Can someone please help me with a HTTP caching question?
I thought that if I set the "Expires" and "Cache-Control:max-age" request headers, then a browser wouldn't make a GET request until after the max-age had passed?
My server is seeing lots of conditional GET requests, and it replies with a 304. However, I'd like to eliminate these conditional GETs if possible and have the browser only ask for a resource once it thinks it has expired.
Here's the details I get from the developer tools in Chrome:
Request URL:http://localhost:8080/img/branding.gif Request Method:GET Status Code:304 Not Modified
Cache-Control:max-age=0 If-Modified-Since:Thu, 22 Jul 2010 10:54:34 GMT Referer:http://localhost:8080/ User-Agent:Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US) AppleWebKit/533.4 (KHTML, like Gecko) Chrome/5.0.375.99 Safari/533.4
Cache-Control:max-age=2246400, s-maxage=0 Connection:Keep-Alive Content-Location:/img/branding.gif Content-Type:image/gif Date:Fri, 23 Jul 2010 15:06:10 GMT Expires:Fri, 07 Jan 2011 15:06:10 GMT Keep-Alive:timeout=15, max=100 Last-Modified:Thu, 22 Jul 2010 10:54:34 GMT Pragma:cache Server:Oracle Application Server Containers for J2EE 10g (188.8.131.52.0)
I set the cache headers in a filter in my Java code. The code is running on Oracle's OC4J.
Also, I want to run this over HTTPS. Will using the same headers work for HTTPS too?
Thanks in advance.