How to use RequiresClaims in 2.0?

[dlwiii]

I do not see any documentation about how to use RequiresClaims for 2.0 This and other missing documentation makes upgradig extremenly difficult.

[dlwiii]

Ok, after hours trying to move 1.4 to 2.0, I once again rolled everything back. Too much undocumented, too many issues. I really would like to do this, but it's not worth my time right now.
If I could just move to the Get("/", x=> { ...}); syntax, that would be a good start. But all the other stuff gets in the way, and are only revealed as I replace the hundreds of Get[] statements. No fun.