Should calculation requests be a GET or POST?

Question

I'm building some services with ASP.NET Web API to perform calculations. Should the requests be GETs or POSTs?

The calculations will have 0..n parameters, but most likely 3-6. I plan to put the parameters in the body as json. This leads me to think I should be using POSTs.

Thoughts? Thanks!

Answer 1

Given that the calculations are idempotent, you should use GET. Browsers may cache these requests by default (which I assume for your application is a good thing). Also, there will be no annoying "postback data to server" or whatever popups.