App Engine Cron Job Always return HTTP status code 301

Question

I have followed this guide to create cron job for my Rails app, but the HTTP status code is always returns 301 and my job status is failed. Am I missing something?

controller:

class CronsController < ApplicationController
  def example
    if request.headers["X-Appengine-Cron"]
      Example.do_something
      head :ok
    else
      head :not_found
    end
  end
end

routes:

get 'crons/example', to: 'crons#example'

cron.yaml

cron:
  - description: my cron example
  url: /crons/example
  schedule: every 2 hours from 03:00 to 07:00

result from gcloud app logs read

2017-08-26 07:00:05 default[20170823t153316]  "GET /crons/example" 301

Answer 1

Two possibilities, both issues because app engine cron does not follow redirects:

• Does Rails add trailing slashes to routes by default? I had the same issue with Django and this turned out to be the cause. I updated the route in cron.yaml to include the trailing slash (in your case url: /crons/example/) and that fixed it.
• Is your application redirecting to https? If so, you may need to exempt this route.