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Showing content from http://cloud.google.com/appengine/docs/standard/python3/building-app/writing-web-service below:

Write a basic web service for App Engine | Google App Engine standard environment docs

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Write and locally test a web service that serves a static HTML file using Flask. Then, create the configuration files that you need for deploying the web service to App Engine.

In this step, you create and locally test a version of a web service that displays placeholder data. The goal here is to ensure that your basic web service is working before adding Datastore and Firebase authentication.

1. If you have not already created a Google Cloud project, create a Google Cloud project.

2. If you have not already, set up your local environment for Python 3 development by completing the following:

   • Download and install Python 3 for developing your web service and running the Google Cloud CLI.

   • Use your Google Cloud user credentials to authenticate with the Google Cloud CLI and enable local testing with Datastore:

     gcloud auth application-default login
     

     Tip: For more extensive testing, it is recommended that you set up a service account rather than using user-end credentials. For more information on service accounts and other types of authentication, see Authentication Overview.

The project directory where you create your web service will have the following file structure:

• building-an-app/
  • app.yaml
  • main.py
  • requirements.txt
  • static/
    • script.js
    • style.css
  • templates/
    • index.html

The following sections provide an example of how to set up the files in your project directory.

The initial iteration of your web service uses Flask to serve a Jinja-based HTML template.

To set up your web service:

1. Create your templates/index.html file:

2. Add behaviors and styles with static/script.js and static/style.css files:

3. In your main.py file, use Flask to render your HTML template with the placeholder data:

4. Configure all dependencies you will need for your web service in your requirements.txt file:

Test your web service by running it locally in a virtual environment:

1. Create an isolated Python environment:

   python3 -m venv env
   source env/bin/activate

2. If you're not in the directory that contains the sample code, navigate to the directory that contains the hello_world sample code. Then install dependencies:

   cd YOUR_SAMPLE_CODE_DIR
   pip install -r requirements.txt

3. Run the application:

   python main.py

4. In your web browser, enter the following address:

   http://localhost:8080

Use PowerShell to run your Python packages.

1. Locate your installation of PowerShell.
2. Right-click on the shortcut to PowerShell and start it as an administrator.
3. Create an isolated Python environment.

   python -m venv env
   .\env\Scripts\activate

4. Navigate to your project directory and install dependencies. If you're not in the directory that contains the sample code, navigate to the directory that contains the hello_world sample code. Then, install dependencies:

   cd YOUR_SAMPLE_CODE_DIR
   pip install -r requirements.txt

5. Run the application:

   python main.py

6. In your web browser, enter the following address:

   http://localhost:8080

To deploy your web service to App Engine, you need an app.yaml file. This configuration file defines your web service's settings for App Engine.

To configure your web service for deployment to App Engine, create your app.yaml file in the root directory of your project, for example building-an-app:

Notice that for this simple web service, your app.yaml file needs to define only the runtime setting and handlers for static files.

For more complicated web services, you can configure additional settings in your app.yaml, like scaling, additional handlers, and other application elements like environment variables and service names. For more information and a list of all the supported elements, see the app.yaml reference.

Now that you've configured, created, and tested your web service, you can deploy this version of your web service to App Engine.

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.

[[["Easy to understand","easyToUnderstand","thumb-up"],["Solved my problem","solvedMyProblem","thumb-up"],["Other","otherUp","thumb-up"]],[["Hard to understand","hardToUnderstand","thumb-down"],["Incorrect information or sample code","incorrectInformationOrSampleCode","thumb-down"],["Missing the information/samples I need","missingTheInformationSamplesINeed","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-08-07 UTC."],[[["This guide provides instructions for creating and testing a Python web service using Flask, which serves a static HTML file and placeholder data."],["The web service's file structure includes `app.yaml`, `main.py`, `requirements.txt`, a `static/` directory for CSS and JavaScript, and a `templates/` directory for the HTML file."],["Before deploying the service, you should set up a local Python 3 environment, install required dependencies using `pip`, and test the application locally by running `python main.py` and navigating to `http://localhost:8080` in a browser."],["Deploying to Google App Engine requires an `app.yaml` file that specifies the Python runtime and defines handlers for static files, with more settings available for complex services."],["For new Python web services on Google Cloud, it's recommended to start with Cloud Run instead of App Engine, for which there is a provided quickstart link."]]],[]]

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