Pascal (Lazarus/Delphi)

URL Encoding Charset in POST Query Params

See more HTTP Examples

Demonstrates how to control the URL encoding charset in POST query params. Pascal (Lazarus/Delphi)

program ChilkatDemo;

// Demonstrates using the Chilkat Pascal wrapper via the C bridge DLL.
// Builds as a console application under Lazarus (FPC) or Delphi.

{$IFDEF FPC}
  {$MODE DELPHI}
{$ENDIF}
{$APPTYPE CONSOLE}

uses
  {$IFDEF UNIX}
  cthreads,
  {$ENDIF}
  SysUtils,
  CkDllLoader,
  Chilkat.Http,
  Chilkat.StringBuilder,
  Chilkat.HttpResponse,
  Chilkat.HttpRequest;

// ---------------------------------------------------------------------------

procedure RunDemo;
var
  success: Boolean;
  nameWin1252Encoded: string;
  sb: TStringBuilder;
  http: THttp;
  req: THttpRequest;
  resp: THttpResponse;

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 := TStringBuilder.Create;
  success := sb.DecodeAndAppend(nameWin1252Encoded,'url','windows-1252');

  http := THttp.Create;

  //  We're setting the session log filename so we can see the exact request sent.
  http.SessionLogFilename := 'qa_output/sessionLog.txt';

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

  req := THttpRequest.Create;

  //  Set the Charset = "utf-8" to cause URL encoding to use utf-8.
  req.Charset := 'utf-8';

  req.AddParam('name',sb.GetAsString());

  req.HttpVerb := 'POST';
  req.ContentType := 'application/x-www-form-urlencoded';

  resp := THttpResponse.Create;
  success := http.HttpReq('https://www.chilkatsoft.com/something',req,resp);
  if (success = False) then
    begin
      WriteLn(http.LastErrorText);
      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

  req.Charset := 'windows-1252';
  req.HttpVerb := 'POST';
  req.ContentType := 'application/x-www-form-urlencoded';

  success := http.HttpReq('https://www.chilkatsoft.com/something',req,resp);
  if (success = False) then
    begin
      WriteLn(http.LastErrorText);
      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

  req.Path := '/something';
  req.HttpVerb := 'POST';
  req.ContentType := 'application/x-www-form-urlencoded';

  req.Charset := 'utf-8';
  success := http.HttpSReq('www.chilkatsoft.com',443,True,req,resp);
  if (success = False) then
    begin
      WriteLn(http.LastErrorText);
      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.

  req.Path := '/something';
  req.HttpVerb := 'POST';
  req.ContentType := 'text/xml';
  success := req.LoadBodyFromString('<test>123</test>','utf-8');
  req.Charset := 'utf-8';

  //  Remember... our request object still contains the query param added in the above call to AddParam.
  success := http.HttpSReq('www.chilkatsoft.com',443,True,req,resp);
  if (success = False) then
    begin
      WriteLn(http.LastErrorText);
      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>


  sb.Free;
  http.Free;
  req.Free;
  resp.Free;

end;

// ---------------------------------------------------------------------------

begin

  try
    RunDemo;
  except
    on E: Exception do
      WriteLn('Unhandled exception: ', E.ClassName, ': ', E.Message);
  end;

  WriteLn;
  {$IFDEF MSWINDOWS}
  WriteLn('Press Enter to exit...');
  ReadLn;
  {$ENDIF}
end.