add wrapper which create the object in 3 ways using try and catch
use open method to configure a request
use getResponseHeader and getAllResponseHeaders unctions to inspect headers that the server sent back
show status property of the file
use open, send and request
set the onreadystatechange property of an object to a function
add responseXML property to hold a representation of a document
add a JSON document file
add eval function
add serializeJSON function
add simpleHttpRequest function