1. <?php
  3. /**
  4. * Loads response headers for backward compatibility with retry logic.
  5. *
  6. * This function retrieves specific response headers (e.g., 'Retry-After', 'Cache-Control')
  7. * and parses them to provide information useful for retry attempts. It offers
  8. * backward compatibility by handling cases where certain headers might be missing.
  9. *
  10. * @param Psr7\ClientInterface|null $client The HTTP client. Defaults to null (using default client).
  11. * @return array An associative array of response headers. Returns an empty array on failure.
  12. */
  13. function getRetryHeaders(Psr7\ClientInterface|null $client = null): array
  14. {
  15. $headers = [];
  17. if ($client === null) {
  18. // Use default client if not provided.
  19. $client = $this->getClient(); // Assuming getClient() is defined elsewhere and returns a Psr7\ClientInterface
  20. }
  22. try {
  23. $response = $client->get('/'); // Replace '/' with the actual URL.
  24. $headers = $response->getHeaders();
  25. } catch (\Exception $e) {
  26. // Handle exceptions during request. Return empty array on error.
  27. error_log("Error getting response headers: " . $e->getMessage());
  28. return [];
  29. }
  32. // Extract Retry-After header.
  33. $retryAfter = $headers['Retry-After'] ?? null;
  34. if ($retryAfter !== null && is_numeric($retryAfter)) {
  35. $headers['retry_after'] = (int)$retryAfter; // Cast to integer
  36. }
  38. // Extract Cache-Control header.
  39. $cacheControl = $headers['Cache-Control'] ?? '';
  40. if (!empty($cacheControl)) {
  41. //Further parsing of Cache-Control might be needed, but example is just to get the value.
  42. $headers['cache_control'] = $cacheControl;
  43. }
  45. // Extract other relevant headers (e.g., Max-Retry) - Add more headers as needed.
  46. $maxRetry = $headers['Max-Retry'] ?? null;
  47. if ($maxRetry !== null && is_numeric($maxRetry)) {
  48. $headers['max_retry'] = (int)$maxRetry;
  49. }
  52. return $headers;
  53. }
  55. /**
  56. * Placeholder for getting the client. Must be defined elsewhere.
  57. * @return Psr7\ClientInterface
  58. */
  59. function getClient(): Psr7\ClientInterface
  60. {
  61. // Replace with your actual client retrieval logic.
  62. // This is just a placeholder.
  63. return new \GuzzleHttp\Client();
  64. }
  67. ?>

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