mod proxy - ProxyPass & ProxyReverse with multiple ErrorDocuments

[andrewg 1976]

Say I have the following ProxyPass/Reverse statements:

 ProxyPass /error!
 ProxyPass /InternalWebsite/ http://svr2/
 ProxyPassReverse /InternalWebsite/ http://svr2/
 ErrorDocument 502 http://svr1/error/502.html
 ErrorDocument 500 http://svr1/error/500.html

 ProxyPass /InternalWebsite2/ http://svr3/
 ProxyPassReverse /InternalWebsite2/ http://svr3/
 ErrorDocument 502 http://svr1/error/502_svr3.html
 ErrorDocument 500 http://svr1/error/500_svr3.html

Configuring a "ErrorDocument 502" for each ProxyPass doesn't work, Apache only uses the second "ErrorDocument 502" if http://svr2/ or http://svr3/ is down.

Can I configure Aapache to use http://svr1/error/502.html if http://svr2/ is down and http://svr1/error/502_svr3.html if http://svr3 is down?

Thanks,
Andrew

[edited by: jdMorgan at 12:40 am (utc) on Oct. 11, 2007]
[edit reason] de-linked [/edit]

[jdMorgan]

The fact that the ErrorDocument directives are typed "under" the ProxyPass directives doesn't mean anything -- It does not introduce any dependency or make the use of the ErrorDocument conditional in any way. Therefore, Apache will use the last one it finds in the file.

You might want to look into the <Directory> and/or <Location> containers (or others) which do introduce a dependency of the contained code on the container. For example, using a <Location> container means that the contained code will only be applied if the requested URL matches that specified in the <Location> directive.

Jim

[andrewg 1976]

Thanks - the <location> container does the trick.

<Location /InternalWebsite2>
ProxyPass http://svr3/ 
ProxyPassReverse http://svr3/ 
ErrorDocument 502 http://svr1/error/502_svr3.html 
ErrorDocument 500 http://svr1/error/500_svr3.html
</Location>

[jdMorgan]

Do not use canonical URLs for ErrorDocuments! Doing so will cause a 302-Found response to the client for every error.

You should provide only a local URL-path for ErrorDocuments:

ErrorDocument 502 /502_svr3.html
ErrorDocument 500 /500_svr3.html 

See the Apache ErrorDocument documentation to confirm.

Jim