anchor.diff:          %% This field can contain any prefix that should be added to the header
           %% value. Default is `Authorization: Bearer {}`. The token
           %% will placed where `{}` is provided.
  -        authorizationHeader => {string, optional},
  +        authorizationHeader => {string, {optional, <<"Authorization: Bearer {}">>}},
           %% The type of partial write support enabled in the WebDAV server.
           %% Currently 2 types are supported `sabredav` which assumes
           %% the server supports the SabreDAV PartialUpdate extension via
  
positive.code:         %% The name of the Swift storage container.
          containerName => string,
          %% Storage block size in bytes.
          blockSize => {integer, optional},
          %% Determines how the logical file paths will be mapped on the storage.
          %% 'canonical' paths reflect the logical file names and
          %% directory structure, however each rename operation will require
  
negative.code:         %% This field can contain any prefix that should be added to the header
          %% value. Default is `Authorization: Bearer {}`. The token
          %% will placed where `{}` is provided.
          authorizationHeader => {string, {optional, <<"Authorization: Bearer {}">>}},
          %% Defines the maximum number of parallel connections for a single HTTP
          %% storage.
          connectionPoolSize => {integer, {optional, 150}},
  