# Fix: Failed to fetch di Localhost

## Masalah

Error: "Failed to fetch" saat mengakses `http://localhost:8080/`

Backend API error:
```
[404]: OPTIONS /auth/v1/login - No such file or directory
```

## Penyebab

PHP built-in server dijalankan **TANPA router.php**, sehingga routing tidak bekerja.

## Solusi

### 1. Jalankan Backend API dengan Router

**SALAH** (yang menyebabkan error):
```bash
cd api-btekno
php -S localhost:8000
```

**BENAR** (yang harus dilakukan):
```bash
cd api-btekno/public
php -S localhost:8000 router.php
```

File `router.php` diperlukan untuk handle routing seperti `/auth/v1/login`.

### 2. Jalankan Frontend

```bash
cd "retribusi (frontend)/public"
php -S localhost:8080
```

### 3. Test Backend API

Buka browser dan akses:
```
http://localhost:8000/health
```

Harusnya return: `{"status":"ok","time":...}`

Jika masih 404, berarti router.php tidak bekerja.

### 4. Cek Config Frontend

File `public/dashboard/js/config.js` harus return:
```javascript
return 'http://localhost:8000';
```

## Quick Start Script

Buat file `start-local.bat` di root project:

```batch
@echo off
echo Starting Backend API...
start "Backend API" cmd /k "cd api-btekno\public && php -S localhost:8000 router.php"

timeout /t 2

echo Starting Frontend...
start "Frontend" cmd /k "cd retribusi (frontend)\public && php -S localhost:8080"

echo.
echo Backend API: http://localhost:8000
echo Frontend: http://localhost:8080
echo.
pause
```

Jalankan `start-local.bat` untuk start kedua server sekaligus.

## Troubleshooting

### Masih 404 di Backend?

1. Pastikan menjalankan dari folder `api-btekno/public`
2. Pastikan menggunakan `router.php`: `php -S localhost:8000 router.php`
3. Cek file `router.php` ada di `api-btekno/public/router.php`

### Masih "Failed to fetch"?

1. Buka browser console (F12)
2. Cek log `[API] Request:` - pastikan URL benar
3. Test backend langsung: `curl http://localhost:8000/health`
4. Cek CORS - pastikan backend allow origin `http://localhost:8080`

### CORS Error?

Backend sudah ada CORS middleware, tapi pastikan:
1. Backend running dengan router.php
2. CORS middleware sudah di-register di `public/index.php`