TIdHTTP的get函数对字符串有长度限制呢？

[披着虎皮的石头]

用下面的函数，去发送下面的URL，以get函数发出去出现错误提示。
而用post方式发出去，就正常，是不是TIdHTTP的get函数对字符串有长度限制呢？

//根据URl，发送Http get请求，得到Xml的对象或String的通用函数
function getReturn(urlStr :string; RtlType :String; var XmlDoc :TXmlDocument; var Rlt_Str :String) :Boolean;
var IdHTTP1 :TIdHTTP; RtnStream :TMemoryStream;
begin
   Result :=false;

   IdHTTP1 :=Tidhttp.Create(nil);

   try
      with IdHTTP1 do begin
         Request.Accept            :='text/html, */*';
         Request.ContentLength     :=0;
         Request.ContentRangeEnd   :=0;
         Request.ContentRangeStart :=0;
         Request.UserAgent         :='Mozilla/3.0 (compatible; Indy Library)';
     end;

     try
        RtnStream :=TMemoryStream.Create;
        IdHTTP1.get(urlStr, RtnStream); 

        Rlt_Str :=StreamToStr(RtnStream); //得到string
     except
        on E: Exception do begin
           Msg(e.Message, 0, 0); RtnStream.free; idhttp1.Disconnect; idhttp1.Free; Exit;
        end;
     end;
   finally
     RtnStream.free; idhttp1.Disconnect; idhttp1.Free;
   end;

   Result :=true;
end;

URL的例子：
http://ssdd.buy.com/routerjson?access_token=XXXXXXXXXXBBBBBBBBBBBBBBBBBBB7c&
app_key=XXXXXXX1AAAAAAAAAAAAAAAAAAAAA5&method=360buy.order.search×tamp=2013-07-17%2013:33:52&v=2.0&
360buy_param_json="end_date":"2013-07-17 13:33:52","fields":"order_id","method":"360buy.order.search",
"order_state":"WAIT_SELLER_STOCK_OUT","page_size":"100","page":"1","start_date":"2013-07-07 13:33:52"&
sign=43D2A6CC93495282A6F18BA8E66BFCCB

[披着虎皮的石头]

或许不是get方法的问题。 而是京东网站接口要求用post方式。