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Sessions allow you to maintain state, cookies, and connection pooling across multiple requests. Scrapling provides three session types corresponding to each fetcher: FetcherSession, StealthySession, and DynamicSession.

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Session Types Overview

SessionFetcherUse CaseMaintains
FetcherSessionFetcherHTTP requestsCookies, connections
StealthySessionStealthyFetcherAnti-bot bypassBrowser context, cookies
DynamicSessionDynamicFetcherBrowser automationBrowser context, cookies

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FetcherSession (HTTP)

Fast HTTP sessions with browser impersonation.

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Basic Usage

from scrapling.fetchers import FetcherSession

with FetcherSession(impersonate='chrome') as session:
    # First request
    page1 = session.get('https://quotes.toscrape.com/')
    
    # Second request (cookies and connections maintained)
    page2 = session.get('https://quotes.toscrape.com/page/2/')
    
    # POST request
    response = session.post(
        'https://httpbin.org/post',
        data={'key': 'value'}
    )

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Configuration Options

from scrapling.fetchers import FetcherSession

with FetcherSession(
    # Browser impersonation
    impersonate='chrome',              # Browser to impersonate
    stealthy_headers=True,             # Generate realistic headers
    
    # Default settings
    headers={'Authorization': 'Bearer token'},
    timeout=60,                        # Default timeout in seconds
    retries=3,                         # Number of retries
    retry_delay=2,                     # Delay between retries (seconds)
    
    # SSL/TLS
    verify=True,                       # Verify SSL certificates
    cert=None,                         # Client certificate
    
    # Redirects
    follow_redirects=True,             # Follow redirects
    max_redirects=30,                  # Max redirect count
    
    # HTTP version
    http3=False,                       # Use HTTP/3
    
    # Proxy
    proxy='http://proxy:8080',         # Default proxy
    proxy_auth=('user', 'pass'),       # Proxy authentication
) as session:
    page = session.get('https://example.com')

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Async Context Support

FetcherSession is context-aware and works in both sync and async: 
import asyncio
from scrapling.fetchers import FetcherSession

async def scrape():
    async with FetcherSession(http3=True) as session:
        # All methods are awaitable in async context
        page1 = await session.get('https://quotes.toscrape.com/')
        page2 = await session.get('https://quotes.toscrape.com/page/2/')
        
        # POST request
        response = await session.post(
            'https://httpbin.org/post',
            json={'data': 'value'}
        )

asyncio.run(scrape())

​
Per-Request Overrides

with FetcherSession(impersonate='chrome', timeout=30) as session:
    # Use session defaults
    page1 = session.get('https://example.com')
    
    # Override specific settings
    page2 = session.get(
        'https://slow-site.com',
        timeout=120,                   # Override timeout
        impersonate='firefox135',      # Different browser
        headers={'Custom': 'header'},  # Additional headers
    )

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StealthySession (Anti-Bot)

Persistent browser session with anti-bot capabilities.

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Basic Usage

from scrapling.fetchers import StealthySession

with StealthySession(
    headless=True,
    solve_cloudflare=True
) as session:
    # First request (solves Cloudflare, saves cookies)
    page1 = session.fetch('https://protected-site.com/')
    
    # Second request (cookies maintained)
    page2 = session.fetch('https://protected-site.com/data')
    
    # Third request
    page3 = session.fetch('https://protected-site.com/more-data')

​
Configuration Options

from scrapling.fetchers import StealthySession

with StealthySession(
    # Browser mode
    headless=True,
    real_chrome=False,
    
    # Anti-detection
    solve_cloudflare=True,
    hide_canvas=True,
    block_webrtc=True,
    allow_webgl=True,
    
    # Default timing
    timeout=30000,                     # milliseconds
    network_idle=False,
    load_dom=True,
    
    # Headers
    google_search=True,
    extra_headers={'Custom': 'value'},
    useragent='Mozilla/5.0...',
    
    # Resources
    disable_resources=False,
    blocked_domains={'ads.com'},
    
    # Persistence
    user_data_dir='./browser_profile',
    cookies=[{'name': 'session', 'value': 'xyz', 'domain': 'example.com'}],
    
    # Locale
    locale='en-US',
    timezone_id='America/New_York',
    
    # Advanced
    proxy='http://proxy:8080',
    init_script='./init.js',
) as session:
    page = session.fetch('https://example.com')

​
Persistent Browser Profile

Maintain browser state across script runs: 
with StealthySession(
    headless=True,
    user_data_dir='./my_browser_profile',  # Persistent directory
    solve_cloudflare=True
) as session:
    # First run: solve Cloudflare, save to profile
    page = session.fetch('https://protected-site.com')
    
# Next run: cookies and state loaded from profile
with StealthySession(
    headless=True,
    user_data_dir='./my_browser_profile'
) as session:
    # No Cloudflare challenge - cookies still valid
    page = session.fetch('https://protected-site.com/data')

​
Async Stealth Session

import asyncio
from scrapling.fetchers import AsyncStealthySession

async def scrape():
    async with AsyncStealthySession(
        headless=True,
        max_pages=3  # Pool of 3 browser tabs
    ) as session:
        # Concurrent requests
        tasks = [
            session.fetch('https://example.com/page1'),
            session.fetch('https://example.com/page2'),
            session.fetch('https://example.com/page3'),
        ]
        results = await asyncio.gather(*tasks)
        
        # Check pool stats
        stats = session.get_pool_stats()
        print(f"Busy: {stats['busy']}, Free: {stats['free']}")

asyncio.run(scrape())

​
DynamicSession (Browser Automation)

Persistent browser session for automation.

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Basic Usage

from scrapling.fetchers import DynamicSession

with DynamicSession(
    headless=True,
    disable_resources=True,
    network_idle=True
) as session:
    # Login
    page1 = session.fetch('https://example.com/login', load_dom=False)
    
    # Access protected page
    page2 = session.fetch('https://example.com/dashboard')
    
    # Another page (cookies maintained)
    page3 = session.fetch('https://example.com/data')

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Configuration Options

from scrapling.fetchers import DynamicSession

with DynamicSession(
    # Browser mode
    headless=True,
    real_chrome=False,
    
    # Timing
    timeout=30000,
    network_idle=False,
    load_dom=True,
    
    # Headers
    google_search=True,
    extra_headers={'Authorization': 'Bearer token'},
    useragent='Mozilla/5.0...',
    
    # Resources
    disable_resources=False,
    blocked_domains={'analytics.com'},
    
    # State
    cookies=[{'name': 'token', 'value': 'xyz', 'domain': 'example.com'}],
    init_script='./init.js',
    
    # Locale
    locale='en-GB',
    
    # Advanced
    proxy='http://proxy:8080',
    cdp_url='http://localhost:9222',
) as session:
    page = session.fetch('https://example.com')

​
Async Dynamic Session

import asyncio
from scrapling.fetchers import AsyncDynamicSession

async def scrape():
    async with AsyncDynamicSession(
        headless=True,
        max_pages=5,  # Pool of 5 browser tabs
        disable_resources=True
    ) as session:
        urls = [f'https://example.com/page{i}' for i in range(10)]
        
        # Concurrent requests with tab reuse
        tasks = [session.fetch(url) for url in urls]
        results = await asyncio.gather(*tasks)
        
        # Pool automatically manages tab reuse
        print(session.get_pool_stats())

asyncio.run(scrape())

​
Session Lifecycle

Always use context managers to ensure proper cleanup: 
with StealthySession(headless=True) as session:
    page = session.fetch('https://example.com')
# Browser automatically closed

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Manual Lifecycle

For advanced use cases: 
from scrapling.fetchers import StealthySession

session = StealthySession(headless=True)
try:
    session.start()  # Open browser
    page1 = session.fetch('https://example.com/page1')
    page2 = session.fetch('https://example.com/page2')
finally:
    session.stop()   # Close browser

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Page Pooling (Browser Sessions)

Browser sessions (Stealthy and Dynamic) support page pooling for concurrent requests:

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Pool Configuration

import asyncio
from scrapling.fetchers import AsyncStealthySession

async def scrape():
    async with AsyncStealthySession(
        headless=True,
        max_pages=10  # Pool size: 10 concurrent tabs
    ) as session:
        # Make 50 concurrent requests
        # Only 10 tabs are used, reused as requests complete
        tasks = [session.fetch(f'https://example.com/page{i}') for i in range(50)]
        results = await asyncio.gather(*tasks)

asyncio.run(scrape())

​
Pool Stats

Monitor pool usage: 
async with AsyncStealthySession(max_pages=3) as session:
    stats = session.get_pool_stats()
    print(stats)  # {'busy': 0, 'free': 3, 'error': 0}
    
    # Start some requests
    task1 = session.fetch('https://example.com/page1')
    task2 = session.fetch('https://example.com/page2')
    
    stats = session.get_pool_stats()
    print(stats)  # {'busy': 2, 'free': 1, 'error': 0}

​
Per-Request Customization

Override session settings per request: 
with StealthySession(headless=True, timeout=30000) as session:
    # Use session defaults
    page1 = session.fetch('https://example.com')
    
    # Override settings
    page2 = session.fetch(
        'https://slow-site.com',
        timeout=60000,                 # Longer timeout
        network_idle=True,             # Wait for network idle
        wait_selector='.content',      # Wait for selector
    )
    
    # Different proxy
    page3 = session.fetch(
        'https://geo-restricted.com',
        proxy='http://us-proxy:8080'
    )

​
Setting Cookies

cookies = [
    {
        'name': 'session_id',
        'value': 'abc123',
        'domain': 'example.com',
        'path': '/',
    }
]

with StealthySession(headless=True, cookies=cookies) as session:
    page = session.fetch('https://example.com')

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Accessing Cookies

Browser sessions provide access to cookies through the page object: 
with StealthySession(headless=True) as session:
    page = session.fetch('https://example.com')
    # Cookies are automatically maintained for subsequent requests

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Best Practices

Use with statements to ensure proper cleanup of sessions, especially for browser sessions.
Sessions maintain state and connections. Reuse them instead of creating new ones for each request.
Set sensible defaults at the session level and override only when needed per-request.
For browser sessions, use user_data_dir to maintain state across script runs.
Set max_pages based on your concurrency needs and system resources. More tabs = more memory.
Use get_pool_stats() to debug concurrency issues and optimize pool size.

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Session Comparison

FeatureFetcherSessionStealthySessionDynamicSession
Speed⚡⚡⚡⚡⚡⚡
Connection Pooling✅❌❌
Browser Context❌✅✅
JavaScript❌✅✅
Cloudflare Bypass❌✅❌
Page Pool❌✅✅
Resource UsageLowMediumHigh
Persistent Profile❌✅✅

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Next Steps

Proxy Rotation

Automatically rotate proxies in sessions

Spiders

Use sessions in spider crawls

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