https://www.mediawiki.org/wiki/Requests_for_comment/PHP_Virtual_REST_Service
With gerrit 181011 VisualEditor did this, Flow doing at T74988
https://www.mediawiki.org/wiki/Requests_for_comment/PHP_Virtual_REST_Service
With gerrit 181011 VisualEditor did this, Flow doing at T74988
Change 203002 had a related patch set uploaded (by Santhosh):
Use ParsoidVirtualRESTService for HTML to Wikitext transformation
Change 203002 merged by jenkins-bot:
Use ParsoidVirtualRESTService for HTML to Wikitext transformation