/**
 * HTTP utilities for URL validation and request handling.
 *
 * Provides security-focused validation for URLs and HTTP operations.
 */
/**
 * Validate and normalize a base URL.
 * Only allows http: and https: protocols to prevent SSRF attacks.
 *
 * @param url - URL string to validate
 * @returns Validated URL object
 * @throws Error if URL is invalid or uses unsupported protocol
 *
 * @example
 * validateBaseUrl('https://api.example.com') // URL object
 * validateBaseUrl('http://localhost:3000') // URL object
 * validateBaseUrl('file:///etc/passwd') // throws Error
 * validateBaseUrl('javascript:alert(1)') // throws Error
 */
export declare function validateBaseUrl(url: string): URL;