Turns out open-uri raises an SocketError and no HTTPError

Author: gr4y

lib/jekyll-gist/gist_tag.rb

@@ -62,7 +62,7 @@ def fetch_raw_code(gist_id, filename = nil)
         end
         begin
           open(uri).read.chomp
-        rescue OpenURI::HTTPError => e
+        rescue SocketError
           nil
         end
       end