Resource interpreted as Document but transferred with MIME type application/zip

With Chrome 12.0.742.112, if I redirect with the following headers:

HTTP/1.1 302 Found 
Location: http://0.0.0.0:3000/files/download.zip
Content-Type: text/html; charset=utf-8
Cache-Control: no-cache
X-Ua-Compatible: IE=Edge
X-Runtime: 0.157964
Content-Length: 0
Server: WEBrick/1.3.1 (Ruby/1.9.2/2011-02-18)
Date: Tue, 05 Jul 2011 18:42:25 GMT
Connection: Keep-Alive

Which if followed returns the following header:

HTTP/1.1 200 OK 
Last-Modified: Tue, 05 Jul 2011 18:18:30 GMT
Content-Type: application/zip
Content-Length: 150014
Server: WEBrick/1.3.1 (Ruby/1.9.2/2011-02-18)
Date: Tue, 05 Jul 2011 18:44:47 GMT
Connection: Keep-Alive

Chrome will not redirect, nor change the previous page, it'll just report the following warning in the console:

Resource interpreted as Document but transferred with MIME type application/zip.

The process works correctly in Firefox, and also works fine in Chrome if I open a new tab and go directly to http://0.0.0.0:3000/files/download.zip. Am I doing something wrong, or is this a bug/quirk of Chrome?