最近2周，文档服务器访问不稳定：偶尔可以访问，大多数时候不能访问。 以下是我从阿里云服务器上curl的信息： ----- # curl https://docs.espressif.com curl: (60) SSL certificate problem: certificate has expired More details here: http://curl.haxx.se/docs/sslcerts.html curl performs SSL certificate verification by default, using a "bundle" of Certificate ...