Lazarus Pascal

Example: Http.CloseAllConnections method

See more HTTP Examples

Demonstrates how to call the CloseAllConnections method. 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.StringBuilder,
  Chilkat.Http;

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

procedure RunDemo;
var
  success: Boolean;
  http: THttp;
  url: string;
  sbJson: TStringBuilder;
  statusCode: Integer;

begin
  success := False;

  http := THttp.Create;

  //  Demonstrate 
  url := 'https://finnhub.io/api/v1/quote?symbol={$symbol}&token={$api_key}';

  //  When the request is sent, the {$symbol} is replaced with "MSFT"
  //  and the {$api_key} is replaced with "1234567890ABCDEF"
  http.SetUrlVar('symbol','MSFT');
  http.SetUrlVar('api_key','1234567890ABCDEF');

  sbJson := TStringBuilder.Create;
  success := http.QuickGetSb(url,sbJson);
  if (success = False) then
    begin
      WriteLn(http.LastErrorText);
      Exit;
    end;

  statusCode := http.LastStatus;
  WriteLn(http.LastResponseHeader);

  //  The response header contains this:

  //  Date: Tue, 19 Aug 2025 12:18:56 GMT
  //  Content-Type: application/json; charset=utf-8
  //  Transfer-Encoding: chunked
  //  Connection: keep-alive
  //  Content-Encoding: gzip

  //  The "Connection: keep-alive" header ensures the server keeps the connection open for subsequent requests.
  //  If the server responds with a "Connection: close" header, it indicates the connection will be closed after the response. 
  //  Consequently, Chilkat will also close the connection, requiring a new one to be established for any subsequent requests to the same server.

  //  If your application uses the same HTTP object instance to send requests to a different server, a new connection will be established with that server.
  //  Existing connections remain open, with Chilkat maintaining up to 10 open connections. 
  //  If all 10 connections are in use, Chilkat will close the least recently used connection to connect to a new server.

  //  Your application can explicitly close all open connections like this:
  success := http.CloseAllConnections();
  if (success = False) then
    begin
      WriteLn(http.LastErrorText);
      Exit;
    end;

  WriteLn('Success.');


  http.Free;
  sbJson.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.