[plt-scheme] Possible bug getting requests from non-complete urls.

On Dec  8, Patrick wrote:
> I'm experiencing a weird issue...
> 
> Here's a test case:
> #lang scheme
> ...
> (define site-url "http://www.circuitcity.com")

That's the problem -- net/url sends a line like:

  GET  HTTP/1.0

which is bogus, according to the HTTP RFC -- I fixed it to use "/" if
the path is empty, following what the RFC says:

  Note that the absolute path cannot be empty; if none is present in
  the original URI, it must be given as "/" (the server root).

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