I want someone fix a bug that socket io client and socket io server

I have an chatapp with socket io and react js and express js and when i trying to send a message from the react js(frontend) it doesn't want to send message to soxket io server

This problem happens only when i host website on vps server with nginx but when i run the website on my computer it works perfectly

MY MAX BUDGET IS 10$, IT IS VERY EASY TO FIX IT