Method - Description

• abort() - Cancels the current request
• getAllResponseHeaders() - Returns the complete set of http headers as a string
• getResponseHeader("headername") - Returns the value of the specified http header
• open("method","URL",async,"uname","pswd") - Specifies the method, URL, and other optional attributes of a request

The method parameter can have a value of "GET", "POST", or "PUT" (use "GET" when requesting data and use "POST" when sending data (especially if the length of the data is greater than 512 bytes.

The URL parameter may be either a relative or complete URL.

The async parameter specifies whether the request should be handled asynchronously or not. true means that script processing carries on after the send() method, without waiting for a response. false means that the script waits for a response before continuing script processing

• send(content) - Sends the request
• setRequestHeader("label","value") - Adds a label/value pair to the http header to be sent

Property Description

• onreadystatechange - An event handler for an event that fires at every state change readyState Returns the state of the object:

• 0 = uninitialized
• 1 = loading
• 2 = loaded
• 3 = interactive
• 4 = complete

• responseText - Returns the response as a string
• responseXML - Returns the response as XML. This property returns an XML document object, which can be examined and parsed using W3C DOM node tree methods and properties
• status - Returns the status as a number (e.g. 404 for "Not Found" or 200 for "OK")
• statusText - Returns the status as a string (e.g. "Not Found" or "OK")

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References
http://www.w3schools.com/dom/dom_http.asp