'net::ERR_ABORTED 431 (Request Header Fields Too Large)

my problem on on site when im using npm start :

Mail_Sende:25          GET http://localhost:3000/mateu52/Mail_Sender/static/js/bundle.js/ net::ERR_ABORTED 431 (Request Header Fields Too Large)
localhost/:1          GET http://localhost:3000/mateu52/Mail_Sende/manifest.json/ 431 (Request Header Fields Too Large)
manifest.json:1 Manifest: Line: 1, column: 1, Syntax error.

my json :

"proxy": "http://localhost:3000/", "scripts": { "start": "react-scripts --max-http-header-size=12000 start", "test": "echo "Error: no test specified" && exit 1"

i created setupProxy.js and was OK. i tried change paramets in proxy->start, and change in html file:

<!-- <link rel="icon" href="%PUBLIC_URL%/favicon.ico" /> -->
    <link rel="shortcut icon" href="#">

day ago was ok i commited after serwerProxy.js created and cant loading app in React. and my path to localhost wa change i dont know how. after where localhost:8000 after + app/name_app

Solution 1:^[1]

i create new app and copied my components and is running.

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'net::ERR_ABORTED 431 (Request Header Fields Too Large)

Solution 1:[1]

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Solution 1:^[1]