Defines one or more header fields within which Reblaze can find the client's IP address. When Reblaze receives an incoming request from a client, the request will have passed through a load balancer on its way to Reblaze. This means that the header will contain the client's IP and the load-balancer IP. These two IPs are usually found within the X-Forwarded-For field, which is the default entry for Client's IP Header Name (Client Side). In this situation, Reblaze knows how to extract the client IP from this field. In other situations, a different field name might be necessary. For example, if the Reblaze customer is using Akamai CDN, the incoming request will have the client IP in a field named True-Client-IP instead.