title: default properties for all urls in app.yaml
body: <p>My app.yaml file has many different url handlers, but there are some properties that must be in every one of them. For instance, a <code>secure: always</code> property. How can I make this a default property and avoid having to manually add this to every handler? </p>
  
  <pre><code>handlers:
  - url: /api/.+
    script: backend.api.app
    secure: always
  
  - url: /.*
    static_files: static/pages/build/index.html
    upload: static/pages/build/index.html
    secure: always
  </code></pre>
  
  <p>I am worried that I will add a url and forget to copy all of my default properties into it.</p>
  
  <p>Note:
  I use Grunt, so if it is impossible to do this though Google App Engine a solution that parses the YAML file and adds properties could work</p>