node.js - posting to same URL but using 2 different functions -

Part of my application involves creating a test (i.e., selecting an X-number from the questions of filtered questions). The user is able to determine how big a test they want but to do this, I need to calculate on the server how many questions are available. The function that creates a test is sent through this post:

  app post ('/ user / created_tate', users.create_test);  

As the user changes the filter, I want to set the number of available questions ... all I can think is to use the AJAX post to send the filter information, but It will be passed to do the same thing as creating an exam ... Is there a way to post to the same URL, but to determine which function do you execute?

1. Consider creating another function - the best method for the perfect API
   1. Consider the name of app.post ('/ user / test') .
   2. The second function may be app.post ('/ user .
2. or request a single post and make sure Make sure that your function both creates and filters.

In general, the lack of app design maturity is reconsidering client-server communication.