What is wrong with this redirect? (Google App Engine - Python)

Question

In SubmitHandler I get the submitted url :

    url = self.request.get("url").rstrip().lstrip()

and check if its length is zero and if it is zero i redirect to /urlparseerror :

    if len(url) == 0:
        logging.info("""***len(url) is --zero--: %s***""" % len(url))
        self.redirect("/urlparseerror")

but for some reason the redirect is not executed. According to logging.info len(url) is zero:

***len(url) is --zero--: 0***

What am I doing wrong?

Answer 1

redirect() will not end the execution of the rest of your code. So if after the snippet you have posted, your code goes on to return some other kind of response your redirect will be ignored. If this is the case, stick a return in to cause the response to be returned.

if len(url) == 0:
    logging.info("""***len(url) is --zero--: %s***""" % len(url))
    self.redirect("/urlparseerror")
    return