curl https time_appconnect is zero

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my company has a web project, named projectA, is deployed in a cloud server(similar as AWS). projectA is in tomcat.

we have ssl certificate, e.g. mycompany.com, users are able to access projectA by typing https://mycompany.com/projectA which will be redirected to https://mycompany.com/projectA/loginPage.action page if user has not login(only type https://mycompany.com will show 404 page), the browsers shows this website is secured.

however, either curl -w "TCP handshake:%{time_connect}, SSL handshake: %{time_appconnect}\n" -so /dev/null https://mycompany.com or curl -w "TCP handshake:%{time_connect}, SSL handshake: %{time_appconnect}\n" -so /dev/null https://mycompany.com/projectA, or curl -w "TCP handshake:%{time_connect}, SSL handshake: %{time_appconnect}\n" -so /dev/null https://mycompany.com/projectA/loginPage.action their time_appconnect are zero, why? time_connect has value.

i run curl in a cloud server whose CentOS is 7.9.2009(Core), Linux version 3.10.0, curl version is 7.29.0



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