ProxyErrorOverride patch

[Jens Laas <je...@uadm.uu.se>]

Hello!

Sending a patch that extends proxyerroroverride with another, optional, 
parameter. The diff is against httpd-2.4.9.

This parameter makes it possible to define exactly which status codes should be 
overridden. Modeled after "failonstatus".

Usage example:
ProxyErrorOverride On 500,501,502,503,504

Motivation: In our reverse proxy setup, we want to show a custom error page when 
the backend application fails (5xx), but not for 4xx which the application 
handles on its own.

I hope you will be able to incorporate something similar into Apache.

The proxy_http part is not tested.

Best regards,
Jens Låås

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    Jens Låås                              Email: jens.laas@its.uu.se
    ITS                                    Phone: +46 18 471 77 03
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