Here's my External Tool Config
Tool Name: KhanAcad
Tool Base URL: https://lti-examples.heroku.com/tools/khan_academy/config.xml
Consumer Key: sossiglti (one of your own invention)
Shared Secret: sossiglti (one of your own invention)
Secure Launch URL:
That will open a frame where one is browsing categories and videos available. Teacher does this … not the student.
Once one drills down to a video and one selects it, you will get a notice that from this time forward, anyone selecting the link you started to build will get the video … and then it shows the URL to that video you selected.
Once you return to your course, click the link just built and you'll see the video you had selected.
At first, one might have to use the .xml link above to find the tool_redirect?url ... hard to guess those. When the error page shows you copy the redirect link, go back to editing your tool and use the re-direct link in the Launch/Secure Launch URL.
Yeah, I know that's not very intuitive and it's strange, but ....
'spirit of sharing', Ken