HTTP cookie

This can lead to unreliability, confusion, and bugs.

Use of Cookies - Scientific American

Thus, anyone who uses multiple accounts, computers, or browsers has multiple sets of cookies. In the former case, the cookie will only be sent for requests to foo.

Ordinary cookies, by contrast, have an origin of a specific domain name, such as example. September Learn how and when to remove this template message. Confirm by clicking Clear all.

What Are Cookies on a Computer?

The HTTP protocol includes the basic access authentication and the digest access authentication protocols, which allow access to a web page only when the user has provided the correct username and password. Third-party cookies are created by other sites.

On your computer, open Chrome. January 6, Cookies were originally introduced to provide a way for users to record items they want to purchase as they navigate throughout a website a virtual "shopping cart" or "shopping basket". Thus, its content will never change. The Wall Street Journal found that America's top fifty websites installed an average of sixty-four pieces of tracking technology onto computers, resulting in a total of 3, tracking files.

Electronic Frontier Foundation. This means that, for the cookie's entire lifespan which can be as long or as short as its creators want , its information will be transmitted to the server every time the user visits the website that it belongs to, or every time the user views a resource belonging to that website from another website such as an advertisement. This opens up the potential for tracking the user's browsing history and is often used by advertisers in an effort to serve relevant advertisements to each user.

This makes the cookie less likely to be exposed to cookie theft via eavesdropping. Allow or block cookies by default On your computer, open Chrome.

Clear, enable, and manage cookies in Chrome

In particular, cookies were accepted by default, and users were not notified of their presence. With cookies, sites can keep you signed in, remember your site preferences, and give you locally relevant content.

Cookies are files created by websites you visit. At the top right, click More. By analyzing this log file, it is then possible to find out which pages the user has visited, in what sequence, and for how long. The server knows the IP address of the computer running the browser or the proxy , if any is used and could theoretically link a user's session to this IP address.

Learn how to manage cookies in Opera, for a smooth and safe browsing experience. Please help improve it or discuss these issues on the talk page. This data can be used instead of session cookies and is also cross-domain.