Function getServerOrigin

packages/vite/hmr/server/websocket.ts:5488–5528

* Get server origin for URLs

(server: ViteDevServer)

 * Get server origin for URLs
 */
function getServerOrigin(server: ViteDevServer): string {
	const urls: any = (server as any).resolvedUrls;
	// Prefer a real LAN/network URL when available so emulators/devices can reach the host directly.
	if (urls?.network?.length) {
		try {
			const u = new URL(String(urls.network[0]));
			const origin = `${u.protocol}//${u.host}`;
			if (!/^https?:\/\/[\w\-.:\[\]]+$/.test(origin)) {
				console.warn('[hmr][origin] invariant failed for resolvedUrls.network:', urls.network[0], '→', origin);
			}
			return origin;
		} catch {
			// Fallthrough to local below if network parse fails
		}
	}
	if (urls?.local?.length) {
		try {
			const u = new URL(String(urls.local[0]));
			const origin = `${u.protocol}//${u.host}`;
			if (!/^https?:\/\/[\w\-.:\[\]]+$/.test(origin)) {
				console.warn('[hmr][origin] invariant failed for resolvedUrls.local:', urls.local[0], '→', origin);
			}
			return origin;
		} catch {
			// Fallthrough to manual construction
		}
	}

	const isHttps = !!server.config.server?.https;
	const httpServer = server.httpServer as any;
	const addr = httpServer?.address?.();
	const port = Number(server.config.server?.port || addr?.port || 5173);
	const hostCfg = server.config.server?.host;
	const host = typeof hostCfg === 'string' && hostCfg !== '0.0.0.0' ? hostCfg : '127.0.0.1';

	const origin = `${isHttps ? 'https' : 'http'}://${host}:${port}`;
	if (!/^https?:\/\/[\w\-.:\[\]]+$/.test(origin)) {
		console.warn('[hmr][origin] invariant failed for constructed origin:', origin);
	}
	return origin;
}

// Test-only export: allow unit tests to run the sanitizer on snippets without booting a server
// Safe in production builds; this is a named export that tests can import explicitly.