On Mon, Jan 12, 2009 at 19:58, Nathan Potter <n...@opendap.org> wrote:
>
> On Jan 12, 2009, at 3:34 PM, Caldarale, Charles R wrote:
>
>> Don't think so. Does your code happen to call response.setStatus(200)
>> somewhere along the way?
>>
>> - Chuck
>
>
>
>
> Well at first I didn't think so, but now I am wondering....
>
> After adding some more instrumentation I have determined that I am
> inadvertently setting the status to 200.
>
>
> I was replicating the problem with this servlet:
>
> package opendap.experiments;
>
> import javax.servlet.http.HttpServlet;
> import javax.servlet.http.HttpServletResponse;
> import javax.servlet.http.HttpServletRequest;
>
> public class SendErrorTest extends HttpServlet {
>
> public void doGet(HttpServletRequest request,
> HttpServletResponse response) {
> try {
> System.out.println("Calling HttpServletResponse.sendError(404)");
> response.sendError(HttpServletResponse.SC_NOT_FOUND);
> System.out.println("HttpServletResponse.sendError(404)
> returned.");
>
> }
> catch (Exception e) {
> System.out.println(e.getMessage());
> }
> }
> }
>
>
> And a simple document service servlet:
>
> <servlet-mapping>
> <servlet-name>docs</servlet-name>
> <url-pattern>/docs/*</url-pattern>
> </servlet-mapping>
>
> With this error-page:
>
> <error-page>
> <error-code>404</error-code>
> <location>/docs/error404.html</location>
> </error-page>
>
>
> I added some instrumentation and looked at the logs and saw that when the
> sendError() method is called in the SendErrorTest servlet the call returns
> immediately. And is followed by a the docs servlet receiving a request for
> the error document, which since it is successfully returning a document sets
> the HTTP status to 200.
>
> Is sendError() using a redirect?
>
> Is there a way to set the value of the <location> element in the error-page
> declaration so that tomcat just grabs the file from the context directory?
>
> The java servlet spec (2.4) says:
>
> "If the sendError method is called on the response, the container consults
> the
> list of error page declarations for the Web application that use the
> status-code
> syntax and attempts a match. If there is a match, the container returns the
> resource
> as indicated by the location entry."
>
> So what does "the container returns the resource as indicated by the
> location entry" mean for tomcat?
>
>
> Is there an example of a design pattern you can point me to?
>
> Thanks,
>
> Nathan
It sounds like error404.html isn't a plain HTML file, but a page
that's generated by a servlet. Is that right? If so, the servlet
should not set the status to 200 for an error page - it should leave
the error status alone. Maybe you need a different version of the
servlet to handle error pages, or maybe your error pages should just
be static HTML files.
--
Len
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