As you could tell from browsing other similar threads, this forum isn't the right place to look for specific issue technical support. You should post this issue to either
stackoverflow or the
public issue tracker for App Engine, and there you'll be in the right place for people to help. This forum is meant for more general discussion among the developer community of the platform and services. When you make your post to stackoverlow or the public issue tracker, I suggest you include information like the following, to allow people to better understand what's happening:
* your JS code which triggers the request
* a sample request
* a sample response
* your thoughts on why this might be happening
* what you've done or checked to attempt to understand/fix it
Merely stating that an issue is occurring using the most immediately-available information isn't usually a good way to ask for help, since it gives very little for others to work with, except in the case that this superficial information is enough to look up a solution, in which case you could have done it yourself just as well as the person who is trying to help.