Interface FetchHandlerOptions

Optional CORS configuration for createFetchHandler. Omit it entirely to keep same-origin behaviour (no CORS headers, OPTIONS → 405).

interface FetchHandlerOptions {
allowedOrigin?: string | string[];
}

Properties

allowedOrigin?: string | string[]

Browser origin(s) permitted to call this relay cross-origin.

'*' allows any origin (echoes *).
A single origin string or an array of origins: the request's Origin is echoed back only when it matches; otherwise no Access-Control-Allow-Origin is emitted (browser blocks the response).
Omitted: no CORS headers at all, and OPTIONS returns 405 (same as before).