collect data from the web

Hello everyone! Good Morning...
I would like some tips on how to get data from a web page [1] within R.
I made a few attempts, but I was unsuccessful because I have little
knowledge of the http / https protocol.
If anyone can provide any guidance, I would appreciate it very much.

My difficulty is because this page appears to be a front end that 
outsources to several javascripts to the server that actually deliver 
the data.

Thank you in advance!

Cleber Borges

[1] - https://bbtc.cma.com.br/topchart/?&pagetitle=IBOVESPA