1. /**
  2. * Caches headers metadata for routine automation with input validation.
  3. * @param {string} url The URL to fetch headers from.
  4. * @param {object} options Optional fetch options.
  5. * @returns {Promise<object>} A promise that resolves to the cached headers metadata or rejects on error.
  6. */
  7. async function getCachedHeaders(url, options = {}) {
  8. const cacheKey = url; // Use URL as cache key
  10. // Check if headers are already cached
  11. if (typeof cachedHeaders[cacheKey] !== 'undefined') {
  12. console.log(`Retrieving headers from cache for ${url}`);
  13. return cachedHeaders[cacheKey];
  14. }
  16. try {
  17. const response = await fetch(url, options);
  19. if (!response.ok) {
  20. throw new Error(`HTTP error! Status: ${response.status}`);
  21. }
  23. const headers = await response.headers.getHeaders();
  25. // Basic input validation - check if headers is an object
  26. if (typeof headers !== 'object' || headers === null) {
  27. throw new Error(`Invalid headers format for ${url}`);
  28. }
  30. cachedHeaders[cacheKey] = headers; // Store headers in cache
  31. console.log(`Cached headers for ${url}`);
  32. return headers;
  34. } catch (error) {
  35. console.error(`Error fetching headers for ${url}:`, error);
  36. throw error; // Re-throw the error to be handled by the caller
  37. }
  38. }
  40. // Initialize the cache
  41. const cachedHeaders = {};
  43. // Example usage (for testing - remove in production)
  44. // async function example() {
  45. // try {
  46. // const headers = await getCachedHeaders('https://example.com');
  47. // console.log(headers);
  48. // } catch (error) {
  49. // console.error(error);
  50. // }
  51. // }
  53. // example();

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