docs: def mount(self, prefix, app, **options):
          ''' Mount an application (:class:`Bottle` or plain WSGI) to a specific
              URL prefix. Example::
  
                  root_app.mount('/admin/', admin_app)
  
              :param prefix: path prefix or `mount-point`. If it ends in a slash,
                  that slash is mandatory.
              :param app: an instance of :class:`Bottle` or a WSGI application.
  
              All other parameters are passed to the underlying :meth:`route` call.
          '''
          if isinstance(app, basestring):
              prefix, app = app, prefix
              depr('Parameter order of Bottle.mount() changed.') # 0.10
  
          parts = [p for p in prefix.split('/') if p]
          if not parts: raise ValueError('Empty path prefix.')
          path_depth = len(parts)
          options.setdefault('skip', True)
          options.setdefault('method', 'ANY')
  
          @self.route('/%s/:#.*#' % '/'.join(parts), **options)
          def mountpoint():
              try:
                  request.path_shift(path_depth)
                  rs = BaseResponse([], 200)
                  def start_response(status, header):
                      rs.status = status
                      for name, value in header: rs.add_header(name, value)
                      return rs.body.append
                  rs.body = itertools.chain(rs.body, app(request.environ, start_response))
                  return HTTPResponse(rs.body, rs.status_code, rs.headers)
              finally:
                  request.path_shift(-path_depth)
  
          if not prefix.endswith('/'):
              self.route('/' + '/'.join(parts), callback=mountpoint, **options)