Sorry for the spam, but it might be significant to know what
versions of stuff I'm using.
Tomcat 3.2.3
Apache 1.3.19
jdk1.3.1
Windows NT SP6a (although I believe in the distant past
I verified this issue on Solaris as well)
Using mod_jserv, not mod_jk as the connector
These versions, and the use of mod_jserv are required by
the java application I'm developing with (according to
its documentation).
I notice that this problem DOES NOT occur if I replace mod_jserv
with mod_jk. So, I just need to know if there is a solution that
works for mod_jserv (ideally the solution will be some
different usage of the java methods & objects on the servlet
or JSP side).
Thanks again.
Bill Neuman wrote:
>
> Oops - I tried to use Hotmail to post because my primary ISP's mail
> server is down, and it mangled my JSP page. So I'll repeat the
> question...
>
> All,
>
> This is a question that has been repeated several times on this mailing
> list, but as far as I can tell never answered.
>
> I have a long back-end process during which I want to return interim
> results to the browser. With a JSP, the standard way to do this seems
> to be to use out.flush() at any point where I want to return partial
> results. This works great when I browse Tomcat's own web server
> (port 8080), but when I browse the same page served through Apache
> (port 80 for me) and serviced by Tomcat, the results all appear at
> once, rather than as I flush() them.
>
> So, it appears Apache is adding some level of response buffering that
> I'm not asking it to do. Does anybody know how to make this work.
>
> Below is the code for a jsp page that demonstrates the issue--all help
> is appreciated.
>
> ---BEGIN CODE---
> <%@page language="java" session="false"%>
>
> <html>
> <head><title>Delaying</title></head>
> <body>
> <h2>Delaying...</h2>
> The following lines should appear at approx.1 second intervals.
> When served through Tomcat's own server (i.e. 8080) it works.
> When served through Apache using Tomcat as the handler, the page all
> appears at once after an approx. 5 second delay.
> <p>
> <%
> out.flush();
>
> long delay = 1000;
> long start = System.currentTimeMillis();
>
> for (int ii = 1; ii < 6; ii++) {
> while (System.currentTimeMillis() < start + delay) {
> }
> start = System.currentTimeMillis();
> %>
> Delayed a total of <%= ii %> intervals. Pretend this is a
> message giving status on task execution in a long string of
> tasks.<br>
>
> <%
> System.out.print(" ii=" + ii + "; ");
> out.flush();
> }
>
> System.out.println("");
> %>
> </body>
> </html>
> ---END CODE---
>
> P.S. I've also tried request.flushBuffer() based on responses
> to one of the previous questions about this, but that is even
> worse--if I use it, the "chunked" behavior doesn't even
> work when browsing Tomcat's own web server.
>
> Regards,
> Bill Neuman
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