'Heroku MERN stack proxy issue

I'll keep it short. I published my MERN stack project that I created before on heroku. There was no problem, but when I run localhost, I can get a response with a proxy between the backend and the front-end.But it doesn't work on heroku, what should I do? can you help me?

heroku mern

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'Heroku MERN stack proxy issue

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