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Preview web apps | Cloud Shell

Preview web apps

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This page describes how to use the web preview feature in Cloud Shell. This feature allows you to run web applications on the Cloud Shell virtual machine instance and preview them from the Google Cloud console.

The Web Preview button can be found on the top right of the Cloud Shell taskbar.

Start the web application

You can run any web application that listens to HTTP requests on the Cloud Shell virtual machine, including the App Engine development server. The web application must listen for HTTP requests on ports within the permitted range 2000 to 65000. These ports are only available to the secure Cloud Shell proxy service, which restricts access over HTTPS to your user account only.

Simple server example

To start a simple Python HTTP server from the Cloud Shell command prompt:

cd `mktemp -d` \
    && echo '<html><body>Hello World</body></html>' >./index.html \
    && python -m http.server 8080
App Engine development server example

To clone a sample App Engine application and run it on the App Engine development server:

git clone https://github.com/GoogleCloudPlatform/appengine-guestbook-python \
    && cd appengine-guestbook-python \
    && dev_appserver.py ./app.yaml

The development server runs on port 8080 by default.

Preview the application

Click the Web Preview button and then select the port number from the displayed menu. Cloud Shell opens the preview URL on its proxy service in a new browser window.

You can also access the preview URL by combining the port with the environment variable WEB_HOST in the Cloud Shell terminal using the format https://$PORT-$WEB_HOST, or by using the Cloud Shell API.

Accessing Streamlit applications

Web preview in Cloud Shell works through a series of HTTP proxies. Streamlit applications require additional arguments to function when running behind an HTTP proxy. When running these applications, make sure you specify --browser.serverAddress=localhost --server.enableCORS=false --server.enableXsrfProtection=false on the command line.

Except as otherwise noted, the content of this page is licensed under the Creative Commons Attribution 4.0 License, and code samples are licensed under the Apache 2.0 License. For details, see the Google Developers Site Policies. Java is a registered trademark of Oracle and/or its affiliates.

Last updated 2025-08-07 UTC.

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