Dojo.request.post - Returned Promise Says "rejected", But Server Seems To Have Accepted The Request

I try to add a feature to an ArcGIS feature service through Arcgis JavaScript API and dojo/request. I've already been pointed to how to include the request module and I get some re

Solution 1:

Solved! I solved the problems that I was asking for in the edits. The problem that remained was with the uri generation - I made it dynamically through Orchard's ViewBag, and I didn't notice it's wrong until I changed the address to another service. Now I use a static URI and everything works right.