<html><head><style>body{font-family:Helvetica,Arial;font-size:13px}</style></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;"><div id="bloop_customfont" style="color: rgb(0, 0, 0); margin: 0px;"><div id="bloop_customfont" style="margin: 0px;"><font face="HelveticaNeue"><span style="font-size: 18px;">Hi， All:</span></font></div><div id="bloop_customfont" style="margin: 0px;"><font face="HelveticaNeue"><span style="font-size: 18px;"><span class="Apple-tab-span" style="white-space:pre"> </span>I need varnish to return data directly and update cache at every time when the backend is ok. I also need varnish to return the last normal beresq data from the cache when the backend is down. How shuold I do with varnish?</span></font></div><div id="bloop_customfont" style="margin: 0px;"><font face="HelveticaNeue"><span style="font-size: 18px;"><br></span></font></div><div id="bloop_customfont" style="margin: 0px;"><font face="HelveticaNeue"><span style="font-size: 18px;">Thanks.</span></font></div></div></body></html>