expirationtime on images( ico, gif)

[Mark <se...@yahoo.com>]

Hello,
I'd like to know when the default expiration time set on images.
Here an example:

Http request was generated on Wednesday, September 07, 2005 10:01:41
AM

I've gor the following expire times (I'm using firefox and got the
information from the page info):
for *ico is  Friday, September 09, 2005 11:20:20 PM
for *.gif is Wednesday, September 07, 2005 10:01:41 AM

I have tomcat 5.0.24 on Redhat 9.

Note, I have a filter with following code in doFilter:

    HttpServletResponse resp = (HttpServletResponse)response;
    resp.setHeader("Cache-Control", "max-age=" + 86400);


in web.xml I have:
  <filter>
    <filter-name>cFilter</filter-name>
    <filter-class>MyFilter</filter-class>
  </filter>
  <filter-mapping>
    <filter-name>cFilter</filter-name>
    <url-pattern>/*gif</url-pattern>
  </filter-mapping>


Also my HTML output I have the following code to prevent caching:

<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="Cache-Control" content="no-cache, no-store,
must-revalidate, post-check=0, pre-check=0">
<meta http-equiv="Expires" content="Tue, 01-Sep-05 12:00:00 GMT">

The question is why *ico files have expiration time in the future,
but  all gif files have the expiration time of http request.

*gif files somewho are not cached and I see it in tomcat access log
files that they was requested and return status for them is 304 (not
changed)

Thanks,
Mark.

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