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Kevin Buchs
Asked: 2019-12-14 08:06:41 +0800 CST

Need help understanding the relationship of custom domain names and services in App Engine

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I will freely admit that I am a newbie to GCP App Engine. I am the inheritor of a complex configuration that seems to have grown organically with multiple chefs and no code to back it up and documentation? Hah! So, I am looking at a list of Custom domain names (App Engine -> Settings -> Custom domains) that are CNAMES with aliases that are similar to the Services in App Engine, except periods in the aliases seemingly translate to dashes in the services. When viewing the services I see many have Dispatch routes. There is no dispatch.yml file I have, however. I am trying to determine the connections here between the dots. So:

1) Do the periods get automatically mapped to dashes? 2) If the above is "no", then is there some other mapping of custom domain names to services? 3) How can I find the source of the Dispatch routes?

google-cloud-platform

1 Answers

  1. Best Answer
    1. No. A service name in App Engine can only contain numbers, letters and hyphens (can't contain ".").
    2. Requests can be routed using App Engine's default routing or using a dispatch file (which should be the case if the application has many services and custom domain mappings). Find all the relevant information of how requests are routed here. I recommend you to read that documentation extensively, as well as how to map custom domains in order to fully understand how this is done.
    3. In order to view the source files (app.yaml, dispatch.yaml, etc.) go to the Google Cloud Platform Console's App Engine services section and click on Tools -> Debug and you should see the dispatch.yaml file under the Deployed files section.

    In order to understand how to structure the services and related resources in an App Engine application refer to this documentation. Please read it carefully in order to understand how web services are structured in App engine.

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