Delphi DLL

REST through HTTP Proxy

See more REST Examples

Demonstrates how to connect through an HTTP proxy to make REST API calls. Delphi 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
success: Boolean;
rest: HCkRest;
socket: HCkSocket;
bTls: Boolean;
port: Integer;
maxWaitMs: Integer;
authAws: HCkAuthAws;
responseXml: PWideChar;
xml: HCkXml;

begin
success := False;

// 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;