To start with Lookyloo there are some concepts a user should be familiar with.


A cookie is a small amount of data generated by a website that the backend can store in the user’s browsers. Cookies are used for user tracking, personalization, and authentication. To learn more, read about Using HTTP cookies.

You can initiate a capture with existing cookies, see cookies documentation.


The HTTP Referer header is a type of request header that identifies the address of a previous web page that links to a current web page or requested resource. It allows websites and web servers to identify where the traffic is coming from. The usage of the referer header increases the risk of privacy and security issues on a website. To learn more, read about the Referer header.

You can initiate a capture with a referer.


An Inline Frame (iframe) is a component of an HTML element that allows documents, videos, and other media to be embedded within a page. The <iframe> tag defines a region within a document, in which the browser can display a separate document. The <iframe> tag specifies an inline frame, which is used to embed another document within an HTML document. To learn more, read about HTML iframes.


HTTP allows servers to redirect a request to a different location. A server specifies redirection by returning a 3xx status code. A redirect places instructions on the server to provide something different then the original request. To learn more, read about redirections in HTTP.


The User-Agent is a request header that allows network protocol peers to identify information about the web server. User agents are unique to every visitor on the web. The User-Agent string reveals a catalog of technical data and contains the user application or software, the operating system, versions, the web client, the web client’s version, and the engine responsible for the content display. To learn more, read about the User-Agent request header.

HTTP Response Status Code

When a request is made to a web server, a three digit HTTP response status code is returned. HTTP response status codes indicate whether a specific HTTP request has been successfully completed. To learn more, read about HTTP response status codes.

CNAME record

Type of DNS record that create an alias from one domain name to an other one. It is also often used in a technique called CNAME Cloaking to bypass the blocking of 3rd party cookies.