Pascal (Lazarus/Delphi)

HTTP PUT JSON

See more HTTP Examples

Demonstrates how to send a JSON PUT and get the JSON response body. 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.HttpRequest,
  Chilkat.HttpResponse;

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

procedure RunDemo;
var
  success: Boolean;
  req: THttpRequest;
  http: THttp;
  jsonText: string;
  resp: THttpResponse;

begin
  success := False;

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

  req := THttpRequest.Create;
  http := THttp.Create;

  //  The PUT request to be sent will look like this:

  //  PUT /request HTTP/1.1
  //  Content-Type: application/jsonrequest
  //  Cookie: JSESSIONID=1234
  //  Content-Encoding: identity
  //  Host: json.penzance.org
  //  Accept: application/jsonrequest
  //  Accept-Encoding:
  //  Content-Length: 72
  //  
  //  {"user":"doctoravatar@penzance.com","forecast":7,"t":"vlIj","zip":94089}

  //  First, remove default header fields that would be automatically
  //  sent.  (These headers are harmless, and shouldn't need to 
  //  be suppressed, but just in case...)
  http.AcceptCharset := '';
  http.UserAgent := '';
  http.AcceptLanguage := '';

  //  Suppress the Accept-Encoding header by disallowing 
  //  a gzip response:
  http.AllowGzip := False;

  //  If a Cookie needs to be added...
  http.SetRequestHeader('Cookie','JSESSIONID=1234');

  //  Add the Content-Encoding: identity header.
  http.SetRequestHeader('Content-Encoding','identity');

  //  Modify the default "Accept" header:
  http.Accept := 'application/jsonrequest';

  jsonText := '{"user":"doctoravatar@penzance.com","forecast":7,"t":"vlIj","zip":94089}';

  //  IMPORTANT: Make sure to change the URL, JSON text,
  //  and other data items to your own values.  The URL used
  //  in this example will not actually work.

  resp := THttpResponse.Create;
  success := http.HttpStr('PUT','http://json.penzance.org/request',jsonText,'utf-8','application/jsonrequest',resp);
  if (success = False) then
    begin
      WriteLn(http.LastErrorText);
      Exit;
    end;

  WriteLn('Response status code: ' + resp.StatusCode);
  WriteLn('Response JSON:');
  WriteLn(resp.BodyStr);


  req.Free;
  http.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.