Pascal (Lazarus/Delphi)

TCP Socket Connect through HTTP Proxy

See more Socket/SSL/TLS Examples

Demonstrates how to connect through an HTTP proxy server. 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.Socket;

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

procedure RunDemo;
var
  success: Boolean;
  socket: TSocket;
  hostname: string;
  ssl: Boolean;
  maxWaitMillisec: Integer;
  receivedMsg: string;

begin
  success := False;

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

  socket := TSocket.Create;

  //  To connect through an HTTP proxy, set the HttpProxyHostname
  //  and HttpProxyPort properties to the hostname (or IP address)
  //  and port of the HTTP proxy.  Typical port numbers used by
  //  HTTP proxy servers are 3128 and 8080.
  socket.HttpProxyHostname := 'www.my-http-proxy.com';
  socket.HttpProxyPort := 3128;

  //  Important:  Your HTTP proxy server must allow non-HTTP
  //  traffic to pass.  Otherwise this does not work.

  //  Connect (via the HTTP proxy) to port 5555 of 192.168.1.108.
  //  hostname may be a domain name or IP address.
  hostname := '192.168.1.108';
  ssl := False;
  maxWaitMillisec := 20000;
  success := socket.Connect(hostname,5555,ssl,maxWaitMillisec);
  if (success <> True) then
    begin
      WriteLn(socket.LastErrorText);
      Exit;
    end;

  //  Set maximum timeouts for reading an writing (in millisec)
  socket.MaxReadIdleMs := 10000;
  socket.MaxSendIdleMs := 10000;

  //  The ficticious server (in this example) is going to send a "Hello World!" 
  //  message.  Read it:
  receivedMsg := socket.ReceiveString();
  if (socket.LastMethodSuccess <> True) then
    begin
      WriteLn(socket.LastErrorText);
      Exit;
    end;

  //  Close the connection with the server
  //  Wait a max of 20 seconds (20000 millsec)
  success := socket.Close(20000);

  WriteLn(receivedMsg);


  socket.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.