How to get the current WDA's URL?

Hello,

I have developed a custom WDA, well, for some reason i need to get the current WDA's complete, pls. let me know do we have any class / method or FM? 

I am awarre of that building URL based on the current environment /port by using classes, but, just checking do we hv any easy / ready-made class for reading the current WDA's URL

Thank you