(Delphi DLL) REST through HTTP Proxy

Demonstrates how to connect through an HTTP proxy to make REST API calls.

Chilkat for Delphi Downloads Chilkat non-ActiveX DLL for Delphi Chilkat ActiveX DLL for Delphi * The examples here use the non-ActiveX DLL.

uses
    Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics,
    Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.StdCtrls, AuthAws, Rest, Xml, Socket;

...

procedure TForm1.Button1Click(Sender: TObject);
var
rest: HCkRest;
socket: HCkSocket;
bTls: Boolean;
port: Integer;
maxWaitMs: Integer;
success: Boolean;
authAws: HCkAuthAws;
responseXml: PWideChar;
xml: HCkXml;

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

// This example connects to a REST server through an HTTP proxy.
// It will connect to the Amazon AWS service for this example.
rest := CkRest_Create();
socket := CkSocket_Create();

// Set the HTTP proxy domain or IP address, and port.
CkSocket_putHttpProxyHostname(socket,'192.168.1.100');
CkSocket_putHttpProxyPort(socket,8088);

// We want to tell the socket object that we're doing HTTP over the proxy connection.
// This is because an HTTP proxy used for other protocols (IMAP, SMTP, SSH, FTP, etc.) 
// can require some internal differences in behavior (i.e. how we do things).
CkSocket_putHttpProxyForHttp(socket,True);

// Other properties exist for specifying a proxy login, password, and authentication method (such as NTLM),
// but these are not used in this example.

// Connect through the HTTP proxy to the Amazon AWS server for the S3 service.
bTls := True;
port := 443;
maxWaitMs := 5000;
success := CkSocket_Connect(socket,'s3.amazonaws.com',port,bTls,maxWaitMs);
if (success <> True) then
  begin
    Memo1.Lines.Add('Connect Failure Error Code: ' + IntToStr(CkSocket_getConnectFailReason(socket)));
    Memo1.Lines.Add(CkSocket__lastErrorText(socket));
    Exit;
  end;

// Use the proxied TLS connection:
success := CkRest_UseConnection(rest,socket,True);
if (success <> True) then
  begin
    Memo1.Lines.Add(CkRest__lastErrorText(rest));
    Exit;
  end;

// Provide AWS credentials for the REST call.
authAws := CkAuthAws_Create();
CkAuthAws_putAccessKey(authAws,'AWS_ACCESS_KEY');
CkAuthAws_putSecretKey(authAws,'AWS_SECRET_KEY');
CkAuthAws_putServiceName(authAws,'s3');
success := CkRest_SetAuthAws(rest,authAws);

// List all buckets for the account...
responseXml := CkRest__fullRequestNoBody(rest,'GET','/');
if (CkRest_getLastMethodSuccess(rest) <> True) then
  begin
    Memo1.Lines.Add(CkRest__lastErrorText(rest));
    Exit;
  end;

xml := CkXml_Create();
success := CkXml_LoadXml(xml,responseXml);

// Show the full XML returned.
Memo1.Lines.Add(CkXml__getXml(xml));

// Iterate over the buckets, showing each bucket name.
success := CkXml_FindChild2(xml,'Buckets');
if (CkXml_FirstChild2(xml) = True) then
  begin
    Memo1.Lines.Add(CkXml__getChildContent(xml,'Name'));
    while (CkXml_NextSibling2(xml) = True) do
      begin
        Memo1.Lines.Add(CkXml__getChildContent(xml,'Name'));
      end;

  end;
// Move the internal pointer back to the root node.
CkXml_GetRoot2(xml);

CkRest_Dispose(rest);
CkSocket_Dispose(socket);
CkAuthAws_Dispose(authAws);
CkXml_Dispose(xml);

end;