[OT?] What does Firefox do that lua-curl can't?

[Dirk Laurie <dirk.laurie@...>]

There is a package on Luarocks called lua-curl. With it, I can surf
the Internet form inside my Lua program.

Or so I thought. After all, all that Firefox and friends do is to send
a URL with everything you are communicating to a server and displaying
or otherwise utilizing the stuff it sends back.

I found that I could do general surfing thta way but did not succeed
in logging in to a site on which I am a registered user.

Maybe this is off-topic for this list. But maybe someone has used
lua-curl and knows what to do.