docs: def get_content_of_file(self, project, repository, filename, at=None, markup=None):
          """
          Retrieve the raw content for a file path at a specified revision.
          The authenticated user must have REPO_READ permission for the specified repository to call this resource.
          :param project:
          :param repository:
          :param filename:
          :param at: OPTIONAL ref string
          :param markup: 	if present or "true", triggers the raw content to be markup-rendered and returned as HTML;
                          otherwise, if not specified, or any value other than "true",
                          the content is streamed without markup
          :return:
          """
          headers = self.form_token_headers
          url = 'projects/{project}/repos/{repository}/raw/{filename}/'.format(project=project,
                                                                               repository=repository,
                                                                               filename=filename)
          params = {}
          if at is not None:
              params['at'] = at
          if markup is not None:
              params['markup'] = markup
          return self.get(url, params=params, not_json_response=True, headers=headers)