Send a POST request to create an object which it exists already in canvas

[RezaMazroei]

This is a general question about APIs. Imagine, we have an object (users, assignments, etc) in canvas with all parameters set especially (SIS ID, or integration ID). Now, I want to know, if I send an API(POST request) with exact parameters to canvas, what would happen when the object exists already in canvas?

The canvas ignore the POST request? or overwrite the object with the new request, or create a duplicate?

I am asking this question because I am developing a python code, reads the data from the database and sends POST requests to create an object in canvas, so I am worried if I send a request which the object is already into the system.