Explain how a proxy is used for an Ajax request. Why do you need to run an app using Ajax from a web server to test it rather than opening it as a local file? Why do you not normally send a Connection...

Explain how a proxy is used for an Ajax request. Why do you need to run an app using Ajax from a web server to test it rather than opening it as a local file? Why do you not normally send a Connection header with a value of close? Explain why incorporating content from another domain using JSON-P opens a potential security hole in your website.