https://cloud.google.com/shell/docs/using-web-preview#previewing_the_application code example
Example 1: https://cloud.google.com/shell/docs/using-web-preview#previewing_the_application
cd `mktemp -d` \
&& echo '<html><body>Hello World</body></html>' >./index.html \
&& python -m SimpleHTTPServer 8080
Example 2: https://cloud.google.com/shell/docs/using-web-preview#previewing_the_application
git clone https://github.com/GoogleCloudPlatform/appengine-guestbook-python \
&& cd appengine-guestbook-python \
&& dev_appserver.py ./app.yaml