Help Center> Elastic Load Balance> User Guide (Paris Region) > FAQ> Listeners> What HTTP Headers Can I Configure for an HTTP and HTTP Listener?

Updated on 2023-11-25 GMT+08:00

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What HTTP Headers Can I Configure for an HTTP and HTTP Listener?

Table 1 describes the HTTP headers supported by HTTP and HTTP Listeners.

**Table 1** Supported headers
Headers	Description
X-Forwarded-ELB-IP	The EIP bound to the load balancer is transmitted to backend servers through the HTTP header.
X-Forwarded-Host	The Host field in the request from the client is placed in X-Forwarded-Host and sent to backend servers.
X-Forwarded-Port	The protocol used by the listener is transmitted to backend servers through the HTTP header.
X-Forwarded-Proto	The protocol type (HTTP or HTTPS) of the request is transmitted to backend servers through the HTTP header.
X-Forwarded-For	Source IP addresses and proxy IP addresses of the clients are transmitted to backend servers through the HTTP header.
X-Real-IP	Source IP addresses of the clients are transmitted to backend servers through the HTTP header.