--8<---------------cut here---------------start------------->8---
scheme@(guile-user)> (use-modules(web client)(web uri))
scheme@(guile-user)> (http-get (string->uri "http://www.sqlite.org/"))
web/http.scm:768:6: In procedure parse-asctime-date:
web/http.scm:768:6: Bad Date header: Thu, 24  Jan 2013 21:53:01 +0000
--8<---------------cut here---------------end--------------->8---

RFC 1123 reads:

       There is a strong trend towards the use of numeric timezone
       indicators, and implementations SHOULD use numeric timezones
       instead of timezone names.  However, all implementations MUST
       accept either notation.  If timezone names are used, they MUST
       be exactly as defined in RFC-822.

Here’s a tentative patch to fix it: