diff --git a/backend/src/main/resources/jmeter/bin/base64.js b/backend/src/main/resources/jmeter/bin/base64.js
new file mode 100644
index 0000000000..b3cab12d48
--- /dev/null
+++ b/backend/src/main/resources/jmeter/bin/base64.js
@@ -0,0 +1,319 @@
+//
+// THIS FILE IS AUTOMATICALLY GENERATED! DO NOT EDIT BY HAND!
+//
+;
+(function (global, factory) {
+    typeof exports === 'object' && typeof module !== 'undefined'
+        ? module.exports = factory()
+        : typeof define === 'function' && define.amd
+            ? define(factory) :
+            // cf. https://github.com/dankogai/js-base64/issues/119
+            (function () {
+                // existing version for noConflict()
+                var _Base64 = global.Base64;
+                var gBase64 = factory();
+                gBase64.noConflict = function () {
+                    global.Base64 = _Base64;
+                    return gBase64;
+                };
+                if (global.Meteor) { // Meteor.js
+                    Base64 = gBase64;
+                }
+                global.Base64 = gBase64;
+            })();
+}((typeof self !== 'undefined' ? self
+    : typeof window !== 'undefined' ? window
+        : typeof global !== 'undefined' ? global
+            : this), function () {
+    'use strict';
+    /**
+     *  base64.ts
+     *
+     *  Licensed under the BSD 3-Clause License.
+     *    http://opensource.org/licenses/BSD-3-Clause
+     *
+     *  References:
+     *    http://en.wikipedia.org/wiki/Base64
+     *
+     * @author Dan Kogai (https://github.com/dankogai)
+     */
+    var version = '3.7.2';
+    /**
+     * @deprecated use lowercase `version`.
+     */
+    var VERSION = version;
+    var _hasatob = typeof atob === 'function';
+    var _hasbtoa = typeof btoa === 'function';
+    var _hasBuffer = typeof Buffer === 'function';
+    var _TD = typeof TextDecoder === 'function' ? new TextDecoder() : undefined;
+    var _TE = typeof TextEncoder === 'function' ? new TextEncoder() : undefined;
+    var b64ch = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=';
+    var b64chs = Array.prototype.slice.call(b64ch);
+    var b64tab = (function (a) {
+        var tab = {};
+        a.forEach(function (c, i) { return tab[c] = i; });
+        return tab;
+    })(b64chs);
+    var b64re = /^(?:[A-Za-z\d+\/]{4})*?(?:[A-Za-z\d+\/]{2}(?:==)?|[A-Za-z\d+\/]{3}=?)?$/;
+    var _fromCC = String.fromCharCode.bind(String);
+    var _U8Afrom = typeof Uint8Array.from === 'function'
+        ? Uint8Array.from.bind(Uint8Array)
+        : function (it, fn) {
+            if (fn === void 0) { fn = function (x) { return x; }; }
+            return new Uint8Array(Array.prototype.slice.call(it, 0).map(fn));
+        };
+    var _mkUriSafe = function (src) { return src
+        .replace(/=/g, '').replace(/[+\/]/g, function (m0) { return m0 == '+' ? '-' : '_'; }); };
+    var _tidyB64 = function (s) { return s.replace(/[^A-Za-z0-9\+\/]/g, ''); };
+    /**
+     * polyfill version of `btoa`
+     */
+    var btoaPolyfill = function (bin) {
+        // console.log('polyfilled');
+        var u32, c0, c1, c2, asc = '';
+        var pad = bin.length % 3;
+        for (var i = 0; i < bin.length;) {
+            if ((c0 = bin.charCodeAt(i++)) > 255 ||
+                (c1 = bin.charCodeAt(i++)) > 255 ||
+                (c2 = bin.charCodeAt(i++)) > 255)
+                throw new TypeError('invalid character found');
+            u32 = (c0 << 16) | (c1 << 8) | c2;
+            asc += b64chs[u32 >> 18 & 63]
+                + b64chs[u32 >> 12 & 63]
+                + b64chs[u32 >> 6 & 63]
+                + b64chs[u32 & 63];
+        }
+        return pad ? asc.slice(0, pad - 3) + "===".substring(pad) : asc;
+    };
+    /**
+     * does what `window.btoa` of web browsers do.
+     * @param {String} bin binary string
+     * @returns {string} Base64-encoded string
+     */
+    var _btoa = _hasbtoa ? function (bin) { return btoa(bin); }
+        : _hasBuffer ? function (bin) { return Buffer.from(bin, 'binary').toString('base64'); }
+            : btoaPolyfill;
+    var _fromUint8Array = _hasBuffer
+        ? function (u8a) { return Buffer.from(u8a).toString('base64'); }
+        : function (u8a) {
+            // cf. https://stackoverflow.com/questions/12710001/how-to-convert-uint8-array-to-base64-encoded-string/12713326#12713326
+            var maxargs = 0x1000;
+            var strs = [];
+            for (var i = 0, l = u8a.length; i < l; i += maxargs) {
+                strs.push(_fromCC.apply(null, u8a.subarray(i, i + maxargs)));
+            }
+            return _btoa(strs.join(''));
+        };
+    /**
+     * converts a Uint8Array to a Base64 string.
+     * @param {boolean} [urlsafe] URL-and-filename-safe a la RFC4648 §5
+     * @returns {string} Base64 string
+     */
+    var fromUint8Array = function (u8a, urlsafe) {
+        if (urlsafe === void 0) { urlsafe = false; }
+        return urlsafe ? _mkUriSafe(_fromUint8Array(u8a)) : _fromUint8Array(u8a);
+    };
+    // This trick is found broken https://github.com/dankogai/js-base64/issues/130
+    // const utob = (src: string) => unescape(encodeURIComponent(src));
+    // reverting good old fationed regexp
+    var cb_utob = function (c) {
+        if (c.length < 2) {
+            var cc = c.charCodeAt(0);
+            return cc < 0x80 ? c
+                : cc < 0x800 ? (_fromCC(0xc0 | (cc >>> 6))
+                    + _fromCC(0x80 | (cc & 0x3f)))
+                    : (_fromCC(0xe0 | ((cc >>> 12) & 0x0f))
+                        + _fromCC(0x80 | ((cc >>> 6) & 0x3f))
+                        + _fromCC(0x80 | (cc & 0x3f)));
+        }
+        else {
+            var cc = 0x10000
+                + (c.charCodeAt(0) - 0xD800) * 0x400
+                + (c.charCodeAt(1) - 0xDC00);
+            return (_fromCC(0xf0 | ((cc >>> 18) & 0x07))
+                + _fromCC(0x80 | ((cc >>> 12) & 0x3f))
+                + _fromCC(0x80 | ((cc >>> 6) & 0x3f))
+                + _fromCC(0x80 | (cc & 0x3f)));
+        }
+    };
+    var re_utob = /[\uD800-\uDBFF][\uDC00-\uDFFFF]|[^\x00-\x7F]/g;
+    /**
+     * @deprecated should have been internal use only.
+     * @param {string} src UTF-8 string
+     * @returns {string} UTF-16 string
+     */
+    var utob = function (u) { return u.replace(re_utob, cb_utob); };
+    //
+    var _encode = _hasBuffer
+        ? function (s) { return Buffer.from(s, 'utf8').toString('base64'); }
+        : _TE
+            ? function (s) { return _fromUint8Array(_TE.encode(s)); }
+            : function (s) { return _btoa(utob(s)); };
+    /**
+     * converts a UTF-8-encoded string to a Base64 string.
+     * @param {boolean} [urlsafe] if `true` make the result URL-safe
+     * @returns {string} Base64 string
+     */
+    var encode = function (src, urlsafe) {
+        if (urlsafe === void 0) { urlsafe = false; }
+        return urlsafe
+            ? _mkUriSafe(_encode(src))
+            : _encode(src);
+    };
+    /**
+     * converts a UTF-8-encoded string to URL-safe Base64 RFC4648 §5.
+     * @returns {string} Base64 string
+     */
+    var encodeURI = function (src) { return encode(src, true); };
+    // This trick is found broken https://github.com/dankogai/js-base64/issues/130
+    // const btou = (src: string) => decodeURIComponent(escape(src));
+    // reverting good old fationed regexp
+    var re_btou = /[\xC0-\xDF][\x80-\xBF]|[\xE0-\xEF][\x80-\xBF]{2}|[\xF0-\xF7][\x80-\xBF]{3}/g;
+    var cb_btou = function (cccc) {
+        switch (cccc.length) {
+            case 4:
+                var cp = ((0x07 & cccc.charCodeAt(0)) << 18)
+                    | ((0x3f & cccc.charCodeAt(1)) << 12)
+                    | ((0x3f & cccc.charCodeAt(2)) << 6)
+                    | (0x3f & cccc.charCodeAt(3)), offset = cp - 0x10000;
+                return (_fromCC((offset >>> 10) + 0xD800)
+                    + _fromCC((offset & 0x3FF) + 0xDC00));
+            case 3:
+                return _fromCC(((0x0f & cccc.charCodeAt(0)) << 12)
+                    | ((0x3f & cccc.charCodeAt(1)) << 6)
+                    | (0x3f & cccc.charCodeAt(2)));
+            default:
+                return _fromCC(((0x1f & cccc.charCodeAt(0)) << 6)
+                    | (0x3f & cccc.charCodeAt(1)));
+        }
+    };
+    /**
+     * @deprecated should have been internal use only.
+     * @param {string} src UTF-16 string
+     * @returns {string} UTF-8 string
+     */
+    var btou = function (b) { return b.replace(re_btou, cb_btou); };
+    /**
+     * polyfill version of `atob`
+     */
+    var atobPolyfill = function (asc) {
+        // console.log('polyfilled');
+        asc = asc.replace(/\s+/g, '');
+        if (!b64re.test(asc))
+            throw new TypeError('malformed base64.');
+        asc += '=='.slice(2 - (asc.length & 3));
+        var u24, bin = '', r1, r2;
+        for (var i = 0; i < asc.length;) {
+            u24 = b64tab[asc.charAt(i++)] << 18
+                | b64tab[asc.charAt(i++)] << 12
+                | (r1 = b64tab[asc.charAt(i++)]) << 6
+                | (r2 = b64tab[asc.charAt(i++)]);
+            bin += r1 === 64 ? _fromCC(u24 >> 16 & 255)
+                : r2 === 64 ? _fromCC(u24 >> 16 & 255, u24 >> 8 & 255)
+                    : _fromCC(u24 >> 16 & 255, u24 >> 8 & 255, u24 & 255);
+        }
+        return bin;
+    };
+    /**
+     * does what `window.atob` of web browsers do.
+     * @param {String} asc Base64-encoded string
+     * @returns {string} binary string
+     */
+    var _atob = _hasatob ? function (asc) { return atob(_tidyB64(asc)); }
+        : _hasBuffer ? function (asc) { return Buffer.from(asc, 'base64').toString('binary'); }
+            : atobPolyfill;
+    //
+    var _toUint8Array = _hasBuffer
+        ? function (a) { return _U8Afrom(Buffer.from(a, 'base64')); }
+        : function (a) { return _U8Afrom(_atob(a), function (c) { return c.charCodeAt(0); }); };
+    /**
+     * converts a Base64 string to a Uint8Array.
+     */
+    var toUint8Array = function (a) { return _toUint8Array(_unURI(a)); };
+    //
+    var _decode = _hasBuffer
+        ? function (a) { return Buffer.from(a, 'base64').toString('utf8'); }
+        : _TD
+            ? function (a) { return _TD.decode(_toUint8Array(a)); }
+            : function (a) { return btou(_atob(a)); };
+    var _unURI = function (a) { return _tidyB64(a.replace(/[-_]/g, function (m0) { return m0 == '-' ? '+' : '/'; })); };
+    /**
+     * converts a Base64 string to a UTF-8 string.
+     * @param {String} src Base64 string.  Both normal and URL-safe are supported
+     * @returns {string} UTF-8 string
+     */
+    var decode = function (src) { return _decode(_unURI(src)); };
+    /**
+     * check if a value is a valid Base64 string
+     * @param {String} src a value to check
+      */
+    var isValid = function (src) {
+        if (typeof src !== 'string')
+            return false;
+        var s = src.replace(/\s+/g, '').replace(/={0,2}$/, '');
+        return !/[^\s0-9a-zA-Z\+/]/.test(s) || !/[^\s0-9a-zA-Z\-_]/.test(s);
+    };
+    //
+    var _noEnum = function (v) {
+        return {
+            value: v, enumerable: false, writable: true, configurable: true
+        };
+    };
+    /**
+     * extend String.prototype with relevant methods
+     */
+    var extendString = function () {
+        var _add = function (name, body) { return Object.defineProperty(String.prototype, name, _noEnum(body)); };
+        _add('fromBase64', function () { return decode(this); });
+        _add('toBase64', function (urlsafe) { return encode(this, urlsafe); });
+        _add('toBase64URI', function () { return encode(this, true); });
+        _add('toBase64URL', function () { return encode(this, true); });
+        _add('toUint8Array', function () { return toUint8Array(this); });
+    };
+    /**
+     * extend Uint8Array.prototype with relevant methods
+     */
+    var extendUint8Array = function () {
+        var _add = function (name, body) { return Object.defineProperty(Uint8Array.prototype, name, _noEnum(body)); };
+        _add('toBase64', function (urlsafe) { return fromUint8Array(this, urlsafe); });
+        _add('toBase64URI', function () { return fromUint8Array(this, true); });
+        _add('toBase64URL', function () { return fromUint8Array(this, true); });
+    };
+    /**
+     * extend Builtin prototypes with relevant methods
+     */
+    var extendBuiltins = function () {
+        extendString();
+        extendUint8Array();
+    };
+    var gBase64 = {
+        version: version,
+        VERSION: VERSION,
+        atob: _atob,
+        atobPolyfill: atobPolyfill,
+        btoa: _btoa,
+        btoaPolyfill: btoaPolyfill,
+        fromBase64: decode,
+        toBase64: encode,
+        encode: encode,
+        encodeURI: encodeURI,
+        encodeURL: encodeURI,
+        utob: utob,
+        btou: btou,
+        decode: decode,
+        isValid: isValid,
+        fromUint8Array: fromUint8Array,
+        toUint8Array: toUint8Array,
+        extendString: extendString,
+        extendUint8Array: extendUint8Array,
+        extendBuiltins: extendBuiltins
+    };
+    //
+    // export Base64 to the namespace
+    //
+    // ES5 is yet to have Object.assign() that may make transpilers unhappy.
+    // gBase64.Base64 = Object.assign({}, gBase64);
+    gBase64.Base64 = {};
+    Object.keys(gBase64).forEach(function (k) { return gBase64.Base64[k] = gBase64[k]; });
+    return gBase64;
+}));
\ No newline at end of file