Question

I am getting old file from the server

Asked by: globalnest

Tools Used :
Websphere Application Server 6.0
AS/400 v5r4
DB2 UDB

I am working on the web project which includes the reports to be generated in pdf format.
I am using RPG ILE programm to generate the report, which generates the real time report
and over write it into a specific folder (Library on AS/400) .  Users access these files using
a jsp page with the help of various links to these pdf reports.  
The first report generated can be fetched by user correctly. However, when user clicks the link with other searh parameters, it shows same old pdf file while the file on server is ovr written by the program. 

if(response != null && ! response.isCommitted())  
	{
		response.setHeader("Pragma","no-cache");   
		response.setHeader("Cache-Control","no-store");   
		response.setHeader("Expires","0");   
		response.setDateHeader("Expires",-1);   
	}

                                  
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Asked On
2009-08-06 at 23:52:31ID24633982
Tags

JSP

,

Servlet

,

Websphere Application Server

Topics

Java Server Pages (JSP)

,

Java Servlets

Participating Experts
2
Points
500
Comments
7

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Answers

 

by: jwentingPosted on 2009-08-07 at 00:06:46ID: 25040417

Most likely there's a caching proxy in the middle that ignores your no-cache parameters.
We've had that problem in the past, the only way to ensure it won't happen is to have the returned file have a different name each time.
That can be achieved by including a timestamp in the filename (for example).

Also you can try to set the expiry headers to the exact system time (use GMT). That might be accepted by servers that refuse to acknowledge 0 or -1.

 

by: TimYatesPosted on 2009-08-07 at 01:54:30ID: 25040880

Instead of putting the timestamp in the filename, just add it as another URL parameter ie:

/download?file=YourFile.pdf&t=3494723947924

But jwenting is right :-)

 

by: globalnestPosted on 2009-08-07 at 05:58:53ID: 25042172

Hello jwenting and TimYates,

Thank you for yor time.

I have restriction about the file name , so can not  change it.
I have changed the expiry headers to exact system time and also
added a query string parameter as the time instance so that the
letters in the query string will always change. However, the problem
still persist.

Thank you again for your time.

Rahul Ashar.

 

by: jwentingPosted on 2009-08-07 at 06:42:53ID: 25042562

try one more thing: clear the browser cache and try again. If you're now getting a new file it's the browser, not some proxy or appserver.

btw., are you using some caching solution in your application? Either implicitly or explicitly that might be the reason.
For example, I used to maintain a web application that created stock charts. It used a servlet filter to cache outgoing charts and retrieve from cache charts it knew about.
Saved a lot of CPU time and database operations, but required some careful configuration to avoid caching things for too long as different charts might be valid for anything from under a minute to over a day.

 

by: globalnestPosted on 2009-08-07 at 07:39:53ID: 25043174

Hi jwenting,

After clearing the catche (browser'sold fiels ) it shows the new file.
I have a list of different reports generated at  single click.
and the general trend of user is that they need to go thr' all the
reports. So. I can not ask user to close or clear the browser before
clicking each link.

Rahul
 

 

by: jwentingPosted on 2009-08-10 at 04:24:48ID: 25058832

so the browser is caching things it shouldn't. Not unheard of. Just about your only option is to have the generated content have a different filename each time.

 

by: globalnestPosted on 2009-08-12 at 06:14:55ID: 31614757

Hello guys,

I am sorry for this late reply.

I have done a very stupid thing to get it worked. I am  sure that what I have done is theoritically not a good idea (complete non sense , but works).  
I have used the timestamp as first parameter  in the
query string and filename as second.  e.g.
download?t=3494723947924&file=YourFile.pdf

I am surprised to see that it started working as easy  as a mentioned above by TimYates. (I am aware that the query string sequence should not matter, but I got my solutions).  The headers set with an exact expiery time worked fine on IE7.  

It worked for other parts of the web application where the previous page histiry should be eliminated.

Thank you very much.

Rahul Ashar
GN Solutions Pvt Ltd.

20120131-EE-VQP-002

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