Exercise 4 - Metadata and Interceptors

You can use Metadata to pass additional request information, such as a authentication token, or a trace ID, across network boundary to another service. Effectively, all metadata key/value pairs are transmitted via HTTP/2 headers. There is no direct access to HTTP/2. Metadata is the abstraction for referring to the header.

• Define the Metadata
  • Using Interceptors to pass Metadata
  • Capture Metadata from Server Interceptor
  • Attach Server Interceptor
• Passing Metadata from a Client
  • Decorate with MetadataUtils
  • Metadata Client Interceptor