GET vs. POST ajax requests: When and how to use either?

Question

What are the strengths of GET over POST and vice versa when creating an ajax request? How do I know which I should use at any given time? Is it a security-minded decision?

Answer 1

You should use GET and POST requests in AJAX calls just as you would use GET and POST requests in normal calls. Basic rule of thumb:

Will the request modify anything in your Model?

• YES: The request will modify (add/update/delete) data from your data store, or in some other way change the state of the server (cause creation of a file, for example). Use POST.
• NO: The request will not affect the state of anything (database, file system, sessions, ...) on the server, but merely retrieve information. Use GET.