dynmap/web/chat.js

function sendChat(message) {
	var ip;
	$.ajax({
		type: "GET",
		url: "http://jsonip.appspot.com/?callback=?",
		dataType: "jsonp",
		success: function(getip) {
		    var data = { name: getip.ip, message: message };
			$.ajax({
				type: 'POST',
				url: '/up/sendmessage',
				data: data,
				dataType: 'json',
				success: function(response) {
					//handle response
				}
			});
		}
	});
}
//curl -d '{"name":"Nickname","message":"Hello"}' http://localhost:8123/up/sendmessage