Q:

send data through URI datastore

I'm using restful to send my data with HTTP GET POST etc. I want to use the data store on Google App Engine. Can someone explain where is URI located for the data store on  Google App Engine so I can send data to it?

A:

Assuming you're developing in Java you should take a look at the most popular library which is Objectify

Objectify is a Java data access API specifically designed for the
  Google App Engine datastore. It occupies a "middle ground"; easier to
  use and more transparent than JDO or JPA, but significantly more
  convenient than the Low-Level API. Objectify is designed to make
  novices immediately productive yet also expose the full power of the
  GAE datastore. Objectify lets you persist, retrieve, delete, and query
  your own typed objects.

Sample entity:
@Entity
class Car {
    @Id String vin; // Can be Long, long, or String
    String color;
}

How to create and save entity to datastore:
ofy().save().entity(new Car("123123", "red")).now();

