Exercise 6 - Metadata and Interceptors ====================================== You can use Metadata to pass additional request information, such as an 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. .. toctree:: :maxdepth: 2 metadata clientmetadata