endpoints.js

        var endpoints = null;

        function addEndpoint(url) {
            var i;
            if (endpoints == null) {
                endpoints = getEndpoints();
            }
            url = url.trim();
            if (url.charAt(url.length - 1) != '/') {
                url += "/";
            }
            for (i = 0; i < endpoints.length; i++) {
                if (endpoints[i].url == url) {
                    return;
                }
            }
            endpoints.push({ url: url });
            localStorage.setItem("endpoints", JSON.stringify(endpoints));
        }

        function removeEndpoint(url) {
            var i;

            if (endpoints == null) {
                endpoints = getEndpoints();
            }

            for (i = 0; i < endpoints.length; i++) {
                if (endpoints[i].url == url) {
                    endpoints.slice(i);
                    localStorage.setItem("endpoints", endpoints);
                    break;
                }
                i++;
            }
        }

        function getEndpoints() {
            if (endpoints != null && endpoints instanceof Array) {
                return endpoints;
            }
            endpointsJson = localStorage.getItem("endpoints");
            if (endpointsJson == null) {
                return [];
            }
            try {
                endpoints = JSON.parse(endpointsJson);
                return endpoints instanceof Array ? endpoints : [];
            } catch (err) {
                console.log("getEndpoints() failed to parse JSON: " + endpointsJson);
                console.dir(err);
                return [];
            }
        }