Does native Delphi HTTPClient support SNI? - http

Question

We have to include SNI (Server_Name_Indication) in our rest requests because the server will hosts several virtual domains in the near future. We are using a standard THTTPClient component created at runtime.
As soon as we add a new domain with new certificate we receive an exception
"Server certificate invalid or does not exist"
(translated from the german error text)
Is there a special header value to archive SNI this like for the basic authentication?
Below is a simplified version of our code (no logging, no proxy, fake URL). I apologize that I can not provide the real URL we are using.
We would expect that we must augment the GetRequest method, but did not find any example or hint.
unit Unit1;
interface
uses
Winapi.Windows, WinApi.WinHTTP, System.Classes,
Vcl.Graphics, Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.StdCtrls,
System.Net.HTTPClient;
type
TForm1 = class(TForm)
Button1: TButton;
Edit1: TEdit;
procedure Button1Click(Sender: TObject);
private
function PostRequest(const cRequest, cBody: string): string;
public
{ Public declarations }
end;
type
TMyRestClient = class(TObject)
private
fHTTPClient: THTTPClient;
fSysUrl: string;
fUserID: string;
fPassWD: string;
//...
function GetRequest(const cMethod, cUrl: string): IHTTPRequest;
public
constructor Create(const cUrl: string);
destructor Destroy; override;
function Post(const cRequest, cBody: string): string;
//...
property SystemUrl: string read fSysUrl write fSysUrl;
property Username: string read fUserID write fUserID;
property Password: string read fPassWD write fPassWD ;
end;
var
Form1: TForm1;
implementation
uses
System.SysUtils, System.Variants, System.NetEncoding;
{$R *.dfm}
constructor TMyRestClient.Create(const cUrl: string);
begin
fHTTPClient := THTTPClient.Create;
SystemUrl := cUrl;
end;
destructor TMyRestClient.Destroy;
begin
FreeAndNil(fHTTPClient);
inherited Destroy;
end;
function TMyRestClient.GetRequest(const cMethod, cUrl: string): IHTTPRequest;
begin
Result := fHTTPClient.GetRequest(cMethod, cUrl);
Result.AddHeader('content-type', 'appplication/json');
if (Password <> '') then
Result.AddHeader('Authorization', 'Basic ' + TNetEncoding.Base64.Encode(Username + ':' + Password));
end;
function TMyRestClient.Post(const cRequest, cBody: string): string;
var
iRequest: IHTTPRequest;
iResponse: IHTTPResponse;
aBody: TStringStream;
begin
iRequest := GetRequest('POST', Format('%s/%s', [SystemUrl, cRequest]));
aBody := TStringStream.Create(UTF8String(cBody));
try
iRequest.SourceStream := aBody;
iResponse := fHTTPClient.Execute(iRequest);
finally
aBody.DisposeOf;
end;
if (iResponse.StatusCode <> HTTP_STATUS_OK) then
raise Exception.CreateFmt('Post: %s failed (Code %d) %', [cRequest, iResponse.StatusCode, iResponse.StatusText]);
Result := iResponse.ContentAsString;
end;
function TForm1.PostRequest(const cRequest, cBody: string): string;
var
xClient: TMyRestClient;
begin
xClient := TMyRestClient.Create('www.myserver.com/demo');
try
// Basic authentification (not used)
xClient.Username := '';
xClient.Password := '';
Result := xClient.Post(cRequest, cBody);
finally
xClient.DisposeOf
end;
end;
procedure TForm1.Button1Click(Sender: TObject);
begin
Edit1.Text := PostRequest('retrieve/paramvalue', '{''PARAM'':''VERSION''}' );
end;