different object hashed for firefox and chrome

[David Birdsong]

I'm trying to understand how an identical request to Firefox and
Chrome are hashing to a different object in Varnish.

Here's the Firefox request:
http://pastebin.com/RkA9uhMp

Here's the Chrome request:
http://pastebin.com/4pAe8Cac

There are a few differences in the request between the two browsers,
but I've set vcl_hash to only use req.url:
sub vcl_hash {
        set req.hash = req.url;
#       set req.hash += req.url;
#       set req.hash += req.http.host;
        hash;
}

I'm running varnish from trunk at R4390.