Regex-Based aliases

Hello,
I tried to add in my site.yaml this route (from documentation:

routes:
   /another/(.*): '/blog/$1'

If I go to http://mysite.com/another/focus-and-blur I wait until a message "Bad gateway". I tried with various regex but the result is the same.
Why?

Thanks

I am also seeing this, so I'm pretty sure we are following the docs correctly.

I just logged an issue as I need this too and there may be a recently introduced bug.

Are you running PHP5 and/or Nginx @samuele?