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Storing and serving static files | Google App Engine standard environment docs

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Applications often need to serve static files such as JavaScript, images, and CSS in addition to handling dynamic requests. Apps in the standard environment can serve static files from a Google Cloud option like Cloud Storage, serve them directly, or use a third-party content delivery network (CDN).

Hosting your static site on Google Cloud can cost less than using a traditional hosting provider, as Google Cloud provides a

.

Cloud Storage can host static assets for dynamic web apps. The benefits of using Cloud Storage instead of serving directly from your app include:

• Cloud Storage essentially works as a content delivery network. This does not require any special configuration because by default any publicly readable object is cached in the global Cloud Storage network.
• Your app's load will be reduced by offloading serving static assets to Cloud Storage. Depending on how many static assets you have and the frequency of access, this can reduce the cost of running your app by a significant amount.
• Bandwidth charges for accessing content can often be less with Cloud Storage.

You can upload your assets to Cloud Storage by using the Google Cloud CLI or the Cloud Storage API.

The Google Cloud Client Library provides an idiomatic client to Cloud Storage, for storing and retrieving data with Cloud Storage in an App Engine app.

This example creates a Cloud Storage bucket and uploads static assets using the gcloud CLI:

1. Create a bucket. It's common, but not required, to name your bucket after your project ID. The bucket name must be globally unique.

   gcloud storage buckets create gs://<var>your-bucket-name</var>
   

2. Set the IAM policy to grant public read access to items in the bucket.

   gcloud storage buckets add-iam-policy-binding gs://<var>your-bucket-name</var> --member=allUsers --role=roles/storage.objectViewer
   

3. Upload items to the bucket. The rsync command is typically the fastest and easiest way to upload and update assets. You could also use cp.

   gcloud storage rsync ./static gs://<var>your-bucket-name</var>/static --recursive
   

You can now access your static assets via https://storage.googleapis.com/<var>your-bucket-name</var>/static/....

For more details on how to use Cloud Storage to serve static assets, including how to serve from a custom domain name, refer to How to Host a Static Website.

You also have the option of using Cloud CDN or other Google Cloud storage services.

To serve static files in the standard environment, you define the handlers in your app.yaml file using either the static_dir or static_files elements.

The content in the static files or static directories are unaffected by the scaling settings in your app.yaml file. Requests to static files or static directories are handled by the App Engine infrastructure directly, and do not reach the language runtime of the application.

To configure your app to serve the ./public directory from the /static URL, you define a handler in your app.yaml file.

The following demonstrates how to serve the static files of a sample app's ./public directory. The template for this app's index.html page instructs the browser to load the main.css file, for example:

<link type="text/css" rel="stylesheet" href="/static/css/main.css">

The ./public directory is defined in the static_dir element of the project's app.yaml file:

handlers:
  - url: /favicon\.ico
    static_files: favicon.ico
    upload: favicon\.ico

  - url: /static
    static_dir: public

  - url: /.*
    secure: always
    redirect_http_response_code: 301
    script: auto

The handlers section in the above example handles three URL patterns:

• The /favicon.ico handler maps a request specifically for /favicon.ico to a file named favicon.ico in the app's root directory.

• The /static handler maps requests for URLs that start with /static. When App Engine receives a request for a URL beginning with /static, it maps the remainder of the path to files in the ./public directory. If an appropriate file is found in the directory, the contents of that file are returned to the client.

• The /.* handler matches all other URLs and directs them to your app.

URL path patterns are tested in the order they appear in app.yaml, therefore the pattern for your static files should be defined before the /.* pattern. For more information, see the app.yaml reference.

You can use any external third-party CDN to serve your static files and cache dynamic requests but your app might experience increased latency and cost.

For improved performance, you should use a third-party CDN that supports CDN Interconnect.

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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