Chapter 4: Developing Cloud Functions

1. Cloud Functions run on port 8080.
2. The topic trigger is used by Cloud Pub/Sub.
3. Go, Node, and Python are the runtime languages are supported by Google Cloud Functions.
4. The HTTP response code for success is 2xx.
5. The HTTP response code for a client-side error is 4xx.
6. The HTTP response code for a server-side error is 5xx.
7. The purpose of CORS is that it allows resources on the web page to be accessed from another domain.
8. HTTP headers – add access-control-allow-origin to the header name.