mod_negotiation/8220: default fallback for language negotiation instead of error 406 document

[Henning Holtschneider <hh...@loca.net>]

>Number:         8220
>Category:       mod_negotiation
>Synopsis:       default fallback for language negotiation instead of error 406 document
>Confidential:   no
>Severity:       non-critical
>Priority:       medium
>Responsible:    apache
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          change-request
>Submitter-Id:   apache
>Arrival-Date:   Tue Aug 21 10:30:01 PDT 2001
>Closed-Date:
>Last-Modified:
>Originator:     hh@loca.net
>Release:        1.3.12
>Organization:
apache
>Environment:
n/a
>Description:
When using multiviews to display different language pages depending on the
browser settings, no fallback language can be defined, i.e. if no document for
the desired language is available, only an error page can be displayed. This
breaks frame-based page layouts and scares off the average user.
>How-To-Repeat:

>Fix:
RFC 2616 says: "HTTP/1.1 servers are allowed to return responses which are not
acceptable according to the accept headers sent in the request. In some cases,
this may even be preferable to sending a 406 response."
[http://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html#sec10.4.7]

So, just add a configuration directive like "FallbackLanguage" which indicates
the language that should be served instead of an error document if no acceptable
language version of a document is available on the server. This should be an 
optional configuration directive. If omitted, the default "Not Acceptable" page
should be generated.
>Release-Note:
>Audit-Trail:
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