The introduction of any new Web technology will affect a network's infrastructure in ways that range from inconsequential to earth shattering. Ajax is one of the more disruptive new Web technologies traveling across networks today. To help you minimize future surprises on your network, we've outlined the 10 things you should take to heart about Ajax.
1) Ajax is an idea, not an acronym
3) XML is not required
Of course, it is possible and certainly reasonable to use XML, but it is far from required. Using binary formats for uploading files is not supported yet by the XMLHttpRequest object, but considering that Flash uses a binary format called Action Message Format, it is likely that similar features will be found in Ajax applications soon enough. You should know which format is being passed around the network, because it isn't always XML. Also, make sure you can analyze the format for performance and security.