Is it possible to access a servlet API using R?

Hello all,
Can anyone kindly offer guidance on using R to connect to API's using URL Servlet requests.
I am trying to access the OASIS programs which ISO's maintain. All the ISO's use URL Servlet requests.
Is there any documentation on accessing such an API using R ?

   There is unfortunately no reproducible code I can share as I have not written any yet. Any guidance/help is greatly appreciated.