Question

I’m just getting started with Tornado and I was wondering how i can define a mapping so that all requests like below are are handled by a single handler.

1. /products/list
2. /products/find/123
3. /products/copy/123

4. /products/{action}/{argument1}/{argument2}/{argument3}

   class Application(tornado.web.Application):
       def __init__(self):
           handlers = [
               (r"/", home.HomeHandler),
               (r"/products/", product.ProductHandler)]
   
   class ProductHandler(base.BaseHandler):   
     def get(self, action, *args):
             self.write("Action:" + action + "<br>")
                   for arg in args:
                       self.write("argument:" + arg + "<br>")
   

Answer 1

You aren’t limited to listing a RequestHandler just once in the url matching, so you can do one of two things: Add a pattern explicitly matching each of the patterns you mention above like so:

def __init__(self):
    handlers = [
        (r"/", home.HomeHandler),
        (r"/products/list/([0-9]+)", product.ProductHandler)
        (r"/products/find/([0-9]+)", product.ProductHandler)
        (r"/products/copy/([0-9]+)", product.ProductHandler)
        (r"/products/(\w+)/(\w+)/(\w+)", product.ProductHandler)]

Or you could say that “any URL that begins with “products” should be sent to the product handler,” like so:

def __init__(self):
    handlers = [
        (r"/", home.HomeHandler),
        (r"/products/list/(.*)", product.ProductHandler)

and parse the variable list yourself in the ProductHandler.