Media type for confluent wire-format

[thake]

We are currently adopting the CloudEvent specification (https://cloudevents.io/) for our records written to kafka.

When trying to correctly write the datacontenttype for a record value, we wondered which media type we should use.

Our CloudEvent data is encoded using the KafkaJsonSchemaSerializer. The Serializer uses the confluent wire-format https://docs.confluent.io/platform/current/schema-registry/serdes-develop/index.html#wire-format. Because of the prepended magic byte and schema ID, the datacontenttype cannot be application/json. Is there a defined media type for the confluent wire-format?

[OneCricketeer]

The data going to kafka is simply binary, so if you're using logic of type == application/json + a simple json parser, then that's obviously not going to work.

You can find what the server uses as HTTP media types at

https://docs.confluent.io/platform/current/schema-registry/installation/config.html

You can see in the spec, using vnd prefix is allowed - https://www.iana.org/assignments/media-types/media-types.xhtml#application, but this repo has no specifications for actually adhering to CloudEvents spec