Thank you! The problem is solved.

I've encountered this when a page has a lot of preloadable assets. This is usually done by the AddLinkHeadersForPreloadedAssets middleware, which sends asset URLs as Link response headers. It's great for performance because the browser can start loading assets even before receiving a response body, but if the response headers get too big, the combined size can exceed the FastCGI buffer size.

You can check the response headers of any working page. If you see any Link headers, this might be the issue. You can try increasing the buffer size. Add/modify these in the http context in nginx.conf and restart Nginx:

fastcgi_buffers 16 16k;
fastcgi_buffer_size 32k;

Hello everyone I am using Laravel with React (Inertia). I have deployed the application using nginx and it works fine, I can use it, login do some other actions and so on. But on any page other than / is giving me error. Example /admin/users if I come this page from other page (using navbar or something) It's working but once I refresh the page it's showing me 502

composer.json

{
    "$schema": "https://getcomposer.org/schema.json",
    "name": "laravel/react-starter-kit",
    "type": "project",
    "description": "The skeleton application for the Laravel framework.",
    "keywords": [
        "laravel",
        "framework"
    ],
    "license": "MIT",
    "require": {
        "php": "^8.2",
        "anthropic-ai/sdk": "^0.3.0",
        "google/cloud-document-ai": "^2.5",
        "inertiajs/inertia-laravel": "^2.0",
        "laravel/fortify": "^1.30",
        "laravel/framework": "^12.0",
        "laravel/sanctum": "^4.0",
        "laravel/tinker": "^2.10.1",
        "laravel/wayfinder": "^0.1.9",
        "nutgram/laravel": "^1.5",
        "phpoffice/phpword": "^1.4",
        "saloonphp/saloon": "^3.14"
    },
    "require-dev": {
        "fakerphp/faker": "^1.23",
        "laravel/boost": "^1.4",
        "laravel/pail": "^1.2.2",
        "laravel/pint": "^1.18",
        "laravel/sail": "^1.41",
        "mockery/mockery": "^1.6",
        "nunomaduro/collision": "^8.6",
        "pestphp/pest": "^4.1",
        "pestphp/pest-plugin-laravel": "^4.0"
    },
    "autoload": {
        "psr-4": {
            "App\\": "app/",
            "Database\\Factories\\": "database/factories/",
            "Database\\Seeders\\": "database/seeders/"
        },
        "files": [
            "app/Http/helpers.php"
        ]
    },
    "autoload-dev": {
        "psr-4": {
            "Tests\\": "tests/"
        }
    },
    "scripts": {
        "setup": [
            "composer install",
            "@php -r \"file_exists('.env') || copy('.env.example', '.env');\"",
            "@php artisan key:generate",
            "@php artisan migrate --force",
            "npm install",
            "npm run build"
        ],
        "dev": [
            "Composer\\Config::disableProcessTimeout",
            "npx concurrently -c \"#93c5fd,#c4b5fd,#fb7185,#fdba74\" \"php artisan serve\" \"php artisan queue:listen --tries=1\" \"php artisan pail --timeout=0\" \"npm run dev\" --names=server,queue,logs,vite --kill-others"
        ],
        "dev:ssr": [
            "npm run build:ssr",
            "Composer\\Config::disableProcessTimeout",
            "npx concurrently -c \"#93c5fd,#c4b5fd,#fb7185,#fdba74\" \"php artisan serve\" \"php artisan queue:listen --tries=1\" \"php artisan pail --timeout=0\" \"php artisan inertia:start-ssr\" --names=server,queue,logs,ssr --kill-others"
        ],
        "test": [
            "@php artisan config:clear --ansi",
            "@php artisan test"
        ],
        "post-autoload-dump": [
            "Illuminate\\Foundation\\ComposerScripts::postAutoloadDump",
            "@php artisan package:discover --ansi"
        ],
        "post-update-cmd": [
            "@php artisan vendor:publish --tag=laravel-assets --ansi --force"
        ],
        "post-root-package-install": [
            "@php -r \"file_exists('.env') || copy('.env.example', '.env');\""
        ],
        "post-create-project-cmd": [
            "@php artisan key:generate --ansi",
            "@php -r \"file_exists('database/database.sqlite') || touch('database/database.sqlite');\"",
            "@php artisan migrate --graceful --ansi"
        ],
        "pre-package-uninstall": [
            "Illuminate\\Foundation\\ComposerScripts::prePackageUninstall"
        ]
    },
    "extra": {
        "laravel": {
            "dont-discover": []
        }
    },
    "config": {
        "optimize-autoloader": true,
        "preferred-install": "dist",
        "sort-packages": true,
        "allow-plugins": {
            "pestphp/pest-plugin": true,
            "php-http/discovery": true
        }
    },
    "minimum-stability": "stable",
    "prefer-stable": true
}

package.json

{
    "private": true,
    "type": "module",
    "scripts": {
        "build": "vite build",
        "build:ssr": "vite build && vite build --ssr",
        "dev": "vite",
        "format": "prettier --write resources/",
        "format:check": "prettier --check resources/",
        "lint": "eslint . --fix",
        "types": "tsc --noEmit"
    },
    "devDependencies": {
        "@eslint/js": "^9.19.0",
        "@laravel/vite-plugin-wayfinder": "^0.1.7",
        "@types/node": "^22.13.5",
        "eslint": "^9.17.0",
        "eslint-config-prettier": "^10.0.1",
        "eslint-plugin-react": "^7.37.3",
        "eslint-plugin-react-hooks": "^5.1.0",
        "prettier": "^3.4.2",
        "prettier-plugin-organize-imports": "^4.1.0",
        "prettier-plugin-tailwindcss": "^0.6.11",
        "shadcn": "^3.4.2",
        "typescript-eslint": "^8.23.0"
    },
    "dependencies": {
        "@headlessui/react": "^2.2.0",
        "@inertiajs/react": "^2.1.4",
        "@radix-ui/react-alert-dialog": "^1.1.15",
        "@radix-ui/react-avatar": "^1.1.3",
        "@radix-ui/react-checkbox": "^1.1.4",
        "@radix-ui/react-collapsible": "^1.1.3",
        "@radix-ui/react-dialog": "^1.1.6",
        "@radix-ui/react-dropdown-menu": "^2.1.6",
        "@radix-ui/react-label": "^2.1.2",
        "@radix-ui/react-navigation-menu": "^1.2.5",
        "@radix-ui/react-radio-group": "^1.3.8",
        "@radix-ui/react-select": "^2.1.6",
        "@radix-ui/react-separator": "^1.1.2",
        "@radix-ui/react-slot": "^1.2.3",
        "@radix-ui/react-tabs": "^1.1.13",
        "@radix-ui/react-toggle": "^1.1.2",
        "@radix-ui/react-toggle-group": "^1.1.2",
        "@radix-ui/react-tooltip": "^1.1.8",
        "@tailwindcss/vite": "^4.1.11",
        "@types/react": "^19.0.3",
        "@types/react-dom": "^19.0.2",
        "@vitejs/plugin-react": "^4.6.0",
        "class-variance-authority": "^0.7.1",
        "clsx": "^2.1.1",
        "concurrently": "^9.0.1",
        "docx-preview": "^0.3.7",
        "framer-motion": "^12.23.24",
        "globals": "^15.14.0",
        "input-otp": "^1.4.2",
        "laravel-vite-plugin": "^2.0",
        "lucide-react": "^0.475.0",
        "react": "^19.0.0",
        "react-dom": "^19.0.0",
        "react-resizable-panels": "^3.0.6",
        "sonner": "^2.0.7",
        "tailwind-merge": "^3.0.1",
        "tailwindcss": "^4.0.0",
        "tailwindcss-animate": "^1.0.7",
        "typescript": "^5.7.2",
        "vite": "^7.0.4"
    },
    "optionalDependencies": {
        "@rollup/rollup-linux-x64-gnu": "4.9.5",
        "@tailwindcss/oxide-linux-x64-gnu": "^4.0.1",
        "lightningcss-linux-x64-gnu": "^1.29.1"
    }
}

nginx.conf

server {
    server_name my.domain.com;
    root /path/to/file;

    add_header X-Frame-Options "SAMEORIGIN";
    add_header X-Content-Type-Options "nosniff";

    index index.php;

    charset utf-8;

    location / {
        try_files $uri $uri/ /index.php?$query_string;
    }

    location = /favicon.ico { access_log off; log_not_found off; }
    location = /robots.txt  { access_log off; log_not_found off; }

    error_page 404 /index.php;

    location ~ ^/index\.php(/|$) {
        fastcgi_pass unix:/var/run/php/php8.3-fpm.sock;
        fastcgi_param SCRIPT_FILENAME $realpath_root$fastcgi_script_name;
        include fastcgi_params;
        fastcgi_hide_header X-Powered-By;
    }

    location ~ /\.(?!well-known).* {
        deny all;
    }
}

how can i fix it?