Delphi ActiveX

Http Follow Redirects

See more HTTP Examples

Demonstrates how to automatically follow redirects. Delphi ActiveX

uses
    Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics,
    Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.StdCtrls, Chilkat_TLB;

...

procedure TForm1.Button1Click(Sender: TObject);
var
http: TChilkatHttp;
url: WideString;
jsonResponse: WideString;

begin
http := TChilkatHttp.Create(Self);

// If you would like to see the HTTP session log to see how 
// HTTP redirects were followed.
http.SessionLogFilename := 'c:/temp/qa_output/sessionLog.txt';

// Run the test using this URL.
// (Works while httpbin.org keeps the test endpoint available.)

url := 'https://httpbin.org/redirect-to?url={$redirectUrl}&status_code={$statusCode}';

http.SetUrlVar('redirectUrl','https://chilkatsoft.com/helloWorld.json');
http.SetUrlVar('statusCode','302');

jsonResponse := http.QuickGetStr(url);
if (http.LastMethodSuccess = 0) then
  begin
    Memo1.Lines.Add(http.LastErrorText);
    Exit;
  end;

Memo1.Lines.Add('Response status code: ' + IntToStr(http.LastStatus));
Memo1.Lines.Add(jsonResponse);

// How to tell if the request was redirected, and if so,
// what was the final redirect URL?
Memo1.Lines.Add('Was Redirected: ' + IntToStr(Ord(http.WasRedirected)));
Memo1.Lines.Add('Final Redirect URL: ' + http.FinalRedirectUrl);

// Output:

// Response status code: 200
// { "hello": "world" }
// Was Redirected: True
// Final Redirect URL: https://chilkatsoft.com/helloWorld.json

// -----------------------------------------------
// Here are the contents of the sessionLog.txt

// ---- Sending Sat, 30 Aug 2025 11:41:37 GMT ----
// GET /redirect-to?url=https%3A%2F%2Fchilkatsoft.com%2FhelloWorld.json&status_code=302 HTTP/1.1
// Host: httpbin.org
// Accept: */*
// Accept-Encoding: gzip
// 
// 
// ---- Received Sat, 30 Aug 2025 11:41:37 GMT ----
// HTTP/1.1 302 FOUND
// Date: Sat, 30 Aug 2025 11:41:38 GMT
// Content-Type: text/html; charset=utf-8
// Content-Length: 0
// Connection: keep-alive
// Server: gunicorn/19.9.0
// Location: https://chilkatsoft.com/helloWorld.json
// Access-Control-Allow-Origin: *
// Access-Control-Allow-Credentials: true
// 
// 
// ---- Sending Sat, 30 Aug 2025 11:41:38 GMT ----
// GET /helloWorld.json HTTP/1.1
// Host: chilkatsoft.com
// Accept: */*
// Accept-Encoding: gzip
// 
// 
// ---- Received Sat, 30 Aug 2025 11:41:38 GMT ----
// HTTP/1.1 200 OK
// Content-Type: application/json
// Last-Modified: Sun, 20 Aug 2023 11:36:27 GMT
// Accept-Ranges: bytes
// ETag: "34c27f8e5ad3d91:0"
// Server: Microsoft-IIS/10.0
// X-Powered-By: ASP.NET
// Date: Sat, 30 Aug 2025 11:41:38 GMT
// Content-Length: 22
// 
// { "hello": "world" }
end;