About aiohttp's method of adding static resource paths

.
├── static
│   ├── css
│   │   ├── base.css
│   │   ├── bootstrap.min.css
│   │   └── font-awesome.min.css
│   ├── font
│   │   ├── FontAwesome.otf
│   │   ├── fontawesome-webfont.eot
│   │   ├── fontawesome-webfont.svg
│   │   ├── fontawesome-webfont.ttf
│   │   └── fontawesome-webfont.woff
│   └── index.html
└── proxy_server.py

 app.router.add_static('/css/',
                       path='static/css',
                       name='css')
 app.router.add_static('/font/',
                       path='static/font',
                       name='font')

def add_static(self, prefix, path, *, name=None, expect_handler=None,
                   chunk_size=256*1024, response_factory=StreamResponse,
                   show_index=False, follow_symlinks=False):
        """Add static files view.

        prefix - url prefix
        path - folder with files

        """
        # TODO: implement via PrefixedResource, not ResourceAdapter
        assert prefix.startswith('/')
        if prefix.endswith('/'):
            prefix = prefix[:-1]
        resource = StaticResource(prefix, path,
                                  name=name,
                                  expect_handler=expect_handler,
                                  chunk_size=chunk_size,
                                  response_factory=response_factory,
                                  show_index=show_index,
                                  follow_symlinks=follow_symlinks)
        self.register_resource(resource)
        return resource

<!-- Bootstrap CSS -->
<link href="css/bootstrap.min.css" rel="stylesheet">

<!-- Base CSS -->
<link href="css/base.css" rel="stylesheet">

<!-- FA CSS -->
<link href="css/font-awesome.min.css" rel="stylesheet">

 app.router.add_static('/css2017/',
                       path='static/css',
                       name='css')

<!-- Bootstrap CSS -->
<link href="css2017/bootstrap.min.css" rel="stylesheet">

<!-- Base CSS -->
<link href="css2017/base.css" rel="stylesheet">

<!-- FA CSS -->
<link href="css2017/font-awesome.min.css" rel="stylesheet">

app.router.add_static('/css2017/',
                       path='static/css',
                       name='css',
                       show_index=True)