function addRequestBreadcrumb(event, url, req, res) {
    if (!getCurrentHub().getIntegration(Http)) {
        return;
    }
    getCurrentHub().addBreadcrumb({
        category: 'http',
        data: {
            method: req.method,
            status_code: res && res.statusCode,
            url: url,
        },
        type: 'http',
    }, {
        event: event,
        request: req,
        response: res,
    });
}
Captures Breadcrumb based on provided request/response pair