How to force urllib2 to fetch newly files.

[Toomore]

I have a problem about useing urllib2 to fetch files.
If I use urllib2 to fetch a file more times in one day, when the files is update, useing urllib2 is still fetch old files.

So how do I force urllib2 to fetch newly files.
Now I have added random no. at the end of URL, but it still fetch old files.

Thanks.

[Ikai Lan (Google)]

Which URL are you fetching? Could it be possible they are caching this on their side?

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Ikai Lan 
Developer Programs Engineer, Google App Engine

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[Toomore]

someone like this:

http://www.twse.com.tw/ch/trading/exchange/STOCK_DAY/STOCK_DAY_print.php?genpage=genpage/Report201012/201012_F3_1_8_8261.php&type=csv&r=72560

which is about Taiwan stock data.(stock no is 8261)

If I fetch more times in one day, it can't to fetch the newly data, even if the stock is close.

I also add random no. at the end of URL, but can not work.

Thanks.