koa middleware, sniffer on request and response than request to api
npm install httpsniffer``
$ npm install --save httpsniffer
const sniffer = require('httpsniffer')
// api - backend http log api address
// blackurl - default route.all('/') api address
// apptag - app name
app.use(sniffer.logSniffer({"api":"http://localhost:4600/api/v3_5/httplog", blackurl: "http://localhost:3000/", apptag:"onionsBackend"}))
app.use(router.routes())
``