I finally found the reason of this behavior. I realize that if I waited a couple of minutes, Firefox would send the "if-none-match" header which was responded by the 304 code by solr.
What happens is that Firefox keeps a disk cache. If a response contains the header "Last-Modified", even if there is a etag header, Firefox computes an expiration date which was about 5 minutes for my request. And during that period, the request was served from the cache. You can see the expiration date by looking at about:cache in Firefox. The rules to compute the expiration time depending on the headers is described here: https://developer.mozilla.org/En/HTTP_Caching_FAQ I realize that this was a Firefox issue. Sorry to have disrupt this list. Pascal Dimassimo wrote: > > Sorry, the xml of the solrconfig.xml was lost. It is > > <httpCaching lastModifiedFrom="openTime" etagSeed="Solr"> > </httpCaching> > > Hi guys, > > I'm having trouble understanding the behavior of firefox and the etag. > > After cleaning the cache, I send this request from firefox: > > GET /solr/select/?q=television HTTP/1.1 > Host: localhost:8088 > User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.0.6) > Gecko/2009011913 Firefox/3.0.6 (.NET CLR 3.5.30729) > Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8 > Accept-Language: en-us,en;q=0.5 > Accept-Encoding: gzip,deflate > Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7 > Keep-Alive: 300 > Connection: keep-alive > Cookie: JSESSIONID=AA71D602A701BB6287C60083DD6879CD > > Which solr responds with: > > HTTP/1.1 200 OK > Last-Modified: Thu, 19 Feb 2009 19:57:14 GMT > ETag: "NmViOTJkMjc1ODgwMDAwMFNvbHI=" > Content-Type: text/xml; charset=utf-8 > Transfer-Encoding: chunked > Server: Jetty(6.1.3) > (#data following#) > > So far so good. But then, I press F5 to refresh the page. Now if I > understand correctly the way the etag works, firefox should send the > request with a "if-none-match" along with the etag and then the server > should return a 304 "not modified" code. > > But what happens is that firefox just don't send anything. In the firebug > window, I only see "0 requests". Just to make sure I test with tcpmon and > nothing is sent by firefox. > > Is this making sense? Am I missing something? > > My solrconfig.xml has this config: > > > > > Thanks! > > -- View this message in context: http://www.nabble.com/Question-about-etag-tp22125449p22167528.html Sent from the Solr - User mailing list archive at Nabble.com.