Virtually every web project you work on requires that you get the current page's complete URL. Years ago, I got tired of using non-type-safe ways of munging together various Request.ServerVariables to get it (anyone remember stuff like "If Request.ServerVariables("HTTPS") = "on" Then..."?) and with .NET there had to be a better way. Due to a dearth of non-Request.ServerVariables examples out there back then, it took trusty trial and error Response.Write tests and the MSDN help to settle on the following:
Request.Url.Scheme + Request.Url.SchemeDelimiter + Request.Url.Authority + Request.Url.PathAndQuery
While I never understood why I still had to parse these together (and I sporadically investigated alternatives), it nevertheless felt so much better than parsing together strings like "://" with icky stuff like Request.ServerVariables("SERVER_NAME").
But yes, there had to be an even better way: a way that resisted forgetfulness and the ensuing battle with more than vague intellisense descriptions. Since I'm slow, it was only today that I found it. My my, sometimes I do miss the obvious:
returns the canonically unescaped form of the URI (i.e. "http://www.example.com:80//thick and thin.htm")
Returns the canonically escaped form of the URI (i.e. http://www.example.com:80//thick%20and%20thin.htm)
And yes, I had tried out AbsoluteUri before (I must have, right?), but for some reason, I still missed it.