asked on

How can I debug a download from a jsp.

Hi All,

I have a problem with my jsp. For some reason the download mechanism has broken and I can't find any tools that will help me track the problem. It has not been tested recently so I can't track down the code change that caused it to break.

if (params.packed) {
        // Save Report stuff
        String fileExtension = ".html";
        if (params.xls) {
          response.setContentType("application/plain");
          fileExtension = ".xls";
        }
        final String fileMid;
        if (params.automatic) {
          fileMid = "." + DateFormatter.toSavedReportsDatetime(params.now);
        }
        else {
          fileMid = "_" + DateFormatter.toFilenameYYYY_MM_DD_HH_MM_SS(params.now);
        }
        Log.logln("setHeader: attachment; filename=\"" + reportName + fileMid + fileExtension+"\"");
        response.setHeader("Content-Disposition", "attachment; filename=\"" + reportName + fileMid + fileExtension+"\"");
        Log.logln("setHeader: done");
      }

Open in new window

The attached code is the critical bit. params.packed will be set if a download is requested, params.xls requests xls format. This all should (I believe) work but it doesn't. No file dialog pops up, it just redisplays the report.

Is there a trick in FireBug I can use to inspect the "Content-Disposition" or something?

Paul

Gurvinder Pal Singh

check this on how to set the content-type
http://www.jguru.com/faq/view.jsp?EID=1307284
http://www.devx.com/Java/Article/31356/0/page/3
https://www.experts-exchange.com/questions/22152089/A-servlet-to-output-a-xls-file.html

PaulCaswell

ASKER

RE: jguru link:

I have tried contentType of "application/vnd.ms-excel" and it still does not work. "application/plain" has worked in the past.

RE: devx link:

Sorry - site is broken for me. What does it suggest?

RE: Q_22152089

I am not using HSSF so that suggestion is not my issue - however, I did add:

response.setHeader("Cache-Control", "public");
response.setHeader("Pragma", "public");
response.setHeader("Expires", "0");

and changed:

response.setHeader("Content-Disposition",...

to

response.setHeader("Content-disposition",...

and that does not solve the problem.

Paul

Gurvinder Pal Singh

you can use firebug to check the response headers

PaulCaswell

ASKER

I'm not at work at the moment so I can't check but my thoughts were that this should be a server-side issue shouldn't it?

If the Content-Disposition is acted on at the client side then certainly I can check the Response headers. What should I look for?

NB: The jsp is a target of a forward (as opposed to a redirect). Could that be my issue?

Paul

ASKER CERTIFIED SOLUTION

PaulCaswell

membership

This solution is only available to members.

To access this solution, you must be a member of Experts Exchange.

Start Free Trial

rrz

Please see tip 2 at
http://www.oreillynet.com/pub/a/oreilly/java/news/jsptips_1100.html

PaulCaswell

ASKER

I found the answer.