--- ruby-rack-ssl-1.3.3/lib/rack/ssl.rb~	2014-04-02 19:55:52.453292794 +0000
+++ ruby-rack-ssl-1.3.3/lib/rack/ssl.rb	2014-04-02 20:01:41.201824043 +0000
@@ -55,6 +55,8 @@
                                         'Location'     => url.to_s)
 
         [status, headers, []]
+      rescue URI::InvalidURIError
+        [400, {"Content-Type" => "text/plain"}, []]
       end
 
       # http://tools.ietf.org/html/draft-hodges-strict-transport-sec-02