Cache-control for browser in WL

Hi,
Is there way to remove the cache-control of the browser from property file?
I found someone suggests this method to avoid "page expire" message from
browser on the web but I can not found any setting in WL's property file.
Please help!
Thanks.
Eric W.

This cannot be set in the weblogic.properties file.
However you can set it on each of your .jsp or html pages
by manipulating meta tags.
<META HTTP-EQUIV="Expires" CONTENT="0">
<META HTTP-EQUIV="Pragma" CONTENT="No-cache">
<META HTTP-EQUIV="Cache-Control" CONTENT="private">
"Eric Wu" <[email protected]> wrote:
Hi,
Is there way to remove the cache-control of the browser
from property file?
I found someone suggests this method to avoid "page expire"
message from
browser on the web but I can not found any setting in
WL's property file.
Please help!
Thanks.
Eric W.

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Rodger Ball
Sr. Software Architect
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If you have the option to use WLP, you can access the com.bea.p13n.cache APIs to write a Control that uses the portal cache functionality, which includes:
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Cache problem for servlet opening new browser window

Requirement:
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I'd definitely try to use a Flex popup... but the
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Cache control directives for Weblogic 6.1

Hello:
I was wondering if anyone knew if one could configure Weblogic 6.1 to produce
cache control headers (ie "Cache-control: max-age=1800")? I realize that I should
probably be using a conventional HTTP server and the WLS plugin, but I'm just
doing some research here. So any help would be appreciated.
Thanks,
Scott Resnik

Can you show us your obj.conf file?
Thanks
Manish

Reader X doesn't display Pdf stream if response contains header "Cache-Control: no-store, no-cache"

Hi all,
I work on a web application that, among others, generates Pdf documents. It renders them directly within the IE window by "streaming" the content of the Pdf in the response output stream. Note that we also add the header "Cache-Control", "no-store, no-cache, must-revalidate,post-check=0, pre-check=0" to the response.
Everything was fine with previous version of reader but since I installed Adobe reader X the content of the Pdf is not showing any more in my browser.
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Hello,
We have semiliar problems in sweden with Adobe Reader X 10.1 Swe and Internet Explorer 8.0 with streamed PDF files.
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So we have to wait for the swedish release on Adobe Reader X 10.1.2
Thanks,
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IT-Mästaren
Sweden

Force cache refresh for my website

Hello,
I have a problem on my website : http://kevinpounot.olympe.in/<br />
This problem appear just with Firefox.
When I update my site with new photo or if I change the main page, the modifications does not appear in Firefox.
The browser just load the caching version of my website and the new stuff is not here.
I already tried some codes like :
<pre><nowiki><HEAD>
<META http-equiv="Cache-Control" content="no-cache">
<META http-equiv="Pragma" content="no-cache">
<META http-equiv="Expires" content="0">
</HEAD> </nowiki></pre>
or
<pre><nowiki><?php
header("Expires: Mon, 26 Jul 1997 05:00:00 GMT");
header("Last-Modified: " . gmdate("D, d M Y H:i:s") . " GMT");
header("Cache-Control: no-cache, must-revalidate");
header("Pragma: no-cache");
?> </nowiki></pre>
Nothing works.
Is there a code which could force the browser to refresh cache and load the latest version of the site ?
PS : Sorry for possible mistakes in my english. ;)

The first thing to check is whether you have any caching plugins like WPSuper cache if you are using a CMS like Wordpress.
These create temporary HTML versions of your page so it is not enough to deactivate them, you have to activate them and then delete their cache from their settings page.
If you are a developer and never want cache loaded then
enter the following into your address bar
about:config
Tell it you understand it is dangerous
enter cache into the search bar and look for
browser.cache.disk.enable
Read about what it does here
http://kb.mozillazine.org/Browser.cache.disk.enable
clicking it sets it to false
This will make firefox slower but will work
You can use this as an alternative
browser.cache.check_doc_frequency
read about it here
http://kb.mozillazine.org/Browser.cache.check_doc_frequency
basically the settings are
0 Check for a new version of a page once per session
1 Check for a new version every time a page is loaded.
2 Never check for a new version - always load the page from cache.
3 Check for a new version when the page is out of date. (Default)
but this does not work so well for me
Note that
browser.cache.disk.enable
must be set to true for
browser.cache.check_doc_frequency
to make any difference
Note that your ISP may be caching, if so consider using different nameservers like openDNS or Google DNS

Can't propagate Cache-Control headers with Surrogate-Control header

My application may set the following response header to cause webcache to process the esi:include's:
Surrogate-Control: content=ORAESI/9.0.4, max-age=3600
It and also may set the following intended for the browser cache:
Cache-Control: private
or say:
Cache-Control: max-age=3600
However Webcache removes this and always adds the following whenever surrogate-control has been set:
Cache-Control: max-age=0
This means I can't have browser caching and esi page compilation, just one or the other.
This seems to be designed behaviour can someone explain why this is and if it can be worked around?
I realise that the Cache-Control header should be ignored by webcache but why cant I propagate it to higher caches?

Patrik,
You'll need to convert the meta http-equiv tags into actual HTTP headers before sending for Web Cache to be able to parse it.

Cache-control, Expires headers

I want JNLP files and JAR files to be cached by JNLP clients, but I want to prevent them from being cached in a browser / proxy server / ISP server of some sort (anything that would prevent the JNLP client from getting updates).
To stop a web page being cached I typically use the following:
response.setDateHeader("Expires", 1L);
// Set standard HTTP/1.1 no-cache headers.
response.setHeader(
"Cache-Control", "no-store, no-cache, must-revalidate");
// Set IE extended HTTP/1.1 no-cache headers (use addHeader).
response.addHeader("Cache-Control", "post-check=0, pre-check=0");
// HTTP 1.0 header
response.setHeader("Pragma", "no-cache");This works well in stopping caching of web-pages, and it doesn't stop the Sun Java Web Start client (JRE 1.5) from caching JNLP / JAR files (I don't think it's actually checking any of the above headers).
However, I have read that setting the above headers can cause problems. Does anyone know the official line on this? I couldn't find anything in the JNLP spec.
If it makes a difference, the app will be deployed only on JRE 1.4 or later.

LateNightMovies,
> Hi, thanks for your reply (and sorry for posting my
question
> twice)...
No worries. :)
> ** unfortunately, your solution doesn't work.
It's possible I didn't understand what you're after.
> My objective is to "not have the page stored" (saved) in
the
> cache (it contains data I don't want stored in client
browsers).
Aha. Nine times out of ten, when people say they want to
want to avoid
cacheing, what they mean is, "Get Flash to always ask for new
data," which
is what that blog entry describes. If it's important that the
data not be
cached at all....
> Adding a ? var - does ensure the page is always
retrieved
> from the server - but it still gets saved in the browser
cache.
Right.
> Eg. my url = page.asp?param=# (random number)
>
> The browser cache (Content.IE subdirectories) fill up
with
> files = page[1].html, page[2].html, page[3].html,....
Yup. Well, shoot. This question isn't something I can just
roll off
the top of my head, then. :-/ I should think that your HTML
header would
take care of that.
Are you appending the random number in your LoadVars method
calls? The
HTML page shouldn't be refreshing at all.
I know a few people I can ask for futher input, and I'll
report back to
this thread.
David Stiller
Adobe Community Expert
Dev blog,
http://www.quip.net/blog/
"Luck is the residue of good design."

Prolem with Cache-Control:max-age http header

Hello
It seems that safari do not take into account Cache-Control:max-age=31536000 http header.
Sending this header to the browser I would expect that safari will not ask the server for these resources before current date + one year.
It's the way IE and FireFox are working but safari is asking the server for these resources every time my html page is loaded (see http requests below).
Server returns a 304 status to indicate that the resource is not modified.
Does somebody have an idea about this strange behaviour?
I'm surprise that Safari do not respect RFC specifications.
Is there a settings to enable Cache-Control ?
Perhaps I forgot safari's specific headers..
Thanks
+GET 786+
GET /xtend/htmrsrc/LIB/XtendAjaxScripts.js HTTP/1.1
+RESP 786+
HTTP/1.1 200 OK
Server: Apache-Coyote/1.1
Last-Modified: Wed, 15 Oct 2008 13:25:24 GMT
*Cache-Control: PUBLIC, max-age=31536000, must-revalidate*
*Expires: Thu, 05 Nov 2009 13:09:10 GMT*
Content-Type: application/x-javascript;utf-8
Content-Length: 2856
Date: Wed, 05 Nov 2008 13:09:10 GMT
+GET 799+
GET /xtend/htmrsrc/LIB/XtendAjax.js HTTP/1.1
If-Modified-Since: Fri, 24 Oct 2008 07:59:24 GMT
+RESP 799+
HTTP/1.1 304 Not modifed
Server: Apache-Coyote/1.1
Date: Wed, 05 Nov 2008 13:11:19 GMT

This is a User to User forum, not a developer forum. You need to avail yourself of developer resources for this problem instead of posting them here.
Mulder

Cache-Control in OC4J

We had very typical problem in our web application.
We are using Oracle AppServer 10.1.2. on Sun Solaris with Web-Cache Enabled.
When we are trying to access the pages the response object contains multiple Cache-Control headers, though we have not explicitly added through our code. Can any one tell me how to delete the response headers through code or at server settings. I have tried with "reset()" but of no use.
Because of this cache problem we are not able to generate the reports but the same it working with Firefox browser.
Thanks in advance.
Kishore

It's unfortunate that JSPs running in WebLogic can't override the default Cache-Control directives in Web Server. That's probably a bug in the WebLogic plugin. (It is possible for JSPs running directly on Web Server to override the default Cache-Control directives.)
As with any obj.conf directive, you can configure Cache-Control directives on a path-by-path basis. For example, the following would set Cache-Control: no-cache for /foo/*.jsp and Cache-Control: private for all other URIs:<Object ppath="/foo/*.jsp">
PathCheck fn="set-cache-control" control="no-cache"
</Object>
<Object name="default">
PathCheck fn="set-cache-control" control="private"
</Object>Information on obj.conf syntax, including how to configure separate objects for separate paths, can be found in the Syntax and use of obj.conf chapter of the NSAPI Programmer's Guide at http://docs.sun.com/source/817-6252/npgobjcn.html.
I'm not sure what you mean by "what are the services handled by the web server and the the app-server and how they interact with each other". However, it's worth noting that Sun ONE Web Server 6.1 is fully capable of running JSPs by itself; there's no need for a separate WebLogic server.

Cache-Control problem

I don't really know if this is a Tomcat problem or a jsp problem... I have some java server pages with form components and when I hit the back button in a browser, the contents of a form disappear. I checked the response header with a perl script and it seems that there's always Cache-Control: no-cache and Pragma: No-cache in the header. I didn't put them there. I've tried to put some lines as
response.setHeader("Cache-Control","max-age=3600");
response.setHeader("Pragma","max-age=3600");
response.addHeader("Cache-Control","max-age=3600");
response.addHeader("Pragma","max-age=3600");
into my jsp, but they have no effect. I've tried disabling all filters, no effect. I've done a full text search on the whole tomcat directory tree with keywords like no-cache, cache-control and those words don't appear anywhere (but in my jsp). I suspected that apache could mess things up, but browsing the jsp's directly from tomcat (through port 8080) does the same.
Running out of ideas... Do you have any?
-Marko

It's neither. It's a browser problem... and perhaps your assumption that the browser has to remember what was in the form fields when you go back. Cache control has to do with caching the page, not form input anyway. I've never seen any header settings which tell instruct a browser what to do with form data after the form is submitted.
You could provide a back button on the form and have the JSP fill in the default values based on what's stored in the session, if you are storing it in the session. But if it's not a multipage form, there usually is no reason to be "going back" anyway, because the form is submitted and whatever's done with that data should be done by that point.
Tomcat could be defining default headers for anything in some config file.

Cache-control header

I have an authenticated webapp with a servlet that send information back to the client browser that is not particularly sensitive. As such, I'd like for the client to be able to cache the retrieved data for a reasonable amount of time.
Thus, I've added the following code to my servlet:
long expireTime = System.currentTimeMillis() + (7 * 24 * 3600 * 1000); // Cache for one week
response.setDateHeader("Expires", expireTime);
response.setHeader("Pragma", "cache");
response.setHeader("Cache-control", "public");While my expires header is indeed getting set to the date that I specify, AS7 is ignoring my Pragma header and sending two (!) Cache-control headers (as seen in a packet dump using ethereal):
Hypertext Transfer Protocol
    HTTP/1.1 200 OK\r\n
    Server: Sun-Java-System-Application-Server/7 2004Q2\r\n
    Date: Sat, 23 Apr 2005 01:30:15 GMT\r\n
    Content-type: message/rfc822\r\n
    Expires: Sat, 30 Apr 2005 01:30:15 GMT\r\n
    Pragma: No-cache\r\n
    Content-disposition: attachment;filename=msg145206-11461.eml\r\n
    Cache-control: no-cache\r\n
    Cache-control: public\r\n
    Transfer-Encoding: chunked\r\n
    \r\n
    HTTP chunked responseAm I doing something wrong, or is this a bug in AS7?
This is really causing a problem, because I want the browser to toss this data stream over to Outlook Express (the data is an e-mail message) but IE sees the no-cache header and refuses to write the file to disk, and thus, OE has no file to open.
Thanks,
Bill

Oh, BTW we believe this header modification is happening because we are setting a cookie and so WLS sees this and adds its own header. Still, we don't want WLS to do anything with the headers.

Wiki cache-control

I'm becoming confused by the settings for caching wiki pages and their elements.
Using the develop menu and Network Timeline window in safari I can follow the downloading of images, css, js files etc.
I recognise that the wiki page itself is set not to cache for obvious reasons of maintaining up-to-date copies of a page, but the other elements seem to sometimes be cached by my browser and at other times (i.e. currently) resolutely not cached.
The network timeline (currently) says that all the others files have their cache-control set to max-age = 0. Hence it is not surprising that my browser repeatedly downloads the files.
O.K. So the question is;
What sets this value? Presumably the wiki server ( although possibly my browser), but on what basis, how and can it be changed?
When I first started looking at this issue, a few weeks ago, I managed to arrive at a situation where almost all 'elements' were being successfully cached and page downloads were under 2 seconds. Currently It's up to over 6 seconds. I don't know if, or how, I've changed anything.
Can anyone offer any guidance or direction as to where I can find out more about how these settings are achieved?
Ta.

I realise that it is the weekend but although this post has prompted a reasonable number of views no responses, so I will offer a little more information about the situation in the hope of eliciting some advice...
I have edited the httpd_teams.config file to include the line
Header set Cache-Control "max-age=600001, private, must-revalidate"
and restarted Apache.
I then clear the cache in Safari, quit and restart.
On re-entering the URL of the wiki it loads a page in approximately 7 seconds. On inspecting the request and response header of one of the .css files, for example, the request makes no reference to cache-control but the response, correctly, contains the cache-control statement as set above.
However, when I navigate to another locaction and then return to the page the .css request contains max-age=0, ( with the response still correctly set).
WHY?
Just to make matters 'worse', some other files, particularly .png files for some reason, correctly retain the set max-age and use the cache as I intended.
Clearly, I am missing something. Does anyone have the slightest idea what or how to go about working it out?

Specific CACHE-CONTROL abilities?

This may be more of an actual server setting, but I thought I
would check and see if anyone came up with a way to do this through
straight CF coding.
On sites that require time-sensitive updates, we always use
the CFHEADER and CACHE-CONTROL settings ... it works very well, but
I am hoping to make this even more dynamic.
When you use cache-control in its default format, it causes
EVERYTHING on the page to not be cached and therefore reloaded.
What I am wondering is if there is a way to code CACHE-CONTROL so
it will still allow images to be cached, but not the actual HTML
page code. Reloading images all the time is not always necessary
and it would be nice to save bandwidth wherever possible.
Since caching is done by the browser, I am surprised there is
no way to specify what objects can be cached and what cannot with
these tags; so I am hoping I am just overlooking something.
Thanks in Advance.
IIS6:Win2003:CFMX7

This isn't really an answer, but you could try looking into
serving the images from a different domain and setting cache
headers on the web server, then for the page set different cache
headers that expire immediately. Untested, Untried and just
throwing it out there.
ie
http://images.mydomain.com
http://www.mydomain.com
I get the idea from Yahoo's YSlow plug in for firefox which
rates the page, and one of the ratings is for CDN (Content Delivery
Network), try googling that.
Sorry can't be of any more specific help.

Cache-control for browser in WL

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