2 main updates in version 1.6.3:
Update 1: Add GET/POST selector to URL Data Source
For making POST HTTP requests, we use a WordPress' native function wp_remote_post.
Update 2: Update React.js library to version 0.14.7
With using POST requests with the URL Data Source, endless WordPress / Discourse integration possibilities arise when combined with the Discourse's Data Explorer plugin.
See a tutorial which goes through all steps in one interesting use-case: