Responses.md

Responses - are an abstraction for the underlying callback it be a callback to AWS lambda/Gateway or to NODE.js http socket

A 400 response might look like this if using AWS Api gateway

module.exports = function(data, callback){
    callback(null, {
        statusCode : 400,
        body : JSON.stringify({
            code : 400,
            message : 'bad',
            data : data
        }, null, 3)
    });
};

Note how data and callback are the parameters

Data is assumed as the only real parameter to a response call
callback is injected using the injector internally
other injectables are injectable via putting them in the function signature! (not best practice with responses though)