How to get descriptive HTTP headers sent to the server?

Question

PHP

I need to get the http headers sent to the server to mimic the behavior of a browser.
I read the article www.php.su/lessons/?lesson_11 where it says that this can be done using the liveHttpHeaders extension. I did all this, but the fact is that all the articles say that such and such headers are sent, and they contain about 20 lines.
But in reality, it turns out that 200 such requests are sent when the page is opened, plus requests to other servers go in parallel.
How to know which request to simulate, because they are slightly different?

Answer 1

as a firebug variant