Document message pack response format

[jsternberg]

URL for relevant page?

influxdata/influxdb#8897

What products and version are you using?

InfluxDB 1.4.x

Document that message pack can be used for responses with application/x-msgpack and that it is the recommended format going forward and is required for accurate responses with int64 and uint64 since JSON doesn't support integers above 2^53.

The method to use this format is by setting application/x-msgpack in the Accept header. For clients that may need to talk to versions of the server that do not support message pack, they should be prepared to receive application/json even if they requested application/x-msgpack.

[lovasoa]

@stevebang Any news ? That feature is almost two years old now and has never been documented.

[stevebang]

Closing for now. I discussed with @jsternberg -- "uint64 never got actually enabled in 1.x unless built specially" and to avoid the "recommended format going forward"; he's not even sure how important it is to be documented.