gistfile1.js

var requests = {};

self.onmessage = function (e)
{
    var action = e.data.action,
        data = e.data;
    
    switch (action)
    {
        case "send":
            req = new WorkerRequest(data.rid, data.service, data.body);
            requests[data.rid] = req;
            req.perform();
            break;
        
        case "abort":
            req = requests[data.rid];
            req.abort();
            delete requests[data.rid];
            break;
    }
}

WorkerRequest = function(rid, service, body)
{
    this.rid = rid;
    this.service = service;
    this.body = body;
    this._xhr = new XMLHttpRequest();
}

WorkerRequest.prototype = {
    
    perform: function()
    {       
        this._xhr.addEventListener("readystatechange", this, false);
        this._xhr.open("POST", this.service);
        this._xhr.send(this.body);
        //self.postMessage({"rid": this.rid, "readyState": this._xhr.readyState, "status": this._xhr.status, "responseText": this._xhr.responseText});
    },
    
    abort: function()
    {
        this._xhr.removeEventListener("readystatechange", this, false);
        this._xhr.abort();
    },

    handleEvent: function(e)
    {
        self.postMessage({"rid": this.rid, "readyState": e.target.readyState, "status": e.target.status, "responseText": e.target.responseText});
    }
}