Fix REST API for WSGI Add dictionary-like headers attribute. Similar to the apache implementation in same directory but we look up the given header in the wsgi environment. Environment entries are mangled (all uppercase, '-' replaced with '_', prefix HTTP_). So on lookup we mangle the given name first. This allows the rest implementation (and others) to look up headers.

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.. toctree::
   :maxdepth: 2

   docs/features
   docs/installation
   docs/upgrading
   docs/FAQ
   docs/user_guide
   docs/customizing
   docs/admin_guide
   docs/xmlrpc
   Design (original) <docs/design>
   docs/developers
   docs/tracker_templates
   docs/acknowledgements
   docs/license