Probe auth on Github with DotNetOpenAuth 3.5.0 library

Unexpected response Content-Type text/html

DotNetOpenAuth.DLL!DotNetOpenAuth.Messaging.ErrorUtilities.VerifyProtocol(bool condition, string message, object[] args) Line 237   C#
        DotNetOpenAuth.DLL!DotNetOpenAuth.Messaging.ErrorUtilities.ThrowProtocol(string message, object[] args) Line 257    C#
        DotNetOpenAuth.DLL!DotNetOpenAuth.OAuth2.ChannelElements.OAuth2ClientChannel.ReadFromResponseCore(DotNetOpenAuth.Messaging.IncomingWebResponse response) Line 67 + 0x1a4 bytes  C#
        DotNetOpenAuth.DLL!DotNetOpenAuth.Messaging.Channel.RequestCore(DotNetOpenAuth.Messaging.IDirectedProtocolMessage request) Line 659 + 0xe bytes C#
        DotNetOpenAuth.DLL!DotNetOpenAuth.Messaging.Channel.Request(DotNetOpenAuth.Messaging.IDirectedProtocolMessage requestMessage) Line 477 + 0xe bytes  C#
        DotNetOpenAuth.DLL!DotNetOpenAuth.OAuth2.ClientBase.UpdateAuthorizationWithResponse(DotNetOpenAuth.OAuth2.IAuthorizationState 开发者_开发百科authorizationState, DotNetOpenAuth.OAuth2.Messages.EndUserAuthorizationSuccessAuthCodeResponse authorizationSuccess) Line 204 + 0x19 bytes    C#
        DotNetOpenAuth.DLL!DotNetOpenAuth.OAuth2.WebServerClient.ProcessUserAuthorization(DotNetOpenAuth.Messaging.HttpRequestInfo request) Line 118 + 0xf bytes    C#

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By the looks of it, either the server is buggy, or it's running an incompatible version of OAuth 2.0 (there are only 13 drafts of that unfinalized spec out there in use today). This is one reason to not use OAuth 2.0 in production until it's finalized.