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jquery / jquery.methodhack.js
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(function($) {
 
var _ajax = $.ajax;
$.ajax = function(options) {
	if(options && $.inArray(options.type, ["PUT", "DELETE"]) != -1) {
		var method = options.type;
		var setup = options.beforeSend;
		options.type = "POST";
		options.beforeSend = function(xhr) {
			xhr.setRequestHeader("X-HTTP-Method", method);
			if(setup) {
				return setup.apply(this, arguments);
			} else {
				return true;
			}
		};
	}
	_ajax.apply(this, arguments);
};
 
})(jQuery);