Pascal (Lazarus/Delphi)

Send XML REST Request, Get Response with No Body (Google Cloud Storage)

See more REST Examples

Demonstrates sending a RESTful XML request, and receiving a response where the expected response is a header with no body (Content-Length = 0). This example will create a bucket in Google Cloud Storage using the Google Cloud Storage XML API.

See Create a Bucket using the XML API for additional request options.

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.AuthGoogle,
  Chilkat.Xml,
  Chilkat.Rest;

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

procedure RunDemo;
var
  success: Boolean;
  gAuth: TAuthGoogle;
  rest: TRest;
  bAutoReconnect: Boolean;
  xmlReqBody: TXml;
  responseStr: string;
  responseStatus: Integer;

begin
  success := False;

  //  This example will create a bucket in Google Cloud Storage using the XML API.

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

  gAuth := TAuthGoogle.Create;
  //  Obtain an access token as shown in one of the following examples:
  //  See Get Access Token using a Service Account JSON Key
  //  See Get Access Token using a P12 File

  rest := TRest.Create;

  //  Connect using TLS.
  bAutoReconnect := True;
  success := rest.Connect('www.googleapis.com',443,True,bAutoReconnect);

  //  Provide the authentication credentials (i.e. the access key)
  success := rest.SetAuthGoogle(gAuth);

  //  Build the XML request body for creating a bucket.
  //  See https://cloud.google.com/storage/docs/xml-api/put-bucket-create
  xmlReqBody := TXml.Create;
  xmlReqBody.Tag := 'CreateBucketConfiguration';
  xmlReqBody.NewChild2('LocationConstraint','us');
  xmlReqBody.NewChild2('StorageClass','STANDARD');

  //  Show the HTTP request body we'll be sending.
  WriteLn(xmlReqBody.GetXml());

  //  There are no query parameters...

  //  The HOST header must be specified, because it needs to be different than
  //  the domain previously passed to the Connect method.
  //  The name of the bucket is the 1st part of the HOST header.
  success := rest.AddHeader('Host','chilkat-example-bucket.storage.googleapis.com');

  //  The project ID is specified in an HTTP request header
  success := rest.AddHeader('x-goog-project-id','chilkattest-1050');

  //  In this case, the response body is expected to be empty.  We can still
  //  call FullRequestString.  We expect an empty string to be returned.
  responseStr := rest.FullRequestString('PUT','/',xmlReqBody.GetXml());
  if (rest.LastMethodSuccess <> True) then
    begin
      WriteLn(rest.LastErrorText);
      Exit;
    end;

  //  Check the response status code to make sure it is 200.
  responseStatus := rest.ResponseStatusCode;
  WriteLn('Response Status Code = ' + responseStatus);


  gAuth.Free;
  rest.Free;
  xmlReqBody.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.