ResponseStream:=TStringStream.Create('');
        PostStream := TStringStream.Create('');
        PostStream.Position:= 0 ;
        PostStream.WriteString('param1=111¶m2=222');
        IdHttp1.post('http://127.0.0.1/script.asp',PostStream, responsestream);
        ResponseStream.Position:= 0 ;
        Memo1.Lines.Add(ResponseStream.ReadString(ResponseStream.Size)) ;

<FORM name=form1 action=http:// 127 . 0 . 0 . 1 : 75 /script.asp method=post>
<INPUT type=text name=param1 value= 111 >
<INPUT type=text name=param2 value= 222 >
<input type=submit>
</form>