service() method called Twice when using creating response with MIME type application/x-shockwave-flash

[Andrew Milkowski <am...@unicast.com>]

Using Apache Tomcat/4.1.12 deployment, following sample code in the servlet
used to demonstrate this behavior

public void service (HttpServletRequest request, HttpServletResponse
response) throws ServletException, IOException {

	final BufferedOutputStream bufferedOutputStream = new
BufferedOutputStream(response.getOutputStream(), 2048);

	..
	..
	..

	response.setContentType("application/x-shockwave-flash");

	schart.encodeAsSWF(bufferedOutputStream);  // (schart here is a carting
package that encodes swf file into the OutputStream)


	response.setHeader("Expires", "-1");
	response.setHeader("nPragma", "no-cache");

	bufferedOutputStream.flush();
	bufferedOutputStream.close();

	response.flushBuffer();
}

in the above service method gets called twice, before rendering browser
output with the Flash MIME content!

Did anyone here had a similar experience? (maybe not necessarily with a
application/x-shockwave-flash) where service
method is called twice before completing response..

Any suggestions/solutions greatly appreciated!


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Re: service() method called Twice when using creating response with MIME type application/x-shockwave-flash

[Bill Barker <wb...@wilshire.com>]

I don't personally use flash, but yes, the Adobe Acrobat plugin for MSIE
does much the same thing.  This is partially due to the fact that the
Flash/Adobe plugin wants to try and stream the content (by sending a
'Content-Range' header), and partially due to the fact that MSIE is totally
brain-dead when it comes to plugins.

The first move is to try and support 'Content-Range' in your Servlet.
You'll still get multiple requests, but hopefully it won't cost as much.  If
this isn't practical for your application, and the data isn't too big, you
could try caching the data in the session so that re-generating doesn't cost
too much.

"Andrew Milkowski" <am...@unicast.com> wrote in message
news:BDEHIHNJKNJKHALOJOEIGEKBCLAA.amilkowski@unicast.com...
> Using Apache Tomcat/4.1.12 deployment, following sample code in the
servlet
> used to demonstrate this behavior
>
> public void service (HttpServletRequest request, HttpServletResponse
> response) throws ServletException, IOException {
>
> final BufferedOutputStream bufferedOutputStream = new
> BufferedOutputStream(response.getOutputStream(), 2048);
>
> ..
> ..
> ..
>
> response.setContentType("application/x-shockwave-flash");
>
> schart.encodeAsSWF(bufferedOutputStream);  // (schart here is a carting
> package that encodes swf file into the OutputStream)
>
>
> response.setHeader("Expires", "-1");
> response.setHeader("nPragma", "no-cache");
>
> bufferedOutputStream.flush();
> bufferedOutputStream.close();
>
> response.flushBuffer();
> }
>
> in the above service method gets called twice, before rendering browser
> output with the Flash MIME content!
>
> Did anyone here had a similar experience? (maybe not necessarily with a
> application/x-shockwave-flash) where service
> method is called twice before completing response..
>
> Any suggestions/solutions greatly appreciated!





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