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From "Martin Gainty" <mgai...@hotmail.com>
Subject Re: Possible to send 503 status over JK?
Date Wed, 26 Jul 2006 13:30:14 GMT
From what I see without some sort of firewall or BigIP interceptor
The best solution is a Tomcat valve 
In this way Tomcat can detect *longer than unexpected* connect errors

M-
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----- Original Message ----- 
From: "Len Popp" <len.popp@gmail.com>
To: "Tomcat Users List" <users@tomcat.apache.org>
Sent: Wednesday, July 26, 2006 9:21 AM
Subject: Re: Possible to send 503 status over JK?


> I'm not sure why it works that way. I guess the idea is that if Tomcat
> has generated an error page, Apache shouldn't mess with it.
> 
> When Tomcat is down the situation is different - the error comes from
> Apache (mod_jk), not Tomcat, so Apache is reponsible for the status
> code and error page.
> -- 
> Len
> 
> On 7/26/06, Rick G <tomcatdev@vidyah.com> wrote:
>> Hi Len,
>>    On your comments, I totally understand that you can't override the tomcat
>> 503 error page in a standalone Tomcat set up, especially from a webapp that
>> isn't running. However, can you explain ...
>>
>> > As long as Tomcat is running, the situation is the same as above.
>> > JK and Apache pass Tomcat's error pages and status codes back
>> > unchanged.  ErrorDocument declarations do not override Tomcat's
>> > error pages.
>>
>> I don't understand why Apache can't override it if it has the right status
>> code, isn't that the whole point of having a status code handler in
>> httpd.conf?  Just seems that if Apache can handle the 503 with Tomcat down,
>> that it shouldn't work any different with Tomcat running but with a webapp
>> down, as long as if its returning the same status code.
>>
>> Thank you much for your feedback,
>>
>> Rick
>>
>> -----Original Message-----
>> From: Len Popp [mailto:len.popp@gmail.com]
>> Posted At: Tuesday, July 25, 2006 6:26 PM
>> Posted To: Tomcat Dev
>> Conversation: Possible to send 503 status over JK?
>> Subject: Re: Possible to send 503 status over JK?
>>
>>
>> The recent messages on this topic have confused me, so I've spent part of my
>> evening running some tests.
>> =========
>> First, with Tomcat standalone:
>>
>> Tomcat's default error pages can be overridden by an error-page declaration
>> in the webapp's web.xml. If there is no error-page declared, Tomcat uses its
>> default error page; it does *not* fall back to a "global" error page
>> declared in the ROOT webapp.
>>
>> When a webapp is stopped, its error pages are not executed (obviously), so
>> Tomcat's default error pages are used.
>>
>> Therefore it is not possible to override the 503 page when the webapp is
>> stopped. Tomcat always uses its default page.
>>
>> In any case, the correct HTTP status code is returned to the browser.
>> =========
>> With Tomcat behind Apache and mod_jk:
>>
>> As long as Tomcat is running, the situation is the same as above. JK and
>> Apache pass Tomcat's error pages and status codes back unchanged.
>> ErrorDocument declarations do not override Tomcat's error pages.
>>
>> When Tomcat is down (not just one webapp stopped, but Tomcat not running at
>> all), you obviously don't get a Tomcat error page. Apache generates the 503
>> error and uses its own error page. This page can be overridden by
>> ErrorDocument.
>>
>> Again, the correct HTTP status codes are returned to the browser.
>>
>> So, you can use a custom ErrorDocument to return a "Site Down" message if
>> Tomcat is down completely, but not if a webapp inside Tomcat is stopped.
>>
>> These tests were done with Tomcat 5.5.17, Apache 2.0.55, JK 1.2.15.
>> --
>> Len
>>
>> On 7/25/06, Hassan Schroeder <hassan.schroeder@gmail.com> wrote:
>> > On 7/25/06, Rick G <tomcatdev@vidyah.com> wrote:
>> >
>> > > The 500 is caught correctly, but I always end up seeing the tomcat
>> > > generated error page for a 503.
>> > > I guess this could be a mod_jk or apache issue if you are saying
>> > > that tomcat is sending the right status code.
>> > >
>> > > Questions:
>> > >  what version of tomcat you running?
>> >
>> > that quick test was on 5.5.17 standalone just to confirm the correct
>> > http header was being sent.
>> >
>> > --
>> > Hassan Schroeder ------------------------ hassan.schroeder@gmail.com
>> >
>> > ---------------------------------------------------------------------
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>> >
>> >
>>
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>>
>>
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>>
> 
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