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From kharp...@oreillyauto.com
Subject Re: Modify HTTP status returned by stopped context
Date Fri, 15 Jun 2012 16:30:36 GMT
Mark,

I attempted to do what you prescribed but I am running into a snag and
can't figure out what I've done incorrectly.

I have a context, we'll call it /foo

In my ROOT web application (/) I created a servlet with a mapping of /foo/*
like so:
<servlet>
  <servlet-name>foo-404-change</servlet-name>

<servlet-class>org.apache.catalina.servlets.DefaultServlet</servlet-class>
  <load-on-startup>1</load-on-startup>
</servlet>

<servlet-mapping>
  <servlet-name>foo-404-change</servlet-name>
  <url-pattern>/foo/*</url-pattern>
</servlet-mapping>

The above configuration loads fine (servlet starts up no problem).

I've created a simple JSP to respond with a 503.  We'll call it
change-status.jsp.  If I call this page, it works fine.  However, when I
stop the context /foo, and attempt to reach /foo/whatever, I still get a
404 as if my servlet isn't even trying to handle the request.

I thought maybe I needed to specify an error page so that ROOT would know
what to do with a 404, so I setup the following in the ROOT web app's
web.xml:
<error-page>
  <error-code>404</error-code>
  <location>/change-status.jsp</location>
</error-page>

If I go to http://myserver:8080/not-a-real-page" the 404 triggers the
location specified, and my JSP correctly returns a blank page with an HTTP
status of 503.

If I go to http://myserver:8080/foo/not-a-real-page" while the context /foo
is running, I get a 404 as expected.

If I go to http://myserver:8080/foo/some-other-fake-page" while the
context /foo is stopped, I still just get a 404.

I'm not sure where to go from here, and would greatly appreciate any ideas
you (or anyone else) have.

Thanks,
Kyle Harper




From:	Mark Thomas <markt@apache.org>
To:	Tomcat Users List <users@tomcat.apache.org>
Date:	06/14/2012 03:19 PM
Subject:	Re: Modify HTTP status returned by stopped context



On 14/06/2012 20:37, kharper2@oreillyauto.com wrote:
>
> Hello,
>
> I am running multiple web applications on a tomcat server.  When a
request
> to a context in the stopped state is made, tomcat is returning 404 "not
> found" rather than 503 "unavailable".  Is it possible to change this
> behavior in any way?  Obviously I can't just modify _all_ HTTP 404
> responses to 503.  Just those which are coming from a context in the
> stopped state.

Assume the context in question is /foo

In the ROOT web application add a servlet with a mapping of /foo/*

The servlet should just return a 503 (or any other error code)

This works because the mapping rules require the longest match to the
context be considered first. While /foo is running, requests will be
mapped to the /foo context and the servlet in the ROOT web application
is ignored. When /foo is not running, the request is mapped to the
servlet in the ROOT web app.

This obviously won't work for stopping the ROOT web app.

HTH,

Mark

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