> Advantages:
> XMLHttpRequest - Can make requests to pages not set up for AJAX Can
> set/get all HTTP headers Can make HTTP requests using any type (GET,
> POST, PROPFIND, and so on)Supports full control over POST requests,
> allowing for any type of data encoding
> IFrame - Can make POST and GET HTTP requests Supportes all modern
> browsers Supports asynchronous file uploads
> Cookies - Supports the largest number of browsers Few implementation
> differences between browsers
> Disadvantages:
> XMLHttpRequest - Requests ActiveX to be enabled in IE 5 and 6 Is only
> available in newer versions of Opera and Safari Has small
> implementation differences between browsers
> IFrame - Prohibits synchronous requests Server pages must be designed
> to work with IFrame requests Has implementation differences between
> browsers Can leave extra entries in browser history (depends on browser
> and implementation) All request data is URL-encoded, increasing request
> size
> Cookies - Prohibits no synchronous requests Doesn't work with large
> requests/results Requires server pages to be designed to work with
> cookie requests Requires polling on the client Can make only GET HTTP
> requests
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