How does the Header header transmit data?

I see others say that header headers can pass token values. How do you pass them? Can you give me an example?

Php
Mar.09,2021

in the browser, you can use XMLHttpRequset to pass the token value in the header

   

header contains data in the format key-value

you can use ajax to set values on the page: xhr.setRequestHeader ('kicking,' v');

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