* Add more detail to Developer Exception Page with web API
* Add missing HEADERS section to plain-text output
* minor edit
* update port number
* accept --> request
* minor edit
* Add screen capture of testing in Postman
* Fix gif include
* Add missing word
* Display screen capture only for 3.0+
* Add missing 2.x details to web API error handling doc
* Delete unnecessary folder
* more work
* more work
* more work
* more work
* more work
* minor edits