source: Dev/trunk/src/client/dojox/rpc/JsonRPC.js

define("dojox/rpc/JsonRPC", ["dojo", "dojox", "dojox/rpc/Service", "dojo/errors/RequestError"], function(dojo, dojox, Service, RequestError) {

        function jsonRpcEnvelope(version){
                return {
                        serialize: function(smd, method, data, options){
                                //not converted to json it self. This  will be done, if
                                //appropriate, at the transport level
        
                                var d = {
                                        id: this._requestId++,
                                        method: method.name,
                                        params: data
                                };
                                if(version){
                                        d.jsonrpc = version;
                                }
                                return {
                                        data: dojo.toJson(d),
                                        handleAs:'json',
                                        contentType: 'application/json',
                                        transport:"POST"
                                };
                        },
        
                        deserialize: function(obj){
                                if ('Error' == obj.name // old xhr
                                        || obj instanceof RequestError // new xhr
                                ){
                                        obj = dojo.fromJson(obj.responseText);
                                }
                                if(obj.error) {
                                        var e = new Error(obj.error.message || obj.error);
                                        e._rpcErrorObject = obj.error;
                                        return e;
                                }
                                return obj.result;
                        }
                };
        }
        dojox.rpc.envelopeRegistry.register(
                "JSON-RPC-1.0",
                function(str){
                        return str == "JSON-RPC-1.0";
                },
                dojo.mixin({namedParams:false}, jsonRpcEnvelope()) // 1.0 will only work with ordered params
        );

        dojox.rpc.envelopeRegistry.register(
                "JSON-RPC-2.0",
                function(str){
                        return str == "JSON-RPC-2.0";
                },
                dojo.mixin({namedParams:true }, jsonRpcEnvelope("2.0")) // 2.0 supports named params
        );

});