There is a great Think Data Thursday from last year with examples of creating a Web Data Connector from start to end located here: Think Data Thursday - What is a Web Data Connector? - YouTube
the presenter, Tamas Foldi, is sometimes on here and assisting with questions as well.
I hope that helps
I am facing the same basic authentication problem.
Are you able to fix it with some workaround? Please suggest.
I have already posted my concern on a separate thread : .https://community.tableau.com/message/590051?et=watches.email.thread#590051