Returns the value of the given HTTP response header
open(method, url, async, username, password)
Creates an HTTP request with the given method (GET or POST) to the given URL. The other parameters are optional: whether to use an asynchronous call (default) or not, and credentials for HTTP Authentication
send(content)
Sends the HTTP request, optionally providing data to send with it (POST information)
setRequestHeader(name, value)
Adds a header with the given name and value to the HTTP request
