hi guys!
I realized there're two problems in our shinning Guildhall.

1. When "http-download" calls "relative-uri", the first arg should be a
string, say "srfi", but ("srfi").
2. I can install single package perfectly, but if there're several
dependencies, guildhall will throw a timeout.
    eg. guild hall install spells, the first dependency will be installed
perfectly, but the second will give me a long time no response then timeout.

So I changed the connection to keep-alive mode. And everything's OK now.

A patch is attached.