Assets return empty reply from server unless {allow_ip_blocks, ["127.0.0.1"]}

[idksup]

On a deploy of HEAD SHA: 3951cdd requests for stylesheets return an "empty status from server" unless the request is from localhost.

Say cb_admin is properly configured under another CB app, and allow_ip_blocks = a public IP, requests to /admin will load the HTML correctly, however the page will not contain styles because when the browser requests to:

/admin/static/stylesheets/application.css?1298394796

CB returns an empty response (also crashes the nginx worker that handled it..)

My workaround is to set allow_ip_blocks to 127.0.0.1 and rewrite the headers to be 127.0.0.1 inside the HTTP server.