1. import java.io.IOException;
  2. import java.net.Socket;
  3. import java.net.SocketTimeoutException;
  4. import java.util.HashMap;
  5. import java.util.Map;
  7. public class HeaderStripper {
  9. public static Map<String, String> stripMetadataHeaders(String request) {
  10. Map<String, String> cleanedHeaders = new HashMap<>();
  12. if (request == null || request.isEmpty()) {
  13. return cleanedHeaders; // Handle null or empty request
  14. }
  16. String[] lines = request.split("\r\n"); // Split into lines
  18. for (String line : lines) {
  19. if (line.startsWith("Content-Type:")) {
  20. continue; // Skip Content-Type header
  21. }
  22. if (line.startsWith("Transfer-Encoding:")) {
  23. continue; // Skip Transfer-Encoding header
  24. }
  25. if (line.startsWith("Connection:")) {
  26. continue; // Skip Connection header
  27. }
  28. if (line.startsWith("Upgrade:")) {
  29. continue; // Skip Upgrade header
  30. }
  31. if (line.startsWith("Proxy-Connection:")) {
  32. continue; // Skip Proxy-Connection header
  33. }
  34. if (line.startsWith("Host:")) {
  35. continue; // Skip Host header
  36. }
  37. if (line.startsWith("Authorization:")) {
  38. continue; // Skip Authorization header
  39. }
  40. if (line.startsWith("Cookie:")) {
  41. continue; // Skip Cookie header
  42. }
  44. // Further filtering for metadata-related headers. Add more as needed.
  45. if (line.startsWith("X-Powered-By:")) {
  46. continue; // Skip X-Powered-By header
  47. }
  48. if (line.startsWith("Server:")) {
  49. continue; // Skip Server header
  50. }
  51. if (line.startsWith("Date:")) {
  52. continue; // Skip Date header
  53. }
  54. if(line.startsWith("Via:")) {
  55. continue; // Skip Via header
  56. }
  58. //If we reach here, it's a potentially useful header.
  59. String header = line.substring(0).trim();
  60. String value = "";
  61. if (line.contains(":") && line.indexOf(":") > 0) {
  62. value = line.substring(line.indexOf(":") + 1).trim();
  63. }
  64. if(!header.isEmpty()){
  65. cleanedHeaders.put(header, value);
  66. }
  70. }
  72. return cleanedHeaders;
  73. }
  75. public static void main(String[] args) throws IOException {
  76. String request = "GET / HTTP/1.1\r\n" +
  77. "Host: example.com\r\n" +
  78. "User-Agent: MyClient\r\n" +
  79. "X-Powered-By: PHP/7.4\r\n" +
  80. "Date: Tue, 26 Oct 2023 10:00:00 GMT\r\n" +
  81. "Server: Apache/2.4.41\r\n" +
  82. "Connection: close\r\n" +
  83. "Transfer-Encoding: chunked\r\n" +
  84. "Content-Type: application/json\r\n" +
  85. "Authorization: Bearer some_token\r\n" +
  86. "\r\n";
  88. Map<String, String> cleaned = stripMetadataHeaders(request);
  90. for (Map.Entry<String, String> entry : cleaned.entrySet()) {
  91. System.out.println(entry.getKey() + ": " + entry.getValue());
  92. }
  93. }
  94. }

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