Lazarus Pascal Requires Chilkat v11.0.0+

Example: Http.HttpSb method

Shows how to use the HttpSb method to send an HTTP POST request with a StringBuilder as the request body. The example sends the following request:

POST /echo_request_body.asp HTTP/1.1
Host: chilkatsoft.com
Accept: */*
Accept-Encoding: gzip
Content-Type: application/json
Content-Length: 26

{"greeting":"Hello World"}

Also see: Chilkat Http Default and Auto-Filled Headers

Lazarus Pascal

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;

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

procedure RunDemo;
var
  success: Boolean;
  http: THttp;
  sb: TStringBuilder;
  url: string;
  resp: THttpResponse;

begin
  success := False;

  http := THttp.Create;
  success := False;

  sb := TStringBuilder.Create;
  sb.Append('{"greeting":"Hello World"}');

  //  This URL echoes the contents of the request body, letting us view it.
  url := 'https://chilkatsoft.com/echo_request_body.asp';

  //  Send a POST with the contents of the StringBuilder in the HTTP request body.
  resp := THttpResponse.Create;
  success := http.HttpSb('POST',url,sb,'utf-8','application/json',resp);
  if (success = False) then
    begin
      WriteLn(http.LastErrorText);
      Exit;
    end;

  WriteLn('Response Status Code: ' + resp.StatusCode);

  //  Examine the request we sent.
  //  The LastHeader property stores the HTTP request header of the most recent request sent,
  //  and in this instance, the response body mirrors the request body.
  WriteLn(http.LastHeader);
  WriteLn(resp.BodyStr);

  //  Output:

  //  POST /echo_request_body.asp HTTP/1.1
  //  Host: chilkatsoft.com
  //  Accept: */*
  //  Accept-Encoding: gzip
  //  Content-Type: application/json
  //  Content-Length: 26
  //  
  //  {"greeting":"Hello World"}


  http.Free;
  sb.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.