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Update frontend README runtime API config

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anntr1k3
2026-07-03 22:43:45 +04:00
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frontend/README.md
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# ShadowBroker Frontend
Next.js 16 dashboard with MapLibre GL, Cesium, and Framer Motion.
Next.js 16 dashboard with MapLibre GL and Framer Motion.
## Development
@@ -11,41 +11,39 @@ npm run dev # http://localhost:3000
## API URL Configuration
The frontend needs to reach the backend (default port `8000`). Resolution order:
The browser calls relative `/api/*` paths. The catch-all route handler at
`src/app/api/[...path]/route.ts` proxies those requests to the backend using
the server-side `BACKEND_URL` environment variable at request time.
1. **`NEXT_PUBLIC_API_URL`** env var — if set, used as-is (build-time, baked by Next.js)
2. **Server-side (SSR)** — falls back to `http://localhost:8000`
3. **Client-side (browser)** — auto-detects using `window.location.hostname:8000`
This keeps the backend URL out of the client bundle and lets Docker or other
deployments change the backend target without rebuilding the frontend.
### Common scenarios
### Common Scenarios
| Scenario | Action needed |
| ----------------------------------------------- | --------------------------------------------------------------- |
| Local dev (`localhost:3000` + `localhost:8000`) | None — auto-detected |
| LAN access (`192.168.x.x:3000`) | None — auto-detected from browser hostname |
| Public deploy (same host, port 8000) | None — auto-detected |
| Backend on different port (e.g. `9096`) | Set `NEXT_PUBLIC_API_URL=http://host:9096` before build |
| Backend on different host | Set `NEXT_PUBLIC_API_URL=http://backend-host:8000` before build |
| Behind reverse proxy (e.g. `/api` path) | Set `NEXT_PUBLIC_API_URL=https://yourdomain.com` before build |
| Scenario | Action needed |
| --- | --- |
| Local dev (`localhost:3000` + backend on `127.0.0.1:8000`) | None. The proxy defaults to `http://127.0.0.1:8000`. |
| Docker Compose | None. `docker-compose.yml` sets `BACKEND_URL=http://backend:8000`. |
| Backend on a different host or port | Set `BACKEND_URL` before starting the Next.js server/container. |
| Reverse proxy in front of the frontend | Point external clients at the frontend; keep `BACKEND_URL` set to the backend address reachable from the Next.js server. |
### Setting the variable
### Setting `BACKEND_URL`
```bash
# Shell (Linux/macOS)
NEXT_PUBLIC_API_URL=http://myserver:8000 npm run build
BACKEND_URL=http://myserver:8000 npm run dev
# PowerShell (Windows)
$env:NEXT_PUBLIC_API_URL="http://myserver:8000"; npm run build
$env:BACKEND_URL="http://myserver:8000"; npm run dev
# Docker Compose (set in .env file next to docker-compose.yml)
NEXT_PUBLIC_API_URL=http://myserver:8000
# Docker Compose
# Edit the frontend service environment or add a compose override:
# BACKEND_URL=http://myserver:8000
```
> **Note:** This is a build-time variable. Changing it requires rebuilding the frontend.
## Theming
Dark mode is the default. A light/dark toggle is available in the left panel toolbar.
Theme preference is persisted in `localStorage` as `sb-theme` and applied via
`data-theme` attribute on `<html>`. CSS variables in `globals.css` define all
structural colors for both themes.
Dark mode is the default. A light/dark toggle is available in the left panel
toolbar. Theme preference is persisted in `localStorage` as `sb-theme` and
applied via the `data-theme` attribute on `<html>`. CSS variables in
`globals.css` define all structural colors for both themes.