How to use _getFakeClientResponse method in Cypress

...76 * Instead of directly manipulating the response by using `res.status`, `res.setHeader`, etc.,77 * generating an IncomingMessage allows us to treat the response the same as any other "real"78 * HTTP response, which means the proxy layer can apply response middleware to it.79 */80function _getFakeClientResponse(opts) {81    var clientResponse = new http_1.IncomingMessage(new net_1.Socket);82    // be nice and infer this content-type for the user83    if (!caseInsensitiveGet(opts.headers || {}, 'content-type') && is_html_1.default(opts.body)) {84        opts.headers['content-type'] = 'text/html';85    }86    lodash_1.default.merge(clientResponse, opts);87    return clientResponse;88}89var caseInsensitiveGet = function (obj, lowercaseProperty) {90    for (var _i = 0, _a = Object.keys(obj); _i < _a.length; _i++) {91        var key = _a[_i];92        if (key.toLowerCase() === lowercaseProperty) {93            return obj[key];94        }95    }96};97function setBodyFromFixture(getFixtureFn, staticResponse) {98    return __awaiter(this, void 0, void 0, function () {99        function getBody() {100            // NOTE: for backwards compatibility with cy.route101            if (data === null) {102                return '';103            }104            if (!lodash_1.default.isBuffer(data) && !lodash_1.default.isString(data)) {105                // TODO: probably we can use another function in fixtures.js that doesn't require us to remassage the fixture106                return JSON.stringify(data);107            }108            return data;109        }110        var fixture, data, headers;111        return __generator(this, function (_a) {112            switch (_a.label) {113                case 0:114                    fixture = staticResponse.fixture;115                    if (!fixture) {116                        return [2 /*return*/];117                    }118                    return [4 /*yield*/, getFixtureFn(fixture.filePath, { encoding: fixture.encoding })];119                case 1:120                    data = _a.sent();121                    headers = staticResponse.headers;122                    if (!headers || !caseInsensitiveGet(headers, 'content-type')) {123                        lodash_1.default.set(staticResponse, 'headers.content-type', xhrs_1.parseContentType(data));124                    }125                    staticResponse.body = getBody();126                    return [2 /*return*/];127            }128        });129    });130}131exports.setBodyFromFixture = setBodyFromFixture;132/**133 * Using an existing response object, send a response shaped by a StaticResponse object.134 * @param res Response object.135 * @param staticResponse BackendStaticResponse object.136 * @param onResponse Will be called with the response metadata + body stream137 * @param resStream Optionally, provide a Readable stream to be used as the response body (overrides staticResponse.body)138 */139function sendStaticResponse(res, staticResponse, onResponse) {140    if (staticResponse.forceNetworkError) {141        res.connection.destroy();142        res.destroy();143        return;144    }145    var statusCode = staticResponse.statusCode || 200;146    var headers = staticResponse.headers || {};147    var body = staticResponse.body || '';148    var incomingRes = _getFakeClientResponse({149        statusCode: statusCode,150        headers: headers,151        body: body,152    });153    var bodyStream = getBodyStream(body, lodash_1.default.pick(staticResponse, 'throttleKbps', 'continueResponseAt'));154    onResponse(incomingRes, bodyStream);155}156exports.sendStaticResponse = sendStaticResponse;157function getBodyStream(body, options) {158    var continueResponseAt = options.continueResponseAt, throttleKbps = options.throttleKbps;159    var delayMs = continueResponseAt ? lodash_1.default.max([continueResponseAt - Date.now(), 0]) : 0;160    var pt = new stream_1.PassThrough();161    var sendBody = function () {162        var writable = pt;...