Getting App Engine Modules to work

Question

I'm learning about Google App Engine modules, but I can't seem to get them running on the dev_appserver, not even by downloading and using their sample application.

According to the sample application, all requests sent to /work or /mobile would be dispatched to the corresponding module.

However, when I send request to http://localhost:8080/work or http://localhost:8080/mobile, it returns a 404.

• app.yaml
• dispatch.yaml
• mobile_frontend.yaml
• static_backend.yaml

I start the dev_appserver using the command line:

dev_appserver.py appengine-modules-helloworld-python-master

And I get:

INFO     2014-06-23 09:39:16,375 sdk_update_checker.py:242] Checking for updates to the SDK.
INFO     2014-06-23 09:39:16,673 sdk_update_checker.py:286] This SDK release is newer than the advertised release.
WARNING  2014-06-23 09:39:16,678 api_server.py:378] Could not initialize images API; you are likely missing the Python "PIL" module.
INFO     2014-06-23 09:39:16,682 api_server.py:171] Starting API server at: http://localhost:61790
INFO     2014-06-23 09:39:16,686 dispatcher.py:182] Starting module "default" running at: http://localhost:8080
INFO     2014-06-23 09:39:16,692 admin_server.py:117] Starting admin server at: http://localhost:8000

According to documentation, I should be seeing more lines telling me that the other modules are being started on different ports, but I dont get that for some reason.

Then, if I run the following code:

import webapp2
from google.appengine.api import modules

class MainPage(webapp2.RequestHandler):
    def get(self):
        self.response.headers['Content-Type'] = 'text/plain'
        self.response.write('Hello, webapp2 World!\n%s\n%s' % (modules.get_modules(), modules.get_hostname()))

APP = webapp2.WSGIApplication([('/', MainPage),], debug=True)

It results in:

Hello, webapp2 World!
['default']
localhost:8080

As if the non-default modules have not been loaded...

Whats the proper way of setting up module and making them work both on local development server as well as in production?

Thanks

Answer 1

You have the wrong app names in the yaml files. The names should match what you use when you start the local server in the dev_appserver.py command: appengine-modules-helloworld-python-master. Switch it in the command or the yaml files so they match.

You also need to startup the modules in the dev server:

dev_appserver.py dispatch.yaml app.yaml mobile_frontend.yaml static_backend.yaml