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From Velmurugan Dhakshnamoorthy <dvel....@gmail.com>
Subject Re: [users@httpd] Reg: Custom error message at Apache 2.4.25
Date Mon, 17 Apr 2017 22:56:11 GMT
Thanks again for your valuable inputs,  I am actually restricting number of
HTTP sessions at weblogic layer,  beyond the specified limit,  weblogic
throws 500 error message,  which is not very useful to users,  I want only
the 500 error page to be re-written by Apache proxy with simple message
(ex: server is busy,  login after sometime), I want only 500 generic error
message to re-write,  I don't want to re-write any other content from
back-end server.

Regards,
Vel

On Apr 18, 2017 00:19, "Luca Toscano" <toscano.luca@gmail.com> wrote:

> Hi!
>
> As Nick mentioned there are a couple of options:
>
> 1) https://httpd.apache.org/docs/2.4/mod/mod_substitute.html or
> https://httpd.apache.org/docs/current/mod/mod_proxy_html.html in case you
> want to replace some parts of the response coming from the backend with
> your content.
>
> 2) Write your own content output filter to modify the backend response as
> you wish before flushing it out to the client. I'd suggest to follow
> https://httpd.apache.org/docs/2.4/mod/mod_lua.html#modifying_buckets if
> you want to attempt this road since using Lua instead of C is generally
> easier for people not used to write Apache code.
>
> My personal suggestion is to not use any of the above but to re-think
> about why you want to force the proxy to do this work. A proxy should be as
> lightweight as possible and ideally should mask backend failures with
> pre-defined error pages.
>
> Hope that helps!
>
> Luca
>
> 2017-04-17 9:57 GMT+02:00 Velmurugan Dhakshnamoorthy <dvel.hex@gmail.com>:
>
>> Hi Nick,
>> yes exactly,  I want the error message produced by back-end weblogic
>> server to be re-written by Apache proxy and then display custom message to
>> user.
>>
>> Regards,
>> Vel
>>
>>
>> On Apr 17, 2017 15:34, "Nick Kew" <niq@apache.org> wrote:
>>
>> On Mon, 2017-04-17 at 09:04 +0800, Velmurugan Dhakshnamoorthy wrote:
>>
>> >
>> >         Thanks Luca,  I tried setting proxyerroroverride and error
>> >         document  in virtual host, however,  the 500 error produced by
>> >         content server is displayed as it is via Apache proxy. Any
>> >         further help?
>>
>> Are you saying you want an error message coming from the backend
>> but modified by the proxy?  That would imply using a content filter
>> (such as mod_proxy_html, mod_sed, or mod_substitute) to rewrite
>> the response from the backend.
>>
>> --
>> Nick Kew
>>
>>
>>
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>>
>>
>

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