Delphi DLL

HTTP GET with Non-USASCII Query Params

See more HTTP Examples

This example illustrates how query parameters in a URL are typically encoded and transmitted. Delphi DLL

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

...

procedure TForm1.Button1Click(Sender: TObject);
var
success: Boolean;
sbCompanyName: HCkStringBuilder;
sbUrl: HCkStringBuilder;
http: HCkHttp;
sbResponse: HCkStringBuilder;

begin
success := False;

// This example assumes the Chilkat HTTP API to have been previously unlocked.
// See Global Unlock Sample for sample code.

// First, let's load the string "Grünhöfer GmbH" from a file.  (This is a fictitious company name.)
// The file uses the utf-8 charset encoding.
sbCompanyName := CkStringBuilder_Create();
success := CkStringBuilder_LoadFile(sbCompanyName,'qa_data/txt/companyName.txt','utf-8');
// Assuming success for this example...

// We'll send an HTTP GET request to https://chilkatsoft.com/example?company_name={company name}

// When sending an HTTP GET request with query parameters that contain accented characters 
// (e.g., umlauts: ä, ö, ü), they must be percent-encoded (URL encoded) to ensure proper transmission and 
// interpretation by the server.  This is based on their UTF-8 byte values.
sbUrl := CkStringBuilder_Create();
CkStringBuilder_Append(sbUrl,'https://chilkatsoft.com/example?company_name=');
CkStringBuilder_Append(sbUrl,CkStringBuilder__getEncoded(sbCompanyName,'url','utf-8'));

http := CkHttp_Create();

// Send the following HTTP GET request:

// GET /example?company_name=Gr%C3%BCnh%C3%B6fer%20GmbH HTTP/1.1
// Host: chilkatsoft.com
// Accept: */*
// Accept-Encoding: gzip

sbResponse := CkStringBuilder_Create();
success := CkHttp_QuickGetSb(http,CkStringBuilder__getAsString(sbUrl),sbResponse);
if (success = False) then
  begin
    Memo1.Lines.Add(CkHttp__lastErrorText(http));
    Exit;
  end;

Memo1.Lines.Add('response status code: ' + IntToStr(CkHttp_getLastStatus(http)));
Memo1.Lines.Add(CkStringBuilder__getAsString(sbResponse));

CkStringBuilder_Dispose(sbCompanyName);
CkStringBuilder_Dispose(sbUrl);
CkHttp_Dispose(http);
CkStringBuilder_Dispose(sbResponse);

end;