NetSender clients should report their vars

Currently NetReceiver variables (aka “vars”) are one-way, i.e., service to client. Users sets vars via the service (NetReceiver or VidGrind) and the service then informs the client that vars have changed by means of updating the var sum. The new vars are then communicated to the client in the body of the response to the /vars request.

If clients were to communicate to the service ahead of time what vars they support, then it would be possible for the service to validate user input and ensure that only valid vars are ever accepted/used. It is proposed that the client send a JSON representation of vars, by extending /vars to use HTTP POST instead of the HTTP GET.

For example:

{ “Input”:string”, “Quantization”:”int”, …}

When a client has posted its vars ahead of time, any var that is not included in the list will be rejected by the service. The type information will also enable the service to perform basic validation.

When a client has NOT posted its vars then any var will be accepted by the service to ensure backwards compatibility.

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