A tiny XMLHttpRequest wrapper.

taquito.js

function XHR(url = "/", verb = "GET", data = null) {
	this.requestor = null;
	this.url = url;
	this.verb = verb;
	this.data = data;
}
XHR.prototype.executor = function (resolve, reject) {
	this.requestor.onreadystatechange = () => this.stateChange(resolve, reject);
	this.requestor.ontimeout = () => this.timeout(resolve, reject);
	this.requestor.onerror = reject;
	this.requestor.open(this.verb, this.url);
	this.requestor.setRequestHeader("X-Requested-With", "XMLHttpRequest");
	this.requestor.send(this.data);
};
XHR.prototype.stateChange = function (resolve, reject) {
	if (this.requestor.readyState !== 4) return;
	if (this.requestor.status >= 200 && this.requestor.status < 400) resolve(this.requestor.response);
	else reject(new Error("Failed to load \"" + this.url + "\"\nHTTP Error " + this.requestor.status + " " + this.requestor.statusText));
	this.requestor = null;
};
XHR.prototype.timeout = function (resolve, reject) {
	reject(new Error("Failed to load \"" + this.url + "\"\nRequest Timed Out"));
};
XHR.prototype.run = function () {
	this.requestor = new XMLHttpRequest();
	this.requestor.timeout = 30000;
	this.requestor.responseType = "text";
	return new Promise((resolve, reject) => this.executor(resolve, reject));
};
function ajax(url = "/", verb = "GET", data = null) {
	return new XHR(url, verb, data).run();
}