How to parse a page online?

Question

Java

There is a source site (dynamic, everything is loaded on js - you can’t parse with curl).
I enter a search query on my site. I need to somehow pass the request to the source site, get a response and send it back to my site.
Probably clumsily explained, but I hope you get the gist.
What technologies can be used to organize this?
I will be glad to any advice!

Answer 1

phantomjs

Answer 2

JS, oddly enough, also makes requests. Watch where his tentacles grow and do the same.

Answer 3

www.telerik.com/fiddler