Regex match of hexdigest in google app engine webapp WSGIApplication

Question

application = webapp.WSGIApplication(
    [(r'/main/profile/([a-f0-9]{40})', ProfileHandler)],
    debug=True)

The regex in the above parameter will not recognize a 40 hex long hexdigest in Google App Engine.

I'm getting 404s instead of ProfileHandler being passed the matching 40 hex long profile ID. My app.yaml passes everything /main/.* to the correct python script so that's not the issue. The regex looks sane and resembles the example regex in GAE docs. What is wrong with this regex?

Answer 1

I have no experience with the Google App Engine, but:

• what happens if you change ([a-f0-9]{40}) in to ([a-fA-F0-9]{40})
• are you sure group $1 is used and not the entire match (including /main/profile/)?

Answer 2

I can not reproduce your problem. Here is an exact code I have:

index.py

from google.appengine.ext import webapp
from google.appengine.ext.webapp.util import run_wsgi_app

class ProfileHandler(webapp.RequestHandler): 
    def get(self, *ar, **kw):
        self.response.out.write("PROFILE IS:" + ar[0])

run_wsgi_app(webapp.WSGIApplication(
[(r'/main/profile/([a-f0-9]{40})', ProfileHandler),],
                                 debug=True))

app.yaml

application: someapp
version: 1
runtime: python
api_version: 1

handlers:
- url: /main/.*
  script: index.py

Application is listening on port 8082

GET: http://localhost:8082/main/profile/4c4f630aef49c0065c22eb3dd35a00f5787f4816
RESPONSE: PROFILE IS:4c4f630aef49c0065c22eb3dd35a00f5787f4816