How to get base URL in Web API controller?

Url.Content("~/")

worked for me!

You could use VirtualPathRoot property from HttpRequestContext (request.GetRequestContext().VirtualPathRoot)

In the action method of the request to the url "http://localhost:85458/api/ctrl/"

var baseUrl = Request.RequestUri.GetLeftPart(UriPartial.Authority) ;

this will get you http://localhost:85458