Java API Tutorial - Java URLConnection .getHeaderFieldKey (int n)

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Syntax

URLConnection.getHeaderFieldKey(int n) has the following syntax.

public String getHeaderFieldKey(int n)

Example

In the following code shows how to use URLConnection.getHeaderFieldKey(int n) method.

import java.net.URL;
import java.net.URLConnection;
/*from  w ww.  j a  va2 s  .com*/
public class Main {
  public static void main(String[] argv) throws Exception {
    URL url = new URL("http://java2s.com");
    URLConnection conn = url.openConnection();

    for (int i = 0;; i++) {
      String headerName = conn.getHeaderFieldKey(i);
      String headerValue = conn.getHeaderField(i);
      System.out.println(headerName);
      System.out.println(headerValue);

      if (headerName == null && headerValue == null) {
        System.out.println("No more headers");
        break;
      }
    }
  }
}

The code above generates the following result.

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