Add Cookies on Post with Indy components (Delphi XE6)?

I have a cookiesmanager attached to IdHTTP component in a form.

var
  XMLRqst     : string;
  XMLResponse : TStringStream;
  XMLRequest  : TStringStream;
...
begin
...
   IdHTTP1.CookieManager.CookieCollection.Add;
   IdHTTP1.CookieManager.CookieCollection[ IdHTTP1.CookieManager.CookieCollection.Count -1 ].CookieName := 'data';
   IdHTTP1.CookieManager.CookieCollection[ IdHTTP1.CookieManager.CookieCollection.Count -1 ].Value      := '<root user="yyy" company="xxxx">';
   IdHTTP1.CookieManager.CookieCollection[ IdHTTP1.CookieManager.CookieCollection.Count -1 ].Path       := '/';

...
XMLRequest  := TStringStream.Create( XMLRqst, TEncoding.Unicode );
...
idHTTP1.Post( 'http://mysite/api', XMLRequest, XMLResponse );
idHTTP1.Disconnect;

I am never receiving the "data" cookie.

How to send properly cookies with http post trough Indy's IdHTTP component in Delphi XE6?

Solution

Here is some working code:

procedure SendACookie;
var
  HTTP: TIdHTTP;
  URI: TIdURI;
  ASource: TStringStream;
begin
  HTTP := TIdHTTP.Create;
  try
    HTTP.CookieManager := TIdCookieManager.Create(HTTP);

    URI := TIdURI.Create('http://localhost');
    try
      HTTP.CookieManager.AddServerCookie('habari=mycookievalue', URI);
    finally
      URI.Free;
    end;

    ASource := TStringStream.Create('');
    try
      WriteLn('POST response:');
      WriteLn(HTTP.Post('http://localhost/cookies/', ASource));
    finally
      ASource.Free;
    end;
  finally
    HTTP.Free;
  end;
end;

Server side (using an Indy-based HTTP framework):

procedure TShowCookiesResource.OnPost(Request: TIdHTTPRequestInfo; Response: TIdHTTPResponseInfo);
var
  I: Integer;
  Cookie: TIdCookie;
  HTML: string;
begin
  HTML := '<html>' + #13#10;

  HTML := HTML + Format('<p>%d cookies found:</p>' + #13#10, [Request.Cookies.Count]);

  for I := 0 to Request.Cookies.Count - 1 do
  begin
    Cookie := Request.Cookies[I];
    HTML := HTML + Format('<p>%s</p>' + #13#10,
      [Cookie.CookieName + ': ' + Cookie.Value]);
  end;

  HTML := HTML + '</html>';

  Response.ContentText := HTML;
  Response.ContentType := 'text/html';
  Response.CharSet := 'utf-8';
end;

Output:


    Hit any key to send a cookie.

    POST response:
    1 cookies found:
    habari: mycookievalue

TL;DR

Use the TIdHTTP.CookieManager.AddServerCookie method to add the cookie to the IdHTTP instance which should be sent with the request.