Post request not working when helmet.js enabled in node.js!

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Node.js

request

I have a node.js app that uploads images through the code below

app.post("/uploadImage", requiresAuth(), (req, res) => {
  upload(req, res, (err) => {
    if(err) {
      console.log(err);
    }else {
      console.log(req.file);
    }
  });
  res.redirect(req.get('referer'));
});

It works totally fine
But when I enable helmet.js like this:

app.use(helmet({
  contentSecurityPolicy: false,
}));

when I send the post request It shows my website's 404 error page.

how can I fix it?
seems that helmet is blocking my request!
GET requests are working fine but POST requests show error 404!

What I have tried:

the only thing I can do is to remove helmet from my app. and I can't find any solution for this.