Casperjs web service multithread - web-scraping

Question

I am using a CasperJS script as a web service, accessing it from a node server. What I did not manage to do is to make Casper be 'multithread'. If I make two simultaneously requests to Casper from postman the result will be something scrambled between both requests for one response, and the second will be null. I saw that PhantomJS has a page principle, but I did not find anything similar for Casper.
Can i call Casper's web service with multiple requests at the same time and get correct/coherent responses?
Is there some configuration needed for the web server to allow me to do this?
Should the request be done in a 'special manner'? Are there any caveats regarding this that i should be aware of?
If it can only function sequentially, would starting multiple servers on the same machine but different ports solve the issue?
Here is the casper web service i am talking about. When I make a request like
locahost:1338/?query=name.name it will crawl for that query on the
specified url. My problem comes when I make 2 parallel requests with different queries.
//includes web server modules
"use strict";
var port = 1338;
var server = require('webserver').create();
var url = 'url to scrap';
//start web server
var service = server.listen(port, function(request, response) {
var arr1 = [];
var arr2 = [];
var arr3 = [];
var casper = require("casper").create({
verbose: true,
logLevel: 'error',
pageSettings: {
loadImages: false,
loadPlugins: false,
userAgent: 'Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/49.0.2623.87 Safari/537.36'
},
clientScripts: ["vendor/jquery-1.12.1.js"]
});
casper.start(url, function() {
}, function(){
console.log(url + " not found");
return;
});
casper.waitForSelector('.cssClass', function() {
}, function(){
console.log("not found");
return;
});
casper.then(function() {
var query = getQuery(request.url);
casper.sendKeys('.cssClass', query);
casper.click('.cssClass');
casper.waitForSelector('.cssClass', function(){
arr1 = this.evaluate(function(){
var nodeList = document.querySelectorAll(".cssClass");
return Array.prototype.map.call(nodeList, function(node){
return node.textContent;
});
});
}, function(){
console.log("not found");
return;
});
casper.then(function(){
if(names.length > 0)
{
casper.waitForSelector('.cssClass', function(){
arr2 = this.evaluate(function(){
var nodeList = document.querySelectorAll(".cssClass");
return Array.prototype.map.call(nodeList, function(node){
return node.textContent;
});
});
console.log("found");
}, function(){
console.log("not found");
return;
});
casper.waitForSelector('.cssClass', function(){
arr3 = this.evaluate(function(){
var nodeList = document.querySelectorAll(".cssClass");
return Array.prototype.map.call(nodeList, function(node){
return node.src;
});
});
console.log("found");
}, function(){
console.log("not found");
return;
});
}
});
});
casper.run(function() {
response.statusCode = 200;
response.write(JSON.stringify({p1: arr1, p2: arr2, p3: arr3}));
response.close();
});
});
console.log('\nServer running at http://localhost:' + port+'/');