我这里 https://use.fontawesome.com/releases/v5.0.13/css/all.css 访问超时. 但是奇怪的是使用 http 协议是没问题的 http://use.fontawesome.com/releases/v5.0.13/css/all.css . curl 的结果是这样的: $ curl -v https://use.fontawesome.com/releases/v5.0.13/css/all.css * Trying 23.111.9.35... * TCP_NODELAY set * Connected to use.fontawesome.com (23.111.9.35) port 443 (#0) * ALPN, offering h2 * ALPN, offering http/1.1 * successfully set certificate verify locations: * CAfile: /etc/ssl/certs/ca-certificates.crt CApath: /etc/ssl/certs * (304) (OUT), TLS handshake, Client hello (1): * OpenSSL SSL_connect: SSL_ERROR_SYSCALL in connection to use.fontawesome.com:443 * stopped the pause stream! * Closing connection 0 curl: (35) OpenSSL SSL_connect: SSL_ERROR_SYSCALL in connection to use.fontawesome.com:443