user = f"{self.username}-session-{session_id}-ttl-{duration_min}"
        return {
            "http": f"http://{sticky_user}:{self.password}@{self.host}:{self.port}",
            "https": f"http://{sticky_user}:{self.password}@{self.host}:{self.port}",
        }


proxy_mgr = HybridProxyManager("proxy.example.com", "user", "pass")


def scrape_with_auto_strategy(url, needs_login=False):
    if needs_login:
        # Multi-step → sticky
        import uuid
        session_id = uuid.uuid4().hex[:8]
        proxy = proxy_mgr.get_sticky_proxy(session_id)
    else:
        # Single page → rotating
        proxy = proxy_mgr.get_rotating_proxy()

    return requests.get(url, proxies=proxy, timeout=30)

Node.js Implementation

const axios = require("axios");

const CAPTCHAAI_KEY = "YOUR_API_KEY";
const PROXY_HOST = "proxy.example.com";
const PROXY_PORT = 5000;

function getProxy(mode, sessionId = null) {
  const user =
    mode === "sticky" ? `user-session-${sessionId}` : "user";

  return {
    proxy: {
      host: PROXY_HOST,
      port: PROXY_PORT,
      auth: { username: user, password: "pass" },
    },
  };
}

// Rotating: bulk scrape
async function scrapePages(urls) {
  const results = [];
  for (const url of urls) {
    const config = getProxy("rotating");
    const resp = await axios.get(url, { ...config, timeout: 30000 });
    results.push({ url, data: resp.data });
  }
  return results;
}

// Sticky: login flow
async function loginFlow(loginUrl, sitekey, credentials) {
  const sessionId = Date.now().toString(36);
  const config = getProxy("sticky", sessionId);

  // Step 1: Load page
  await axios.get(loginUrl, config);

  // Step 2: Solve CAPTCHA
  const submitResp = await axios.post(
    "https://ocr.captchaai.com/in.php",
    null,
    {
      params: {
        key: CAPTCHAAI_KEY,
        method: "userrecaptcha",
        googlekey: sitekey,
        pageurl: loginUrl,
        json: 1,
      },
    }
  );
  const taskId = submitResp.data.request;

  let token;
  for (let i = 0; i < 60; i++) {
    await new Promise((r) => setTimeout(r, 5000));
    const res = await axios.get("https://ocr.captchaai.com/res.php", {
      params: { key: CAPTCHAAI_KEY, action: "get", id: taskId, json: 1 },
    });
    if (res.data.request !== "CAPCHA_NOT_READY") {
      token = res.data.request;
      break;
    }
  }

  // Step 3: Submit with same IP
  return axios.post(
    loginUrl,
    {
      ...credentials,
      "g-recaptcha-response": token,
    },
    config
  );
}

Decision Matrix

Sticky Session Duration

Rule of thumb: Set sticky duration to 2x your expected flow time.

Troubleshooting

FAQ

Can I mix sticky and rotating in one project?

Yes. Use the hybrid approach — sticky for authentication flows, rotating for data collection. Most proxy providers support both modes on the same plan.

Does sticky session guarantee the same IP?

Most providers guarantee it within the TTL window. If the IP becomes unavailable (carrier reassignment, pool rotation), a new IP is assigned.

Which mode is cheaper?

Same price — you pay per GB or per request regardless of mode. The cost difference comes from CAPTCHA rates: wrong mode → more CAPTCHAs → higher CaptchaAI spend.

How do I set sticky sessions with my proxy provider?

Most use a session ID in the username: user-session-abc123. Check your provider's docs for the exact format. We cover Bright Data, Smartproxy, and Oxylabs in dedicated guides.

Related Guides

• Rotating Residential Proxies
• Proxy Quality Affects Solve Rate
• Browser Session Persistence

Match your proxy strategy to your workflow — get your CaptchaAI key to handle CAPTCHAs in any session mode.