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<TD bgColor=#6595d6 height=25><IMG height=11
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align=absBottom><STRONG style="COLOR: white"> 主題：軟考英語精典短文每日一練What is
"caching"?</STRONG></TD></TR>
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<TD width=64>作 者</TD>
<TD width=233>251547129</TD>
<TD width=63>閱讀次數</TD>
<TD width=85>17</TD>
<TD width=63>回復次數</TD>
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<TD width=233>基礎應用與新手入門>> IT英語</TD>
<TD width=63>發表日期</TD>
<TD width=85>2006-10-14</TD>
<TD width=63>回復日期</TD>
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width=85>2006-10-14</TD></TR></TBODY></TABLE></TD></TR></TBODY></TABLE></TD></TR></TBODY></TABLE>
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<DIV class=userInfoBox>積分：-37<BR>第一級</DIV>
<DIV class=userInfoBox>注冊時間<BR>2006-5-26</DIV></DIV></TD>
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<DIV class=TitleInfoBox align=right>發表時間：2006-10-14 22:58:28 樓主</DIV>
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<DIV id=cont_right style="WIDTH: 495px">Caching refers to the strategy of
keeping a copy of a page or image you have already seen; web browsers
typically cache files that they display for you, and simply ask the server
if the page has actually changed rather than always downloading the entire
thing. This speeds up your next visit to the page. <BR>Since caching
everything forever would take up too much space, web browsers typically
delete the least recently used file in the cache when a certain total
cache size is reached. <BR><BR>Caching also occurs in other places. You
may be using a proxy server, in which case the proxy server is probably
caching pages on behalf of you and other users to save trips to the real
Internet. <BR><BR>Users typically become aware of caching when things
don't work as expected. For instance, you might make a change to your own
web page, open up your web page in your web browser, and not see the
change until you click the "reload" button, telling your browser to
discard the cached copy of that page. <BR><BR>Of course, some things, such
as credit card transactions, should not be cached. Fortunately, the HTTP
protocol that web browsers and servers use to communicate includes ways
for the web server to specify how long a page may be safely cached, if at
all. But sometimes browsers do not perfectly obey such directives. The
problem that is made worse by the tendency of web sites built in PHP, ASP
or other dynamic web programming languages to tell the web browser not to
cache anything. This problem is not inherent to those languages, but it is
a common result of poorly-thought-out site design. <BR><BR>Caching can
potentially be a privacy issue for those who share their
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