Function deriveHttpOrigin

packages/vite/hmr/client/utils.ts:144–163

(wsUrl: string | undefined)

export const moduleFetchCache = new Map<string, string>(); // spec -> resolved HTTP URL

export function deriveHttpOrigin(wsUrl: string | undefined) {
	try {
		// Prefer explicit HTTP origin provided by entry-runtime when available
		try {
			const g: any = globalThis as any;
			if (g && typeof g.__NS_HTTP_ORIGIN__ === 'string' && /^https?:\/\//.test(g.__NS_HTTP_ORIGIN__)) {
				return String(g.__NS_HTTP_ORIGIN__);
			}
		} catch {}
		const url = new URL(wsUrl || 'ws://localhost:5173/ns-hmr');
		const http = url.protocol === 'wss:' ? 'https:' : 'http:';
		const origin = `${http}//${url.host}`;
		if (!/^https?:\/\/[\w\-.:\[\]]+$/.test(origin)) {
			console.warn('[hmr-client][origin] invariant failed for', wsUrl, '→', origin);
		}
		return origin;
	} catch {
		return 'http://localhost:5173';
	}
}

export async function requestModuleFromServer(spec: string): Promise<string> {
	const isSfcArtifact = (s: string) => /(?:^|\/)sfc-[a-f0-9]{8}\.mjs$/i.test(s) || /\/_ns_hmr\/src\/sfc\//.test(s) || /__NSDOC__\/_ns_hmr\/src\/sfc\//.test(s);