"MaxRanges 0" semantics and new MaxRanges
string options in default configuration snippet.

Hope that's CTR because the setting is commented
out by default.


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    byterange: Range of '0-' returns 206

Submitted by: Jim Jagielski
Reviewed by: jim, rpluem, rjung, sf


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Submitted by: jfclere
Backports: r1166551, r1166657
Reviewed by: wrowe, jorton

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refactor to pull setting of Accept-Ranges header into http_protocol.c which
had been copied to other handlers.



Set Accept-Rangs: none instead of unsetting the Accept-Range header when we
have a filter that doesn't like byteranges.

Submitted By: Eric Covener
Reviewed By: covener, wrowe, rpluem


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    take care of some MaxRanges feedback:
     * allow "none" to be expressed in config
     * stop accepting confusing/ambiguous "0", start accepting "unlimited".

Reviewed By: covener, wrowe, rpluem



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* Do not even sent an empty brigade down the filter chain if the headers
  have not been sent by the AJP server so far. Even an empty brigade
  will trigger the headers filter to create the (in this case incomplete)
  HTTP headers of the response.

PR: 51608
Submitted by: rpluem
Reviewed by: rpluem, jim, jfclere


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