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Thread: Caching prevention

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  1. #1
    Join Date
    Nov 2002
    Posts
    8

    Caching prevention

    Hi all

    I need some help with the following:

    I have a JAVA applet on page, which I don't want to be cached by browser.
    Is there any possibility how to tell the browser not to cache an applet (I mean a property of the <applet> tag, ets.) ?

    The html page the applet is used on, does have following meta tags setting:
    <META HTTP-EQUIV="Expires" CONTENT="0">
    <META http-equiv="Pragma" content="no-cache">
    <META http-equiv="Cache-Control" content="no-cache">

    so the html file itself is not cached, but when I call:

    <applet name='test' archive="../class/test.jar" ...>

    the test.jar file is always cached.

    Can anybody help me, how to prevent the caching of the .jar file ?

    Thank you.

    Regards,
    Marek Mahdal
    Slovakia

  2. #2
    Join Date
    Nov 2002
    Location
    Baltimore, Maryland
    Posts
    12,279
    You cannot keep browsers from caching anything. You can ask but they won't always comply. For non-HTML files you need to adjust the HTTP header that your server pre-pends to the file. If you just want to avoid the possibility of browsers not downloading the newest version of your applet then send a really old date or set the date to '0'. And know that anything that you might want to put in an HTTP-EQUIV META element, you can put in the HTTP header.

  3. #3
    Join Date
    Nov 2002
    Posts
    8
    Thank you

    Do you know how do I pre-pend a header to .jar file-type in Apache ? Is there a Apache module for it, ro do I have to programm one ?

  4. #4
    Join Date
    Nov 2002
    Location
    Baltimore, Maryland
    Posts
    12,279
    I don't know how to that actually, but I do know that, above, I should have written 'Expires' where I wrote 'Date'.

  5. #5
    Join Date
    Nov 2002
    Posts
    8
    Thanks
    I found the Apache Module. You can find the description at
    http://httpd.apache.org/docs/mod/mod_expires.html.

    Marek

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