req.url value replacement issue

[Crowder, Travis]

I was working to replace a value in req.url in vcl_recv and I was having some issues getting a new value into req.url.  I tried replacing it with nothing via set req.url = "" and I also tried using regsub.  It turns out that if you try to set req.url to an empty value, nothing happens.  I ended up having to use set req.url = "/";

Is this expected and documented behavior?

-Travis

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