Tracing HTTP Redirects

Example to trace through HTTP redirects.

Download Chilkat .NET for 2.0 / 3.5 Framework

Download Chilkat .NET for 1.0 / 1.1 Framework

Chilkat.Http http = new Chilkat.Http();

bool success;

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

string url;
string html;
int status;

url = "http://www.planyourweddingonline.co.za/";

//  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.FollowRedirects = false;

//  Send the HTTP GET and return the content in a string.
html = http.QuickGetStr(url);
if (html == null ) {
    MessageBox.Show(http.LastErrorText);
}

status = http.LastStatus;
textBox1.Text += "HTTP Response Status: " + Convert.ToString(status) + "\r\n";

//  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.
textBox1.Text += "Redirect URL: " + http.FinalRedirectUrl + "\r\n";

int loopCount;
loopCount = 0;

while ((status == 302)) {
    url = http.FinalRedirectUrl;
    html = http.QuickGetStr(url);
    if (html == null ) {
        MessageBox.Show(http.LastErrorText);
        break;
    }

    status = http.LastStatus;
    textBox1.Text += "Redirect URL: " + http.FinalRedirectUrl + "\r\n";

    //  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;
    }

}