On Wed, Feb 2, 2011 at 5:06 PM, Tony Anecito <adanecito@xxxxxxxxx> wrote: > Hi All, > > I am wondering for the browser cache to work does the expires headers in the > apache config file have to be setup? Or by default when the page request from > the browser hits apache does it look at the file modified time stamp for the > file on disk or Apache cache and compares to whatever the request has in it (I > assume a file timestamp)? > > Just trying to figure out if expires header is really needed because if you use > it by setting a future date then the only way to get the file sent across due to > some change is to rename it slightly. > > Thanks, > -Tony > Correct, sending an Expires header will make UA caches store the object unconditionally until it gets ejected or the date specified is reached. Instead of sending Expires, if you send a Last-Modified header (which will happen by default for files served from disk by Apache), then the next time the UA requests that, it should add a header If-Modified-Since header. If the file hasn't been modified since that time, then Apache will send an empty 304 response (Not Modified), and the UA will serve from cache. Cheers Tom --------------------------------------------------------------------- The official User-To-User support forum of the Apache HTTP Server Project. See <URL:http://httpd.apache.org/userslist.html> for more info. To unsubscribe, e-mail: users-unsubscribe@xxxxxxxxxxxxxxxx " from the digest: users-digest-unsubscribe@xxxxxxxxxxxxxxxx For additional commands, e-mail: users-help@xxxxxxxxxxxxxxxx
|