two node.js services are started. Service A forwards the request to B, and the 
 An agent is configured as follows: 
 var proxy = require ("http-proxy-middleware"); 
 app.use (" / api",proxy ({
target:"http:192.168.10.111:3000",
secure:false,
changeOrigin: true})); 
 result forwarding is An error Error occurred while trying to proxy request / api/2018-06-13 from localhost:4001 to  http:192.168.10.111 : 3000 (ECONNREFUSED) 
