As in [this other thread][1] I would use "in the internet" in the context of Application Programming Interfaces, or APIs. While an Average Joe user reads content off the "front" of an internet website (its Graphical User Interface, or GUI), a function call to an API actually sends a programming thread into the content of the website to retrieve the answer. That retrieval lends a sense of depth, of looking something up _in_ a website, that reading content that's already displayed _on the front_ just doesn't.

  [1]: http://english.stackexchange.com/a/82870/24443