nodejs/curl http request is slow compared to postman rest client

Question

I call a Rest API from node.js and Postman-Rest Client (chrome app). Always using the same computer, same endpoint and same parameters.

In node.js I get ~400ms for http and ~700ms for https. In Postman I get ~250ms for http and https.

Libraries I used in node.js: http, https, request, kinvey (node client of the api). All of them got the the same result more or less.

Why my node is slower?

node.js 0.10.36

Edit: it's not about node, i get the same result with curl. when running in browser using XMLHttpRequest i get better times. from analysing the logs I found that TCP connect and SSL handshake takes about 500ms. It may be that TCP connect and SSL handshake works differently in browser.

Answer 1

Here you can find some help. I am also facing issues with nodejs application server on linux instance. But dont blame nodejs as real issue is in linux systems.

Issue : any outbound request from machine need to find the domain , hence it always lookup the DNS entries & always handshakes with secure/unsecure protocols. This is actually the time taking scenario. You can verify by doing CURL request.

curl --trace-time -v https://outboundserver.com

Solution : We have to White List IP of outbound server in our own DNS entries. take a look below ...

IN Windows : automatically does the mapping of servers in own dns entries.

IN Linux : We have to manually add the hosts corresponding to IP Address. Manually add an entry in /etc/hosts file below any configuration like localhost.

127.0.0.1 localhost outbound.servers.ip.address www.outboundserver.com

Finally check with the curl request again, it should give faster response.

curl --trace-time -v https://outboundserver.com