HTTPS Form Login

Using the del.icio.us site, demonstrates how to programmatically login via a form.

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Chilkat.HttpRequest req = new Chilkat.HttpRequest();
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;
}

//  Cookies may be persisted to a directory in the filesystem,
//  or alternatively cached in memory by using the "memory"
//  keyword:
http.CookieDir = "memory";
//  Accumulated cookies are sent with each GET/POST:
http.SaveCookies = true;
//  Cookies received in HTTP responses are to be saved:
http.SendCookies = true;

//  Get the page with the login form.  We're only doing this
//  just in case there are cookies that need to be cached
//  and re-sent in the next step:
string html;
html = http.QuickGetStr("https://secure.del.icio.us/login");
if (http.LastStatus != 200) {
    MessageBox.Show(http.LastErrorText);
    return;
}

//  Examining the "Page Info" in FireFox reveals a form with
//  a target of https://secure.del.icio.us/login with
//  fields of "user_name", "password", and "login".  The "login"
//  field is nothing more than the submit button and holds
//  the value "log in".

//  Build an HTTP POST Request:
req.UsePost();
req.Path = "/login";
req.AddParam("user_name","chilkatsoft");
req.AddParam("password","****");
req.AddParam("login","log in");

//  Send the HTTP POST and get the response.  Note: This is a blocking call.
//  The method does not return until the full HTTP response is received.
string domain;
int port;
bool ssl;
domain = "secure.del.icio.us";
port = 443;
ssl = true;
Chilkat.HttpResponse resp = null;
resp = http.SynchronousRequest(domain,port,ssl,req);
if (resp == null ) {
    textBox1.Text += http.LastErrorText + "\r\n";
    textBox1.Refresh();
}
else {
    int responseStatus;
    responseStatus = resp.StatusCode;
    if (responseStatus == 302) {

        //  We have a redirect.  Follow it...
        //  Note: the FollowRedirects property causes
        //  301/302 responses to GET requests to be
        //  automatically followed.
        http.FollowRedirects = true;
        html = http.QuickGetStr(resp.GetHeaderField("Location"));
        if (http.LastStatus != 200) {
            MessageBox.Show(http.LastErrorText);
            return;
        }

    }
    else {
        html = resp.BodyStr;
    }

    textBox1.Text += Convert.ToString(responseStatus) + "\r\n";
    textBox1.Refresh();

    //  Display the HTML source of the page returned.
    textBox1.Text += html + "\r\n";
    textBox1.Refresh();

}