eth_connector.js
function send(method, params, callback) {
            if (typeof params === "function") {
                callback = params;
                params = [];
            }

            self.web3.currentProvider.sendAsync({
                jsonrpc: "2.0",
                method,
                params: params || [],
                id: new Date().getTime(),
            }, callback);
        }
function send(method, params, callback) {
            if (typeof params === "function") {
                callback = params;
                params = [];
            }

            self.web3.currentProvider.sendAsync({
                jsonrpc: "2.0",
                method,
                params: params || [],
                id: new Date().getTime(),
            }, callback);
        }
function send ( method , params , callback ) { if ( typeof params === "function" ) { callback = params ; params = [ ] ; } self . web3 . currentProvider . sendAsync ( { jsonrpc : "2.0" , method , params : params || [ ] , id : new Date ( ) . getTime ( ) , } , callback ) ; }
CALL a low level rpc
CALL a low level rpc