Delphi DLL

URL Encoding Charset in POST Query Params

See more HTTP Examples

Demonstrates how to control the URL encoding charset in POST query params. 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, HttpResponse, HttpRequest;

...

procedure TForm1.Button1Click(Sender: TObject);
var
success: Boolean;
nameWin1252Encoded: PWideChar;
sb: HCkStringBuilder;
http: HCkHttp;
req: HCkHttpRequest;
resp: HCkHttpResponse;

begin
success := False;

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

// We have the string "MÆRSK".
nameWin1252Encoded := 'M%E6RSK';

sb := CkStringBuilder_Create();
success := CkStringBuilder_DecodeAndAppend(sb,nameWin1252Encoded,'url','windows-1252');

http := CkHttp_Create();

// We're setting the session log filename so we can see the exact request sent.
CkHttp_putSessionLogFilename(http,'qa_output/sessionLog.txt');

// First demonstrate a simple application/x-www-form-urlencoded POST

req := CkHttpRequest_Create();

// Set the Charset = "utf-8" to cause URL encoding to use utf-8.
CkHttpRequest_putCharset(req,'utf-8');

CkHttpRequest_AddParam(req,'name',CkStringBuilder__getAsString(sb));

CkHttpRequest_putHttpVerb(req,'POST');
CkHttpRequest_putContentType(req,'application/x-www-form-urlencoded');

resp := CkHttpResponse_Create();
success := CkHttp_HttpReq(http,'https://www.chilkatsoft.com/something',req,resp);
if (success = False) then
  begin
    Memo1.Lines.Add(CkHttp__lastErrorText(http));
    Exit;
  end;

// This is the request that is sent:
// Notice that utf-8 is used in the query param (the letter 'Æ' is %C3%A6)

// 	POST /something HTTP/1.1
// 	Host: www.chilkatsoft.com
// 	Content-Type: application/x-www-form-urlencoded
// 	Content-Length: 15
// 
// 	name=M%C3%A6RSK

// ---------------------------------------------------------------
// Switch to windows-1252

CkHttpRequest_putCharset(req,'windows-1252');
CkHttpRequest_putHttpVerb(req,'POST');
CkHttpRequest_putContentType(req,'application/x-www-form-urlencoded');

success := CkHttp_HttpReq(http,'https://www.chilkatsoft.com/something',req,resp);
if (success = False) then
  begin
    Memo1.Lines.Add(CkHttp__lastErrorText(http));
    Exit;
  end;

// This is the request that is sent:
// Notice that windows-1252 is used in the query param (the letter 'Æ' is %E6)

// 	POST /something HTTP/1.1
// 	Host: www.chilkatsoft.com
// 	Content-Type: application/x-www-form-urlencoded
// 	Content-Length: 12
// 
// 	name=M%E6RSK

// ---------------------------------------------------------------
// Let's do the same with HttpSReq, switching back to utf-8

CkHttpRequest_putPath(req,'/something');
CkHttpRequest_putHttpVerb(req,'POST');
CkHttpRequest_putContentType(req,'application/x-www-form-urlencoded');

CkHttpRequest_putCharset(req,'utf-8');
success := CkHttp_HttpSReq(http,'www.chilkatsoft.com',443,True,req,resp);
if (success = False) then
  begin
    Memo1.Lines.Add(CkHttp__lastErrorText(http));
    Exit;
  end;

// This is the request that is sent:
// Notice that utf-8 is used in the query param (the letter 'Æ' is %C3%A6)

// 	POST /something HTTP/1.1
// 	Host: www.chilkatsoft.com
// 	Content-Type: application/x-www-form-urlencoded
// 	Content-Length: 15
// 
// 	name=M%C3%A6RSK

// ---------------------------------------------------------------
// Let's do a POST with XML body where the query params are in the HTTP request start line, 
// and the Content-Type is text/xml where the body of the request is XML.

CkHttpRequest_putPath(req,'/something');
CkHttpRequest_putHttpVerb(req,'POST');
CkHttpRequest_putContentType(req,'text/xml');
success := CkHttpRequest_LoadBodyFromString(req,'<test>123</test>','utf-8');
CkHttpRequest_putCharset(req,'utf-8');

// Remember... our request object still contains the query param added in the above call to AddParam.
success := CkHttp_HttpSReq(http,'www.chilkatsoft.com',443,True,req,resp);
if (success = False) then
  begin
    Memo1.Lines.Add(CkHttp__lastErrorText(http));
    Exit;
  end;

// This is the request that is sent:
// Notice that utf-8 is used in the query param (the letter 'Æ' is %C3%A6)

// 	POST /something?name=M%C3%A6RSK HTTP/1.1
// 	Host: www.chilkatsoft.com
// 	Content-Type: text/xml
// 	Content-Length: 16
// 
// 	<test>123</test>

CkStringBuilder_Dispose(sb);
CkHttp_Dispose(http);
CkHttpRequest_Dispose(req);
CkHttpResponse_Dispose(resp);

end;