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An HTTP request header is a component of a network packet sent by a browser or client to the server to request for a specific page or data on the Web server. It is used in Web communications or Internet browsing to transport user requests to the corresponding website’s Web server.
An HTTP request header primarily enables a user in accessing a website. Each time a user website or webpage in a browser, an HTTP request header is generated by the browser and is sent to the website / Web server. Typically, the information within the HTTP request header is in form of plain text record of data/page request made by the user. Some of the information within an HTTP request header includes:
In response, the Web server/host sends back an HTTP response header containing the requested data.