Proxy issue on React app connecting heroku server

Hi Netlify team. I came across one problem after deployment. Problem is proxy not working after deploying my React app in netlify. I am using api deployed in heroku. []

I am using React v17 currently, and I did proxy from localhost with createProxyMiddleware. I had tried something with __redirect in the build public folder

/api/v1/* 200
/* /index.html 200

But it does not work.

To get response my api endpoint is like this [].
So what is wrong with my code? In my browser, api request are bad.
My deployed site is

Hi @EuJin03,

What do you mean by API request are bad? I’m getting a 404, is that what you’re talking about?