Hey John,
Tomcat does not do any caching. Try adding these HTTP headers:
response.addHeader("Pragma","no-cache"); // HTTP/1.0
response.addHeader("Cache-control","no-cache, no-store"); // HTTP/1.1
That's the official way. However, due to an IE4-IE6 bug, you might want to
replace the second one by:
response.setHeader("Cache-control","max-age=0"); // HTTP/1.1
More info see: http://forum.java.sun.com/thread.jspa?threadID=233446&start=0
Worked fine for me!
Regards,
Paul Hamer
management & development
[EMAIL PROTECTED]
toHAVE websolutions
www.tohave.nl
[EMAIL PROTECTED]
> -----Original Message-----
> From: John Mok [mailto:[EMAIL PROTECTED]
> Sent: Sunday, 01 October 2006 02:46
> To: [email protected]
> Subject: HOWTO disable Tomcat from caching dynamic picture
>
> Hi,
>
> I am using Tomcat 5.5.17 with Sun JDK 5.0 Update 7 on CentOS
> 4.3. I have
> a servlet, namely BMPImageViewer, which retrieves a BMP image from
> database with conversion into PNG format via JAI. The servlet is
> referenced in XSL-FO for PDF generation.
>
> My problem was that the image did not change even the image
> in database
> updated. I checked that the servlet BMPImageViewer worked
> correctly and
> loaded the correct image every time. The servlet outputs the
> image with
> header set to "no-cache" :-
>
> response.setHeader("Pragma", "no-cache");
> response.setHeader("Expires", -1);
>
> How to force Tomcat not to cache the dynamic image? and load
> a new one
> every time? I hope someone could help me out and advise how
> to configure
> Tomcat not to cache dynamic image.
>
> Thanks a lot.
>
> John Mok
>
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