dispatch.yaml Configuration File

The dispatch.yaml allows you to override routing rules. You can use the dispatch.yaml to send incoming requests to a specific service (formerly known as modules) based on the path or hostname in the URL.

For more information, see How Requests are Routed.

Deploying the dispatch file

The dispatch.yaml file can reside anywhere in your source code directory.

To deploy the dispatch configuration file without otherwise altering the currently serving version, use one of the following commands in the directory containing your dispatch file, depending on your environment:


gcloud app deploy dispatch.yaml


mvn appengine:deployDispatch dispatch.yaml


gradle appengineDeployDispatch dispatch.yaml


If you use IntelliJ or Eclipse, you select the individual configuration files to be deployed using the deployment form.

For more information about the deployment commands, see Deploying a Java 8 App.


The root element in the dispatch.yaml file is dispatch: and contains a list of routing definitions that are specified by the following subelements.

The rules that you define in your dispatch file must use HTTP URL patterns that include the "." notation for separating subdomains. URLs defined with the HTTPS "-dot-" notation are not supported.

Dispatch rules are order dependent, and can also apply to the URLs that you define in your cron file.

Element Description

Specifies the name of the service that will handle the requests that match the url pattern. Note that services were previously called modules.


In the url element, you define the URL pattern, which can include the host name and URL path that are no longer than 100 characters. For the service element, you specify the name of the service that you want handling any incoming requests that match the URL pattern of the url element.

Tip: You can include glob patterns like the * wildcard character in the url element; however, those patterns can be used only before the host name and at the end of the URL path.

A URL pattern that can include the hostname and URL path. Glob characters can be used to match patterns. The Glob characters can be specified only at the beginning of the pattern and end of the pattern. Specify the URL pattern within quotes.

Note that dispatch rules also apply to URLs that are used in cron configuration or in task queue configuration.

URL paths that begin with /_ah/ are not routed by the dispatch file.


The following is a sample dispatch file that routes requests to http://simple-sample.appspot.com and requests like http://simple-sample.appspot.com/favicon.ico to the default service. All static content is served from the default service. Mobile requests like http://simple-sample.appspot.com/mobile/ are routed to a mobile frontend, and worker requests like http://simple-sample.appspot.com/work/ are routed to a static backend.

  # Default service serves the typical web resources and all static resources.
  - url: "*/favicon.ico"
    service: default

  # Default service serves simple hostname request.
  - url: "simple-sample.appspot.com/"
    service: default

  # Send all mobile traffic to the mobile frontend.
  - url: "*/mobile/*"
    service: mobile-frontend

  # Send all work to the one static backend.
  - url: "*/work/*"
    service: static-backend

If you prefer general routing rules that match many possible requests, you can define rules with wider scopes. For example:

# Send any path that begins with “simple-sample.appspot.com/mobile” to the mobile-frontend service.
- url: "simple-sample.appspot.com/mobile*"
  service: mobile-frontend

# Send any domain/sub-domain with a path that starts with “work” to the static backend service.
- url: "*/work*"
  service: static-backend

You can also write expressions that are more strict:

# Matches the path "/fun", but not "/fun2" or "/fun/other"
- url: "*/fun"
  service: mobile-frontend

# Matches the hostname 'customer1.myapp.com', but not '1.customer1.myapp.com.
- url: "customer1.myapp.com/*"
  service: static-backend


The dispatch file can contain up to 20 routing rules. When specifying the URL string, neither the hostname nor the path can be longer than 100 characters.

Deleting all dispatch rules

To delete all dispatch rules:

  1. Edit the contents of the dispatch.yaml file to:

  2. Deploy the dispatch.yaml file to App Engine.



App Engine standard environment for Java 8