export declare function isAllowedProxyTarget(raw: string): boolean;
export declare function forwardProxyRequest(input: {
    target: string;
    method: string;
    headers: Record<string, string>;
    body?: Buffer | string | undefined;
}): Promise<{
    status: number;
    headers: Record<string, string>;
    body: Buffer;
}>;
export declare const CORS_PREFLIGHT_HEADERS: {
    readonly 'access-control-allow-origin': "*";
    readonly 'access-control-allow-headers': "*";
    readonly 'access-control-allow-methods': "GET,POST,PUT,PATCH,DELETE,OPTIONS";
};