You are a network engineer responsible for maintaining visibility into traffic flowing through the F5 proxy.

A new F5 virtual server has been deployed as a reverse proxy in front of the application. The backend team has no way to distinguish proxied traffic from requests that bypass the proxy entirely.

Ensure all requests forwarded by the proxy carry a custom HTTP header so the backend can confirm which path traffic has taken.

Configure the virtual server to insert the header f5-proxy: challenge on all inbound requests before they reach the backend pool.