Tracing HTTP Redirects

Example to trace through HTTP redirects.

Download Chilkat Java Library

import com.chilkatsoft.*;

public class ChilkatExample {

  static {
    try {
        System.loadLibrary("chilkat");
    } catch (UnsatisfiedLinkError e) {
      System.err.println("Native code library failed to load.\n" + e);
      System.exit(1);
    }
  }

  public static void main(String argv[])
  {
    CkHttp http = new CkHttp();

    boolean success;

    //  Any string unlocks the component for the 1st 30-days.
    success = http.UnlockComponent("Anything for 30-day trial");
    if (success != true) {
        System.out.println(http.lastErrorText());
        return;
    }

    String url;
    String html;
    int status;

    url = "http://www.kqzyfj.com/";

    //  The FollowRedirects property controls whether redirects
    //  are automatically followed.  The default behavior is to
    //  automatically follow redirects.

    //  Explicitly set FollowRedirects so that redirects are NOT automatically taken:
    http.put_FollowRedirects(false);

    //  Send the HTTP GET and return the content in a string.
    html = http.quickGetStr(url);
    if (html == null ) {
        System.out.println(http.lastErrorText());
    }

    status = http.get_LastStatus();
    System.out.println("HTTP Response Status: "
         + status);

    //  The FinalRedirectUrl property will contain the redirect URL
    //  If FollowRedirects was equal to true, then all of the
    //  intermediate redirects (if any) would be followed until
    //  there were no more redirects.  However, because
    //  FollowRedirects is not true, FinalRedirectUrl contains
    //  the next redirect URL.
    System.out.println("Redirect URL: " + http.finalRedirectUrl());

    int loopCount;
    loopCount = 0;

    while ((status == 302)) {
        url = http.finalRedirectUrl();
        html = http.quickGetStr(url);
        if (html == null ) {
            System.out.println(http.lastErrorText());
            break;
        }

        status = http.get_LastStatus();
        System.out.println("Redirect URL: " + http.finalRedirectUrl());

        //  You may wish to check that if FinalRedirectUrl
        //  equals the URL just retrieved.  If so, then break out of the
        //  loop.  (This check is omitted in this example.)

        //  Instead, this example will prevent infinite loops by
        //  keeping a loopCount and only allows following a max
        //  of 10 redirects:
        loopCount = loopCount + 1;
        if (loopCount > 10) {
            break;
        }

    }

  }
}