Support to URL with whitespaces

[dportoles]

URL with whitespaces cannot be previewed
Even replacing to %20

In example webpage:
http://jsonpdataproxy.appspot.com/static/demo.html

insert:
http://www.idearium-consultores.com/docs/data.csv => OK
http://www.idearium-consultores.com/docs/data%202.csv => Fail

(both files are the same)

Thanks in advance