tornado virtual url path patching

main.py

# import tornado bits
import tornado.ioloop
import tornado.web

# Import some controllers
from controllers import RequestHandler1, RequestHandler2, RequestHandler3

# original routes
routes = [
    (r'/path1', RequestHandler1),
    (r'/path2', RequestHandler2),
    (r'/path3', RequestHandler3)
]

""" 
# Apache config
<Location /path/to/app>
    ProxyPass http://localhost:8888/path/to/app
    ProxyReverse http://localhost:8888/path/to/app
</Location>
# you can probably have apache proxy from a different url I suppose
"""

PREFIX = '/path/to/app'
# you can stick PREFIX in a config file, just inlined here for demo

for i, orig_route in enumerate(routes):
    """
    * orig_route[0] is the original url path
    * we take that, prepend with PREFIX
    * rebuild the route tuple using iterable := tuple.__add__(iterable)
    """
    routes[i] = ( (PREFIX + orig_route[0],) + orig_route[1:] )

app = tornado.web.Application(routes)

if __name__ == '__main__':
    app.listen(8888)
    tornado.ioloop.IOLoop.current().start()