server/backend/routes/connectors.js
function serviceCall(req, res, next) {
        connector.runCall(req.params.connection, req.params.call, req.body).then(res.json.bind(res), next).done();
    }
function serviceCall(req, res, next) {
        connector.runCall(req.params.connection, req.params.call, req.body).then(res.json.bind(res), next).done();
    }
function serviceCall ( req , res , next ) { connector . runCall ( req . params . connection , req . params . call , req . body ) . then ( res . json . bind ( res ) , next ) . done ( ) ; }
calls directly into a service connection.

@param req containing body JSON to pass as input.
@param res result of call is provided as JSON body data.
@param next function to invoke error handling.
calls directly into a service connection .