I have build a node.js app for establishing connections with keep-alive, event-stream post request with some external server. I send 400 of them and keep acting on received data using data event from request node package. I also listen to the end, response and error events.
When I run the application from localhost everything works perfectly according to plan. However, when I push it to Openshift, only first 5 requests work as intended, the rest just... disappears. I don't get any error, I don't get any response, nor end. I tried sending the requests in with some delay between them, I tried looking for information about maximum requests, I debugged it thoroughly - nothing works. Does anybody have an idea, basing on this description of the problem, how to make all 400 request work (or have an answer why they won't)?
I found the solution for that problem myself. It appeared, that the Request.js library couldn't establish more connections then 5 due to the default agent.maxSockets property of the http server set to that number in 0.10 version of Node.js. Although I had not been requiring http package directly, the Request.js library used it. All I had to do to fix that was to put the following code in the main application module:
var http = require('http');
http.globalAgent.maxSockets = 500; //Or any other number you want
Btw. the default value has been changed to infinity already in the 0.12 version of Node.js.