SSL image cache

Hi,
I have made an jsf web app using ssl.Now i'm testing the app on a real server and i have seen that my content loads much faster then the images.They are several small icons and table corners around 4 Kilo.
Is any way to cache the images in the browser on a ssl connection.
Or is any way to load (preload) all the page before showing it.
Regards,
Iulian

Hi Tim,
In the cache document it mentions other logic besides the expires date that is referenced when deciding to get an image from the server. When building a theme most place their theme images on the file system and avoid the overhead of getting the image from the database. Pulling images from the file system is what all other non-dynamic web applications do. This also makes sense as theme images are not associated with records so there is no need to go to the database... The disadvantages of not having your theme images in the database is that it is more of a hassle for you to distribute your application to production as there are many files to move...
Try a test of monitoring the http traffic from your client to see how often and when your browser makes an http request for and image from a server. A good tool for this is Firefox and the add-in Firebug. Once installed you can see the network traffic under the "Net" tab. Try viewing http requests made against an APEX app you'll see that the browser frequently uses the cached version of images "pulled from the file server". Of course if you do a manually refresh of a page by clicking the refresh button or pressing F5 you'll get all content pulled from the server again for that page.
Another test if you have Apache is you can view the access log as files are requested. Useful command on Unix to view the end of the file as records are written is:
tail -f <your access log file name here>
For your traffic tests with Firebug you can use the packaged APEX applications developed by the APEX team.
http://www.oracle.com/technology/products/database/application_express/packaged_apps/packaged_apps.html#PACKAGED
Todd

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Hi,
I'd like to cache all my images to save page rendering time and bandwidth because my images are all static and never change.
I use the John Scott's caching technique Link: [http://jes.blogs.shellprompt.net/2007/05/18/apex-delivering-pages-in-3-seconds-or-less/], in a few words this technique consists of adding a header line "Expires: date in the future" in the http response.
It works very well in IE, the images are cached and the same image can be accessed several times (within the same session or in different sessions) without issuing an http request to the server each time.
with Firefox it does not work, the same image is asked again and again to the server (i'm using FF 3.5 and APEX 3.2).
- Is it a date format problem? no, because when i type about:cache in FF, i can find my image in the cache with an expire date in the future.
The weird thing here is that the counter is incremented each time u request the image, so FF knows it is in the cache and even if the expire date is in the future, FF asks it again to the server.
- Is it a FF bug? If u read the http specs or if u google a little, u can come to the conclusion that FF does not follow the standards,
but... images.google.com for example manages to get its images cached with FF.
They use an http response header "cache-control: public, max-age=604800".
I tried the same and all kinds of combinations but without success.
When i compare my image with the one from google in the FF cache, they both have the same attributes.
- It's not an apex issue neither because it works with IE, most probably an incompatibility between apex and FF?
Maybe the use of cookie? or the http request (not the response) containing "cache-control: max-age=0"?
I've found so far 2 half solutions:
1) use ETag and modified date, see the Tyler Muth's note Link: [http://tylermuth.wordpress.com/2008/02/04/image-caching-in-plsql-applications/].
with this technique FF continues to send request each time but the answer is shorter because it's just a "304 not modified" instead of "200 OK" (200 response is bigger as it contains the image).
it's better than nothing but you still have 1 request + 1 response for nothing.
Another problem is that you need SYS access to implement this, which is not possible on an hosted server. (note that for images from the file system it is already foreseen by apex 3.1, Tyler's note is for images from the db)
2) if you preload the image (using myimage=new Image();myimage.src='...';), then there is max 1 request per browser session.
There are 2 minor issues here:
- no caching across sessions
- if u don't want to preload all the images (example a page with lots of thumbnails, when user clicks it show a bigger image, in that case the thumbnails can be preloaded but overkill for the big images), then you need to load the image, wait until the image has loaded before displaying it, it does not slow down the execution, but requires some extra JS.
I'm not asking anyone to investigate it, i can live with the 2 workarounds,
but just in case someone encountered the same problem and already fixed it.
Let me know if u managed to use the John Scott's technique with Firefox. (U can use Firebug to see the http traffic)
Thx
Tim

Hi Anshul, hope these help. Let me know if you need to see anything else.
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Messages Opening Image Cache Folder when Sending Files

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Hi,
I don't have an answer for this one.
Are you finding those items are zipped before Sending ?
Where are they from?
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How to disable image cache in Mail 7

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Mail 7 displays the same image in every mail until I restart it, it obviously displays a cached file instead of the original image.
Where is the Mail-cache-file? Can I writeprotect it?

I think Private Browsing might be what you are looking for,
have a look here for more info
[https://support.mozilla.com/en-US/kb/Private%20Browsing]
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Web template image cache

goodmorning everybody,
does anybody know where I can clear the image cache when running a web template.. It keeps displaying the old image even though I replaced the image with a new one in the mime repository...

hi Joris,
try
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oss note 456068
Mime Repository Icons
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Hi
I'm trying to implement Image Caching on an Oracle XE database following Tyler Muth's blog post http://tylermuth.wordpress.com/tag/oracle-plsql-images-caching/
Has anyone managed to implement this successfully?
I've run the following as sys :
begin
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Sara

Bump.
Has anyone managed to implement this successfully? Is there anything I can check? Or is this a bug with the EPG?
This is causing us massive problems and I can't see what I've done wrong. Any help is really appreciated.
Thanks
Sara

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Hi there,
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Should not turning off keepAlive disable the use of persistent sessions?
Thanks.
Yan

They are unrelated features.
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Hi Scott,
I had the same with my website an I did the following ...
* Trash the whole Safari cache folder ... empty trash
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Dimaxum

Blog: Image Caching in PL/SQL Applications

Blog: Image Caching in PL/SQL Applications
http://tylermuth.wordpress.com/2008/02/04/image-caching-in-plsql-applications/
Enjoy,
Tyler

Anyone? Or is it the wrong forum?
Alessandro

How do I clear Dreamweaver CS6 image cache (on Mac)?

Hi,
I have updated a remote image (absolute link) but it doesn't update in DW (CS6). How do I clear the image cache?

Go to Site menu > Advanced > Recreate Site Cache, and see if that helps.

SSL Session cache persistence

Hello,
I've been scratching my head for while on a problem concerning SSL session caching. Upon examining memory usage of the session cache I noticed that the number of cached sessions is reset at some point while new session are created. For example sometimes at around 300 -1500 sessions the number drops to under 10. I have set the session cache size to unlimited (via SSLSessionContext.setSessionCacheSize()) and session timeout to 24 hours (via setSessionTimeout()).
I noticed that this has probably something to do with garbage collection. I made a server application that receives SSL connections and every few seconds prints the number sessions in the cache and the amount of consumed memory (in megs). I also enabled garbace collection information printing and ran java VM with a maximum heap size of 512M. I ran a client application against it that continuously initializes a new sessions. Here's what I got:
Sessions: 484     Memory: 1.7913589477539062
[GC [DefNew: 503K->4K(576K), 0.0007350 secs] 2234K->1734K(3796K), 0.0008700 secs]
[GC [DefNew: 513K->63K(576K), 0.0009260 secs] 2243K->1793K(3796K), 0.0010680 secs]
Sessions: 490     Memory: 1.7832870483398438
[GC [DefNew: 569K->37K(576K), 0.0021150 secs] 2299K->1773K(3796K), 0.0022560 secs]
Sessions: 495     Memory: 2.1244659423828125
[GC [DefNew: 543K->37K(576K), 0.0019000 secs] 2279K->1775K(3796K), 0.0034750 secs]
[GC [DefNew: 549K->57K(576K), 0.0009080 secs] 2287K->1796K(3796K), 0.0010290 secs]
[Full GC [Tenured: 1739K->1635K(3220K), 0.0865340 secs] 1962K->1635K(3796K), [Perm : 3267K->3267K(8192K)], 0.0885000 secs]
Sessions: 6     Memory: 1.7752304077148438
[GC [DefNew: 512K->58K(576K), 0.0016310 secs] 2147K->1694K(3796K), 0.0017680 secs]
[GC [DefNew: 568K->37K(576K), 0.0009750 secs] 2204K->1678K(3796K), 0.0011110 secs]
Sessions: 12     Memory: 1.7010269165039062
[GC [DefNew: 549K->56K(576K), 0.0014310 secs] 2190K->1699K(3796K), 0.0015600 secs]Notice how the number of sessions drops from 495 to 6? And in between there's a garbage collection print "[Full GC...". Why is this? Shouldn't the session cache keep the sessions until there's either too many of the them or they get too old? Here only a few minutes have elapsed and memory consumption is under control (1 to 3 megs).

In my implementation I avoid session renegotiation as
much as possible to achieve high throughput. My goal
is to preserve sessions for the entire session
timeout time. This raises a few questions:Understood, but you also have to protect the server against resource exhaustion. It's in the client's interest to cache lots of sessions for a long time; the server's interest is to conserve resources so it can keep itself running.
You actually don't want to cache all the sessions, just the 'hot' ones, so you're better off having the SessionContext remove sessions on an LRU basis by having a finite limit, rather than just letting them be GC'd. The fact that so many sessions were collected in your runs indicates pretty severe memory usage.
(1) Is there any way to tweak this behavior? For
example can make the sessions live longer by using
some GC flags for the VM? Allocate more heap space, or cache fewer sessions.
(2) How about keeping regular references to all the
sessions in my application?That would save them from GC of course. But then you'll quickly discover that you really do need a finite limit.
(3) Is the behavior of the session cache or the inner
workings of the SSL API in general documented
somewhere?Only in the source code of JSSE, and that's only a property of Sun's JRE implementation. Session caching is not even a required feature, and J2ME implementations for example generally don't do it at all.

Clear Image Cache

hi ,
in my application i have to cache the image to some extend..
and that i need to clear the image cache as my url dont
change.
is there anyway programatically i can refresh the image ?
thanks

"sohilr" <[email protected]> wrote in
message
news:ghts86$ls8$[email protected]..
> hi ,
> in my application i have to cache the image to some
extend..
> and that i need to clear the image cache as my url dont
change.
> is there anyway programatically i can refresh the image
> thanks
http://www.magnoliamultimedia.com/flex_examples/Amys_Flex_FAQ.pdf
Q7

After Effects clear images cache programmatically?

hi,
i'm currently developing an AE effect plugin.
i want to be able to clear the cache programmatically
from my effect plugin code.
is there any way to do this?
thanks in advance!

Hi,
May I ask why you need to clear image cache from your effect plug-in?
It may be a bug (either in Plug-in or AE) if you need to do so for some reason.
I can read Japanese, if you prefer to use Japanese.
Thanks,
-keiko

SSL image cache

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