Postman

Postman is a powerful HTTP client for testing web services. 
Created by Abhinav Asthana, a programmer and designer based in Bangalore, India, 
Postman makes it easy to test, develop and document APIs by allowing users to quickly put together both simple and complex HTTP requests.

Postman is a Google Chrome app for interacting with HTTP APIs. 
It presents you with a friendly GUI for constructing requests and reading responses. 
The people behind Postman also offer an add-on package called Jetpacks, which includes some automation tools and, most crucially, a Javascript testing library.

 Postman is a popular API client that makes it easy for developers to create, share, test and document APIs. 
This is done by allowing users to create and save simple and complex HTTP/s requests, as well as read their responses. 
The result - more efficient and less tedious work.

Get the postman client - https://www.getpostman.com/

Step 1: Add the APPC collections to the postman
Click on Import

Import APPC-API.postman_collection.json

This will add all the API URI, Headers, Request, Pre-required Script into the Postman client.

Step 2: Add the environment
Click the settings icon in top right to select the environment. Import Windriver-lab-Environment.postman_environment.json & choose the environment from drop down.

Step 3:  Test
Select any API and click Send.

Hoorayyy !!!!. Now its easy to test the same api against different environments just by selecting in the environments drop down.