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+/**
+ * Wrapper for built-in http.js to emulate the browser XMLHttpRequest object.
+ *
+ * This can be used with JS designed for browsers to improve reuse of code and
+ * allow the use of existing libraries.
+ *
+ * Usage: include("XMLHttpRequest.js") and use XMLHttpRequest per W3C specs.
+ *
+ * @todo SSL Support
+ * @author Dan DeFelippi <dan@driverdan.com>
+ * @license MIT
+ */
+
+var Url = require("url")
+	,sys = require("util");
+
+exports.XMLHttpRequest = function() {
+	/**
+	 * Private variables
+	 */
+	var self = this;
+	var http = require('http');
+	var https = require('https');
+
+	// Holds http.js objects
+	var client;
+	var request;
+	var response;
+	
+	// Request settings
+	var settings = {};
+	
+	// Set some default headers
+	var defaultHeaders = {
+		"User-Agent": "node.js",
+		"Accept": "*/*",
+	};
+	
+	var headers = defaultHeaders;
+	
+	/**
+	 * Constants
+	 */
+	this.UNSENT = 0;
+	this.OPENED = 1;
+	this.HEADERS_RECEIVED = 2;
+	this.LOADING = 3;
+	this.DONE = 4;
+
+	/**
+	 * Public vars
+	 */
+	// Current state
+	this.readyState = this.UNSENT;
+
+	// default ready state change handler in case one is not set or is set late
+	this.onreadystatechange = function() {};
+
+	// Result & response
+	this.responseText = "";
+	this.responseXML = "";
+	this.status = null;
+	this.statusText = null;
+		
+	/**
+	 * Open the connection. Currently supports local server requests.
+	 *
+	 * @param string method Connection method (eg GET, POST)
+	 * @param string url URL for the connection.
+	 * @param boolean async Asynchronous connection. Default is true.
+	 * @param string user Username for basic authentication (optional)
+	 * @param string password Password for basic authentication (optional)
+	 */
+	this.open = function(method, url, async, user, password) {
+		settings = {
+			"method": method,
+			"url": url,
+			"async": async || null,
+			"user": user || null,
+			"password": password || null
+		};
+		
+		this.abort();
+
+		setState(this.OPENED);
+	};
+	
+	/**
+	 * Sets a header for the request.
+	 *
+	 * @param string header Header name
+	 * @param string value Header value
+	 */
+	this.setRequestHeader = function(header, value) {
+		headers[header] = value;
+	};
+	
+	/**
+	 * Gets a header from the server response.
+	 *
+	 * @param string header Name of header to get.
+	 * @return string Text of the header or null if it doesn't exist.
+	 */
+	this.getResponseHeader = function(header) {
+		if (this.readyState > this.OPENED && response.headers[header]) {
+			return header + ": " + response.headers[header];
+		}
+		
+		return null;
+	};
+	
+	/**
+	 * Gets all the response headers.
+	 *
+	 * @return string 
+	 */
+	this.getAllResponseHeaders = function() {
+		if (this.readyState < this.HEADERS_RECEIVED) {
+			throw "INVALID_STATE_ERR: Headers have not been received.";
+		}
+		var result = "";
+		
+		for (var i in response.headers) {
+			result += i + ": " + response.headers[i] + "\r\n";
+		}
+		return result.substr(0, result.length - 2);
+	};
+
+	/**
+	 * Sends the request to the server.
+	 *
+	 * @param string data Optional data to send as request body.
+	 */
+	this.send = function(data) {
+		if (this.readyState != this.OPENED) {
+			throw "INVALID_STATE_ERR: connection must be opened before send() is called";
+		}
+		
+		var ssl = false;
+		var url = Url.parse(settings.url);
+		
+		// Determine the server
+		switch (url.protocol) {
+			case 'https:':
+				ssl = true;
+				// SSL & non-SSL both need host, no break here.
+			case 'http:':
+				var host = url.hostname;
+				break;
+			
+			case undefined:
+			case '':
+				var host = "localhost";
+				break;
+			
+			default:
+				throw "Protocol not supported.";
+		}
+
+		// Default to port 80. If accessing localhost on another port be sure
+		// to use http://localhost:port/path
+		var port = url.port || (ssl ? 443 : 80);
+		// Add query string if one is used
+		var uri = url.pathname + (url.search ? url.search : '');
+		
+		// Set the Host header or the server may reject the request
+		this.setRequestHeader("Host", host);
+		
+		// Set content length header
+		if (settings.method == "GET" || settings.method == "HEAD") {
+			data = null;
+		} else if (data) {
+			this.setRequestHeader("Content-Length", Buffer.byteLength(data));
+			
+			if (!headers["Content-Type"]) {
+				this.setRequestHeader("Content-Type", "text/plain;charset=UTF-8");
+			}
+		}
+
+		// Use the proper protocol
+		var doRequest = ssl ? https.request : http.request;
+
+		var options = {
+		    host: host,
+		    port: port,
+		    path: uri,
+		    method: settings.method,
+		    headers: headers, 
+                    agent: false
+		};
+		
+		var req = doRequest(options, function(res) {
+			response = res;
+			response.setEncoding("utf8");
+
+			setState(self.HEADERS_RECEIVED);
+			self.status = response.statusCode;
+
+			response.on('data', function(chunk) {
+				// Make sure there's some data
+				if (chunk) {
+					self.responseText += chunk;
+				}
+				setState(self.LOADING);
+			});
+
+			response.on('end', function() {
+				setState(self.DONE);
+			});
+
+			response.on('error', function() {
+				self.handleError(error);
+			});
+		}).on('error', function(error) {
+			self.handleError(error);
+		});
+
+		req.setHeader("Connection", "Close");
+
+		// Node 0.4 and later won't accept empty data. Make sure it's needed.
+		if (data) {
+			req.write(data);
+		}
+
+		req.end();
+	};
+
+	this.handleError = function(error) {
+		this.status = 503;
+		this.statusText = error;
+		this.responseText = error.stack;
+		setState(this.DONE);
+	};
+
+	/**
+	 * Aborts a request.
+	 */
+	this.abort = function() {
+		headers = defaultHeaders;
+		this.readyState = this.UNSENT;
+		this.responseText = "";
+		this.responseXML = "";
+	};
+	
+	/**
+	 * Changes readyState and calls onreadystatechange.
+	 *
+	 * @param int state New state
+	 */
+	var setState = function(state) {
+		self.readyState = state;
+		self.onreadystatechange();
+	}
+};