I need await request in app.post and use request outside function. I wrote some code, it works, but sometimes it freezes

receivePost(url, response) {
const app = this.app;
return new Promise( (resolve, reject) => {
  app.post(url, async (req, res) => {
    res.send(response)
    try {
      resolve(req.body);
    } catch {
      reject();
    }
    req.end();
  });
});
}

The problem arises when I am trying get request twice and more. I try restart Server with function this.app.listen and this.server.destroy between usage.