This header is important because websites use this header to change their behavior based on where the user came from. Referer: The referrer header (please note the typo) contains the URL from which the actual URL has been requested. Your browser will receive that cookie and will pass it along with all subsequent requests. When you submit a login form, the server will verify your credentials and, if you provided a valid login, issue a session cookie, which clearly identifies the user session for your particular user account. However, they are a vital browser feature for mentioned authentication. Cookies are used for a number of different purposes, ranging from authentication information, to user preferences, to more nefarious things such as user-tracking with personalised, unique user identifiers. This could be either up to a certain date of expiration (standard cookies) or only temporarily until you close your browser (session cookies). Cookies are one way how websites can store data on your machine.
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