google app engine sending mail twice

Question

I wrote a sample code to send email from google app engine in Python. I'm not able to figure out why is it sending out every mail twice? mail.py:- from google.appengine.api import mail mail.send_mail(sender="ALPHA ", to="BETA ", subject="test mail", body=""" Dear BETA, How have you been? Regards, ALPHA """) app.yaml:- application: MyUniqueAppID version: 1 runtime: python api_version: 1 handlers: - url: .* script: mail.py JavaScript questions and answers, JavaScript questions pdf, JavaScript question bank, JavaScript questions and answers pdf, mcq on JavaScript pdf, JavaScript questions and solutions, JavaScript mcq Test , Interview JavaScript questions, JavaScript Questions for Interview, JavaScript MCQ (Multiple Choice Questions)

Answer 1

If that really is your app.yaml, then any request to your app is going to result in a mail being sent. If you visit the site with a web-browser, it will first make a request for /, then probably also make a request for /favicon.ico and potentially other unintended requests. Each resulting in a mail being sent. You should: Make your url route in app.yaml more specific than .* Not just place your code directly in the module scope as you appear to have done for mail.py. Modules can get cached and although this will work, it might not work like that forever, so use the webbapp framework to create a propper application/handler within mail.py