/**
 * Merge HTTP header maps case-insensitively, preserving latest key casing.
 */
export declare function mergeHeaderMaps(base?: Record<string, string>, override?: Record<string, string>): Record<string, string> | undefined;
/**
 * Set a header while treating header names as case-insensitive.
 */
export declare function setHeaderCaseInsensitive(headers: Record<string, string>, name: string, value: string): void;
//# sourceMappingURL=http-headers.d.ts.map