1. import java.util.HashMap;
  2. import java.util.Map;
  3. import java.util.stream.Collectors;
  5. public class HeaderDeduplicator {
  7. public static Map<String, String> deduplicateHeaders(Map<String, String> headers) {
  8. Map<String, String> deduplicated = new HashMap<>();
  10. for (Map.Entry<String, String> entry : headers.entrySet()) {
  11. String key = entry.getKey();
  12. String value = entry.getValue();
  14. if (value != null && !value.trim().isEmpty()) { // Sanity check: value not null or empty
  15. if (!deduplicated.containsKey(key)) {
  16. deduplicated.put(key, value);
  17. }
  18. }
  19. }
  21. return deduplicated;
  22. }
  24. public static void main(String[] args) {
  25. // Example usage
  26. Map<String, String> headers = new HashMap<>();
  27. headers.put("Content-Type", "application/json");
  28. headers.put("Content-Type", "application/json"); // Duplicate
  29. headers.put("X-Custom-Header", "value1");
  30. headers.put("X-Custom-Header", "value2"); // Duplicate
  31. headers.put("Status", "200 OK");
  32. headers.put(" ", ""); //Empty string
  33. headers.put(null, null); //Null value
  36. Map<String, String> deduplicatedHeaders = deduplicateHeaders(headers);
  38. // Print the deduplicated headers
  39. deduplicatedHeaders.forEach((key, value) -> System.out.println(key + ": " + value));
  40. }
  41. }

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