[1] Discovery | WP REST API v2 Documentation ( 版) <http://v2.wp-api.org/guide/discovery/>
The preferred way to handle discovery is to send a HEAD request to the supplied address. The REST API automatically adds a Link header to all frontend pages that looks like the following:
Link: <http://example.com/wp-json/>; rel="https://api.w.org/"
[2] ( 版) <http://www.qt.io/>
<link rel='https://api.w.org/' href='http://www.qt.io/wp-json/' />