Option = {priv_file, atom(), string() | binary()} | {priv_file, atom(), string() | binary(), Extra} | {file, string() | binary()} | {file, string() | binary(), Extra} | {priv_dir, atom(), string() | binary()} | {priv_dir, atom(), string() | binary(), Extra} | {dir, string() | binary()} | {dir, string() | binary(), Extra} Extra = [ETag | Mimetypes] ETag = {etag, module(), function()} | {etag, false} Mimetypes = {mimetypes, module(), function()} | {mimetypes, binary() | {binary(), binary(), [{binary(), binary()}]}}