KML can't display sometimes and about 304 return

[胡帝]

Hi, there is a question troubled me for a long time. Is there somebody
can help me.

Usually, when I first creat a new kmlLayer and want to show it on map.
KML SERVER return:
_xdc_._qcn0gb && _xdc_._qcn0gb( [0,"kml:... ..."]]] )
and I can show the kmlLayer.
when I creat same kmlLayer after then. SERVR return: HTTP/1.1 304 Not
Modified.
that's good.

But, Sometimes, when I creat a new kmlLayer, SERVRE return:
_xdc_._m8b7fh && _xdc_._m8b7fh( [1] )
that means I can not get this kmlLayer at this time,(I donn't know
why)
but I can get the same kmlLayer form another computer or anoher
explorer.

after that, creat the same kmlLayer again, I will get response:HTTP/
1.1 304 Not Modified.
so. I cannt get this kmlLayer for a long time, except clean the IE
catch.

My question is:

1. Why KML SERVER return _xdc_._m8b7fh && _xdc_._m8b7fh( [1] )
sometimes, when the kml file can open with another computer.

2. How can I retry to get this kmlLayer without responsed by HTTP/1.1
304 Not Modified,
when I get return _xdc_._m8b7fh && _xdc_._m8b7fh( [1] ) something like
this.

and I have tried some methods, such as:
kmlLayer = new google.maps.KmlLayer(kmlUrl + "?rand=" +
Math.Random() );
but, I think it is not a good way, am I?

My Website Address:
http://maps.ly83.com

[Rossko]

Maps API v3 KmlLayer caches your KML for some hours at Google's
servers.

As you have found, the way round that is to add some random appendage
to your URL