import type { Request } from 'express-serve-static-core';
/**
 * Since there can be multiple of certain HTTP headers or
 * to prevent ugliness if someone did send us multiple
 * instances of a header we only expect one of, this
 * method grabs the 1st/only one of the desired header
 * @param header The header to find
 * @param req The received HTTP request (with headers)
 * @returns The first or only occurrence of the specified HTTP header
 */
export declare const getHttpHeader: (header: string, req: Request) => string | undefined;
//# sourceMappingURL=getHttpHeader.d.ts.map