[Fixes #1378] Added few WebAPI like Action Results - Part 1

@rynowak 
Since I get to pick then let's make this a string. 

Now that my brain is working, I remember that we ran into issues with using `Uri` as this basis for this type in WebAPI 5.2.2 that we added workarounds for. Mainly that `new Uri(string)` doesn't always do what you want.  

So I think that using string here is objectively better. Let's keep the 'Uri' method on controller though