DotNetOpenAuth CTP - Facebook bad request

Question

I am trying to use the CTP to connect with Facebook over OAuth 2.0.

I can get the initial request to Facebook working OK, but when it comes back and we call:

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Answer 1

I've been, intermittently, experiencing this same issue myself when I was utilising the returnTo parameter of WebServerClient's PrepareRequestUserAuthorization(). Only certain returnTo URIs would experience an issue... the URIs I was passing in had a Base64 component to them. Some of which contained a = in them. If I URL Encode these URLs I get "A potentially dangerous Request.Path value was detected from the client (%)" error from my local server.

Until I can find a, better, solution I am performing some prodding on the string before passing it in;

localReturnTo = localReturnTo.Replace("=", "_")

Then when I receive my response I perform the reverse;

returnedUri = returnedUri.Replace("_", "=")

It's not pretty. But it does get around the immediate (similar) problem I was experiencing.