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Server certificates (SSL certificates) are used to authenticate the identity of a server. When installed on a website, an SSL certificate turns the protocol on the website from HTTP to HTTPS Difference b/w HTTP and https and installs indicators that vouch for the authenticity of the website.

The header value contains the client certificate from the mutually-authenticated TLS connection between the client and reverse proxy, which enables the backend origin server to utilize the certificate in its application logic.

The Expect-CT will likely become obsolete in June 2021. Since May 2018 new certificates are expected to support SCTs by default. Certificates before March 2018 were allowed to have a lifetime of 39 months, those will all be expired in June 2021.

Chrome: Importing Your Client Certificate In Chrome, go to Settings. On the Settings page, below Default browser, click Show advanced settings. Under HTTPS/SSL, click Manage certificates. In the Certificates window, on the Personal tab, click Import. In the Certificate Import Wizard, on the Welcome page, click Next.

You need to send the client certificate during the TLS handshake before anything HTTP (methods, headers, URLs, request bodies) is available to be influenced. The server will not accept a client certificate sent later.

Enabling client certificate authentication for web services access Generate a pair of self-signed public and private keys for provider.Export the certificate of the default and import the certificate into the trust store.Generate two pairs of self-signed public and private for client.

1 . - Insert the entire client certificate (in PEM format) as a Multiline HTTP header named X-Client-Cert into the incoming HTTP request and send this header to the backend server. 2 . - Insert the original ip address of the client into a HTTP header named X-Forwarder-For and send this header to the backend server.