Delphi HTTPClient формирование TIdMultiPartFormDataStream

[AndreyAVM]

Я посылаю из Delphi приложения post запросы используя компонент THTTPClient. Тело запроса формирую с помощью TIdMultiPartFormDataStream. Но в последнем разделе "HTML Form URL Encoded" получается какая-то мешанина заголовков. Ниже код и тело пакета из сниффера.

HTTPCommandClient: THTTPClient;

...

HTTPCommandClient := THTTPClient.Create;
with HTTPCommandClient do
begin
ConnectionTimeout := 10000;
ResponseTimeout := 10000;
CustomHeaders['Accept'] := '*/*';
CustomHeaders['Content-Type'] := 'application/x-www-form-urlencoded';
CustomHeaders['X-Requested-With'] := 'XMLHttpRequest';
CustomHeaders['Accept-Encoding'] := 'gzip, deflate';
CustomHeaders['Accept-Language'] := 'ru-RU';
end;

...

procedure TIPSwitchNetworkPortsForm.ResetAllC ountSpeedButtonClick(Sender: TObject);
var commandFormData: TIdMultiPartFormDataStream;
begin
commandFormData := TIdMultiPartFormDataStream.Create;
try
commandFormData.AddFormField('all', '');
try
HTTPCommandResponse := HTTPCommandClient.Post('http://' +
fIPAddress + '/clearportsstat?section=STAT', commandFormData);
except
end;
finally
commandFormData.Free;
end;
end;

Далее тело пакета, которое получилось:

Hypertext Transfer Protocol
POST /clearportsstat?section=STAT HTTP/1.1\r\n
Connection: Keep-Alive\r\n
Content-Type: application/x-www-form-urlencoded\r\n
Accept: */*\r\n
Accept-Encoding: gzip, deflate\r\n
Accept-Language: ru-RU\r\n
User-Agent: Embarcadero URI Client/1.0\r\n
X-Requested-With: XMLHttpRequest\r\n
Content-Length: 175\r\n
Host: 192.168.10.30\r\n
\r\n
[Full request URI: http://192.168.10.30/clearportsstat?section=STAT]
[HTTP request 5/5]
[Prev request in frame: 520]
[Response in frame: 641]
File Data: 175 bytes
HTML Form URL Encoded: application/x-www-form-urlencoded
Form item: "----------110819143947701
Content-Disposition: form-data; name" = ""all"
Content-Type: text/plain
Content-Transfer-Encoding: quoted-printable


----------110819143947701--
"
Key: ----------110819143947701\r\nContent-Disposition: form-data;
name
Value: "all"\r\nContent-Type: text/plain\r\nContent-Transfer-
Encoding: quoted-printable\r\n\r\n\r\n----------110819143947701--\r\n

А вот то, что я ожидаю получить:

HTML Form URL Encoded: application/x-www-form-urlencoded
Form item: "all" = ""
Key: all
Value: