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    /**
     *
     *  Base64 encode / decode
     *  http://www.webtoolkit.info/
     *
     **/

    var Base64 = {

        // private property
        _keyStr: "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=",

        // public method for encoding
        encode: function(input) {
            var output = "";
            var chr1, chr2, chr3, enc1, enc2, enc3, enc4;
            var i = 0;

            input = Base64._utf8_encode(input);

            while(i < input.length) {

                chr1 = input.charCodeAt(i++);
                chr2 = input.charCodeAt(i++);
                chr3 = input.charCodeAt(i++);

                enc1 = chr1 >> 2;
                enc2 = ((chr1 & 3) << 4) | (chr2 >> 4);
                enc3 = ((chr2 & 15) << 2) | (chr3 >> 6);
                enc4 = chr3 & 63;

                if(isNaN(chr2)) {
                    enc3 = enc4 = 64;
                } else if(isNaN(chr3)) {
                    enc4 = 64;
                }

                output = output + this._keyStr.charAt(enc1) + this._keyStr.charAt(enc2) + this._keyStr.charAt(enc3) + this._keyStr.charAt(enc4);

            }

            return output;
        },

        // public method for decoding
        decode: function(input) {
            var output = "";
            var chr1, chr2, chr3;
            var enc1, enc2, enc3, enc4;
            var i = 0;

            input = input.replace(/[^A-Za-z0-9\+\/\=]/g, "");

            while(i < input.length) {

                enc1 = this._keyStr.indexOf(input.charAt(i++));
                enc2 = this._keyStr.indexOf(input.charAt(i++));
                enc3 = this._keyStr.indexOf(input.charAt(i++));
                enc4 = this._keyStr.indexOf(input.charAt(i++));

                chr1 = (enc1 << 2) | (enc2 >> 4);
                chr2 = ((enc2 & 15) << 4) | (enc3 >> 2);
                chr3 = ((enc3 & 3) << 6) | enc4;

                output = output + String.fromCharCode(chr1);

                if(enc3 != 64) {
                    output = output + String.fromCharCode(chr2);
                }
                if(enc4 != 64) {
                    output = output + String.fromCharCode(chr3);
                }

            }

            output = Base64._utf8_decode(output);

            return output;

        },

        // private method for UTF-8 encoding
        _utf8_encode: function(string) {
            string = string.replace(/\r\n/g, "\n");
            var utftext = "";

            for(var n = 0; n < string.length; n++) {

                var c = string.charCodeAt(n);

                if(c < 128) {
                    utftext += String.fromCharCode(c);
                } else if((c > 127) && (c < 2048)) {
                    utftext += String.fromCharCode((c >> 6) | 192);
                    utftext += String.fromCharCode((c & 63) | 128);
                } else {
                    utftext += String.fromCharCode((c >> 12) | 224);
                    utftext += String.fromCharCode(((c >> 6) & 63) | 128);
                    utftext += String.fromCharCode((c & 63) | 128);
                }

            }

            return utftext;
        },

        // private method for UTF-8 decoding
        _utf8_decode: function(utftext) {
            var string = "";
            var i = 0;
            var c = c1 = c2 = 0;

            while(i < utftext.length) {

                c = utftext.charCodeAt(i);

                if(c < 128) {
                    string += String.fromCharCode(c);
                    i++;
                } else if((c > 191) && (c < 224)) {
                    c2 = utftext.charCodeAt(i + 1);
                    string += String.fromCharCode(((c & 31) << 6) | (c2 & 63));
                    i += 2;
                } else {
                    c2 = utftext.charCodeAt(i + 1);
                    c3 = utftext.charCodeAt(i + 2);
                    string += String.fromCharCode(((c & 15) << 12) | ((c2 & 63) << 6) | (c3 & 63));
                    i += 3;
                }

            }

            return string;
        }

    };

    function make_base_auth(user, password) {
        var tok = user + ':' + password;
        var hash = Base64.encode(tok);
        return "Basic " + hash;
    }
    $.ajax({
        type: "get",
        url: "http://localhost:8080/activiti-webapp-rest2/service/tasks?assignee=kermit",
        dataType: "json",
        beforeSend: function(xhr) {
            xhr.setRequestHeader('Authorization', make_base_auth('kermit', '000000'));
        },
        contentType: "application/json",
        success: function(json) {
            console.log("login response - " + json);
        }
    });