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The client certificate is sent during the TLS handshake when establishing a connection and can't be sent via HTTP within that connection. The communication is layered like this: HTTP (application-layer protocol) within. TLS (presentation-layer protocol) within.

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.

To send requests to an API that uses mutual TLS authentication, add your client certificate to Postman: Select Add Certificate. Enter the Host domain for the certificate (don't include the protocol). For example, enter postman-echo.com to send requests to the Postman Echo API.

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.

An HTTP header is a field of an HTTP request or response that passes additional context and metadata about the request or response. For example, a request message can use headers to indicate it's preferred media formats, while a response can use header to indicate the media format of the returned body.

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.

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.