What is contained in HTTP request headers?

HTTP request headers contain additional information about the request itself and the client. They consist of "key: value" pairs and may include:

• Host — the name of the server the client is accessing.
• User-Agent — information about the browser or client application.
• Accept — the types of data the client is willing to accept.
• Content-Type — the type of content in the request body (e.g., application/json).
• Authorization — authentication data.
• Cookie — session data or user data.
• Referer — the URL of the page from which the request was made.

These headers help the server understand the context of the request and respond appropriately.