request failed with status code 404

[Code-dogcreatior]

I start backend with (iopaint start --host 0.0.0.0 --port 8099) and the frontend(npm run dev),it works fine.However,when I run (npm run build) ,the frontend shows "request failed with status code 404".

vite.config.ts:
import path from "path"
import react from "@vitejs/plugin-react"
import { defineConfig, loadEnv } from "vite"

export default defineConfig(({ mode }) => {
const env = loadEnv(mode, process.cwd(), '')

return {
base: '/',
plugins: [react()],
resolve: {
alias: {
"@": path.resolve(__dirname, "./src"),
}
}
}
})

.env.local
VITE_BACKEND=http://localhost:8099

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[github-actions]

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