Google App Engine app.yaml settings file to serve multilingual Angular application

app.yaml

runtime: python27 # simplest hosting option in Google App Engine
api_version: 1
threadsafe: true # 
service: myangularapp # could be 'default' if you have only one service
instance_class: F1 # minimal machine 
automatic_scaling:
  min_instances: 1 # always-on
  max_instances: 1 # significant load is not expected for SPA app javascript package

handlers:
# serve assets directly
- url: /(.*\.(gif|png|jpg|css|js|woff|woff2|ttf|eot|svg|ico)(|\.map))$
  static_files: myangularapp/\1
  upload: myangularapp/(.*)(|\.map)
# html page for OIDC implicit flow token refresh
- url: /fr/silent-refresh.html
  static_files: myangularapp/fr/silent-refresh.html
  upload: myangularapp/fr/silent-refresh.html
- url: /en/silent-refresh.html
  static_files: myangularapp/en/silent-refresh.html
  upload: myangularapp/en/silent-refresh.html 
# redirect all other request to index page
- url: /fr/(.*)
  static_files: myangularapp/fr/index.html
  upload: myangularapp/fr/index.html
- url: /en/(.*)
  static_files: myangularapp/en/index.html
  upload: myangularapp/en/index.html
# default root page to redirect to English or French home pages
- url: /(.*)
  static_files: myangularapp/default.html
  upload: myangularapp/default.html