Bug with same origin check behind reverse proxies/load balancers etc.

[davidfowl]

Found while testing signalr on appharbor. The same origin check is failing for normal requests. This is because we have bad url parsing logic in ServerRequest.Owin, in particular:

https://github.com/SignalR/SignalR/blob/release/src/Microsoft.AspNet.SignalR.Owin/ServerRequest.Owin.cs#L139

The request port should be 80 or 443 if a host header is defined but there's no port as part of the host header.

You can observe the effects here:

http://owindump.apphb.com/env

Doesn't happen on windows azure websites (the port is 80):

http://owintest.azurewebsites.net/env

[Xiaohongt]

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