IIS ASP.net, by default, prohibits service of many file extensions,
.cs is one.
So the request is being killed by
IIS ASP.net before it hits the REST handlers.
This can be fixed fairly easily by striking the following entry, if so desired...
<add path="*.cs" verb="*" type="System.Web.HttpForbiddenHandler" validate="True"/>
But subverting ASP doesn't seem to be a solution to me.
Perhaps naked links like that can be rendered with a filter that contains the forbidden extensions and just munge them a bit as systempuntoout has demonstrated.
Or perhaps add a filter to tag creation to prevent such tags from being created. But I think i like the munge better.
But the bottom line is that something should be done, otherwise arbitrary numbers of tag links are just going to be bad. It is not so apparent here, but on SO...
hey, i wonder...
Sure enough https://stackoverflow.com/questions/tagged/.cs
Nice catch Steffen.
And of course this is just my supposition. I am not privy to the inner workings of the SO servers.
But I do have a bit of experience with how an HttpWorkerRequest behaves.
If anyone needs a better dev server than the one that comes with VS08 or VS10 you can get one here