HTTP_AUTHORIZATION seems to be a server side environment variable, but what values can it be? Are there examples? Is it set by some HTTP headers?

Also, how does it look like on the browser side when it asks for username and password (is it an HTML form or is it a popup box that asks for username and password (which is modal and so if not clicking OK or Cancel, then the browser cannot be click on)).

Usually, a user login form will POST to the server with POST variables such as

username=peter&password=123

so what is this HTTP_AUTHORIZATION about?

http-headers webserver environment-variables
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