curl https://im.dingtalk.com/ -vvv -k
- Trying 106.11.35.100...
- TCP_NODELAY set
- Connected to im.dingtalk.com (106.11.35.100) port 443 (#0)
- ALPN, offering h2
- ALPN, offering http/1.1
- successfully set certificate verify locations:
- CAfile: /etc/ssl/cert.pem
CApath: none
- TLSv1.2 (OUT), TLS handshake, Client hello (1):
- TLSv1.2 (IN), TLS handshake, Server hello (2):
- TLSv1.2 (IN), TLS handshake, Certificate (11):
- TLSv1.2 (IN), TLS handshake, Server key exchange (12):
- TLSv1.2 (IN), TLS handshake, Server finished (14):
- TLSv1.2 (OUT), TLS handshake, Client key exchange (16):
- TLSv1.2 (OUT), TLS change cipher, Change cipher spec (1):
- TLSv1.2 (OUT), TLS handshake, Finished (20):
- TLSv1.2 (IN), TLS change cipher, Change cipher spec (1):
- TLSv1.2 (IN), TLS handshake, Finished (20):
- SSL connection using TLSv1.2 / ECDHE-RSA-CHACHA20-POLY1305
- ALPN, server did not agree to a protocol
- Server certificate:
- subject: C=CN; ST=ZheJiang; L=HangZhou; O=Alibaba (China) Technology Co., Ltd.; CN=*.dingtalk.com
- start date: Apr 19 01:31:03 2021 GMT
- expire date: May 21 01:31:03 2022 GMT
- issuer: C=US; ST=CA; O=EagleEye, Inc.
- SSL certificate verify result: unable to get local issuer certificate (20), continuing anyway.