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What Are Cookies?

Cookies are small name-value pieces of data that a website asks your browser to store and send back with later requests. They keep you logged in, remember settings and carts, and let sites recognise a returning visitor.

  • Session Control
  • High Speed
  • Privacy First
Best fit for CookiesRotating Residential Proxiesfrom$0.63/GB
how it works

How cookies work

A server sets a cookie with a Set-Cookie response header, and the browser returns it in the Cookie header on every matching request until it expires. The rules are in RFC 6265. A login usually sets a session ID: a long random token that points to your session on the server, so whoever holds the cookie is treated as you.

First-party cookies belong to the site you visit; third-party cookies belong to other domains embedded in the page, mostly for ads and tracking. Safari and Firefox block third-party tracking cookies by default.

  • AttributeExpires / Max-AgeWhen the cookie is deleted; without them it lasts until the browser closes
  • AttributeDomain / PathWhich hosts and paths receive it
  • AttributeSecureSent over HTTPS only
  • AttributeHttpOnlyHidden from JavaScript, which protects session cookies
  • AttributeSameSiteWhether it is sent on requests from other sites (Lax, Strict, None)
why it matters

Why cookies matter for proxy users

Sites tie cookies to more than the browser. A session that was created on one IP and suddenly continues from another country looks like a stolen cookie, and many sites log it out or ask for verification. Keep each cookie jar and its IP together.

CleanProxies rotating residential proxies hold a sticky IP for 5, 10, 15, 30 or 60 minutes or 24 hours, long enough for a logged-in flow to keep its cookies and IP together.

Cookies: what it means for you
  • One identity, one IP: give each account or browser profile its own static IP or sticky session.
  • Use a session object in code so cookies persist between requests, and a separate one per proxy session.
  • Clear cookies when you rotate to a fresh identity for public data, so requests don't carry history from another IP.
  • Anti-bot clearance cookies are often bound to the IP that earned them; rotating mid-flow can bring a challenge back.
One cookie jar per proxy session in PythonPython
import requests

session = requests.Session()
session.proxies = {"https": "http://USERNAME:PASSWORD@HOST:PORT"}

session.get("https://example.com/")          # server sets cookies
print(session.cookies.get_dict())             # kept for later requests
session.get("https://example.com/account")   # cookies sent automatically

Rotating residential proxies from $0.63/GB

The CleanProxies proxy that fits best here, with a $4.99 trial to test it first.

Guides from the blog

Setup guides and best practices from the CleanProxies blog.

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Related terms

Terms that come up alongside Cookies.

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Cookies FAQs

Straight answers about Cookies.

Small pieces of data a site stores in your browser so it can remember you between requests and visits: logins, settings, carts and analytics IDs.

Got more questions?All FAQs