benoitc 5a7c756a98 close #304 .
Intoduce a change in log access format:

- request headers are now added to the log format using the
  {HeaderName}i variable
- response headers are now handled using the {HeaderName}o variables
- headers name are insensitive
- non existent keys in the log access format are replaced by '-'
2012-02-25 14:44:38 +01:00
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