Can you give an example of a header you have repeatedly encountered in practice?

In QA practice, HTTP request headers such as:

• Authorization — for transmitting tokens or access keys.
• Content-Type — indicates the format of the transmitted data, e.g., application/json.
• Accept — specifies the expected response format.
• User-Agent — information about the client application.

Example header:

Authorization: Bearer eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9...
Content-Type: application/json
Accept: application/json

These headers are often used in API testing and request automation.