Post problems with Indy TIdHTTP

Question

I am having issues posting to Amazon's SES Service using Indy's TIdHTTP.

Here is an example of the code i am using:

procedure TMainFrm.btnAmazonSESClick(Sender: TObject);
var
  SSLHandler: TIdSSLIOHandlerSocket;
  HttpClient: TIdHTTP;  
  Params: TStringStream;
begin
  SSLHandler := TIdSSLIOHandlerSocket.Create(Self);
  HttpClient := TIdHTTP.Create(Self);  
  Params := TStringStream.create('');
  try
    with SSLHandler do
      SSLOptions.Method := sslvSSLv3
    with HttpClient do
    begin
      IOHandler := SSLHandler;
      AllowCookies := True;
      HandleRedirects := True;
      HTTPOptions := [hoForceEncodeParams];
      Request.ContentType := 'application/x-www-form-urlencoded';
    end;

    PageMemo.Text := HttpClient.Post('https://email.us-east-1.amazonaws.com?Action=VerifyEmailAddress&AWSAccessKeyId=012Some123Key46&EmailAddress=test@test%2Ecom', Params);

  finally
    SSLHandler.Free;
    HttpClient.Free; 
    Params.Free;
  end;
end;

Result

• Under Indy 10.5.7 I get the error: HTTP/1.1 404 Not Found

• Under Indy 9.0.14 I get the error: Socket Error # 11004

Debugging Trials

• This same demo can successfully GET the HTML from an HTTPS web page.

• If i paste the URL above into a browser it displays the expected XML result.

I would appreciate any advice on the cause.

Answer 1

This post is just an incomplete wild guess.

Maybe Remy might help you to correct it. With the following code I'm getting HTTP/1.1 400 Bad Request but I'm not wondering because the API reference talks about Common Query Parameters where is at least required the digital signature you'll create for the request what I don't know how to do.

I can't test this at all because I have no account there. But I think the

procedure TForm1.Button1Click(Sender: TObject);
var
  HTTPClient: TIdHTTP;
  Parameters: TStrings;
  SSLHandler: TIdSSLIOHandlerSocketOpenSSL;

begin
  SSLHandler := TIdSSLIOHandlerSocketOpenSSL.Create(nil);
  HTTPClient := TIdHTTP.Create(nil);
  Parameters := TStringList.Create;

  try
    SSLHandler.SSLOptions.Method := sslvSSLv3;
    SSLHandler.SSLOptions.Mode := sslmUnassigned;

    HTTPClient.IOHandler := SSLHandler;
    HTTPClient.HTTPOptions := [hoForceEncodeParams];
    HTTPClient.Request.ContentType := 'application/x-www-form-urlencoded';

    Parameters.Add('Action=VerifyEmailAddress');
    Parameters.Add('[email protected]');
    Parameters.Add('AWSAccessKeyId=012Some123Key46');
    Parameters.Add('SignatureVersion=2');
    Parameters.Add('Expires='); // ???
    Parameters.Add('Signature='); // ???

    PageMemo.Text := HTTPClient.Post('https://email.us-east-1.amazonaws.com', Parameters);

  finally
    SSLHandler.Free;
    HTTPClient.Free; 
    Parameters.Free;
  end;
end;