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(Delphi DLL) Manually Follow HTTP RedirectsDemonstrates how to manually follow redirects for an HTTP GET. Note: This example requires Chilkat v11.0.0 or greater.
uses Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics, Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.StdCtrls, HttpResponse, Http; ... procedure TForm1.Button1Click(Sender: TObject); var success: Boolean; http: HCkHttp; resp: HCkHttpResponse; status: Integer; loopCount: Integer; nextUrl: PWideChar; begin success := False; // This example requires the Chilkat API to have been previously unlocked. // See Global Unlock Sample for sample code. http := CkHttp_Create(); // 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: CkHttp_putFollowRedirects(http,False); resp := CkHttpResponse_Create(); success := CkHttp_HttpNoBody(http,'GET','http://yandex.ru/',resp); if (success = False) then begin Memo1.Lines.Add(CkHttp__lastErrorText(http)); Exit; end; status := CkHttpResponse_getStatusCode(resp); Memo1.Lines.Add('HTTP Response Status: ' + IntToStr(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. loopCount := 0; while (status = 302) do begin Memo1.Lines.Add('Redirect URL: ' + CkHttp__finalRedirectUrl(http)); nextUrl := CkHttp__finalRedirectUrl(http); success := CkHttp_HttpNoBody(http,'GET',nextUrl,resp); if (success = False) then begin Memo1.Lines.Add(CkHttp__lastErrorText(http)); Exit; end; status := CkHttpResponse_getStatusCode(resp); Memo1.Lines.Add('HTTP Response Status: ' + IntToStr(status)); // For safety, prevent infinite loops by // keeping a loopCount and only allows following a max // of 10 redirects: loopCount := loopCount + 1; if (loopCount > 10) then begin Memo1.Lines.Add('Too many redirects.'); Exit; end; end; CkHttp_Dispose(http); CkHttpResponse_Dispose(resp); end; |
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