Code reproduce a web.py bug caused with Python 3

unibug.py

"""Program to reproduce a bug that appears when used with Python 3.

How to reproduce:

1. Run the dev server

  $ python unibug.py
  http://0.0.0.0:8080/
  
2. Open the following URL in your browser.

http://0.0.0.0:8080/

3. See the server crash with UnicodeEncodeError

"""
import web

urls = ("/", "index")
app = web.application(urls, globals())

class index:
    def GET(self):
        return "\u0C05\u0C06"

if __name__ == "__main__":
    app.run()