Amazon Application Load Balancer X Forwarded For. Application Load Balancers and Classic Load Balancers add X-Forwarded-For, X-Forwarded-Proto, and X-Forwarded-Port headers to the request. For front-end connections that use HTTP/2, the header names are in lowercase. The X-Forwarded-For (XFF) HTTP header field is a common method for identifying the originating IP address of a client connecting to a web server through an HTTP proxy or load balancer.. The X-Forwarded-For HTTP request header was introduced by the Squid caching proxy server's developers. [citation needed]X-Forwarded-For is also an email-header indicating that an email-message was forwarded. For Application Load Balancers and Classic Load Balancers with HTTP/HTTPS listeners, you must use X-Forwarded-For headers to capture client IP addresses. Then, you must print those client IP addresses in your access logs.
With Classic and Application load balancers, we had to use HTTP header X-Forwarded-For to get the remote IP address. Long-lived TCP connections: Network Load Balancer supports long-running TCP connections that can be open for months or years, making it ideal for WebSocket-type applications, IoT, gaming, and messaging applications. Elastic Load Balancing stores the protocol used between the client and the load balancer in the X-Forwarded-Proto request header and passes the header along to your server. Your application or website can use the protocol stored in the X-Forwarded-Proto request header to render a response that redirects to the appropriate URL.
The X-Forwarded-Proto headers won't be chained by either ALB or the classic load balancer. However for X-Forwarded-For headers, they would get chained by the ALB. For example, if a client a.a.a.a is sending a request over HTTP to the ALB which has the following headers ### X-Forwarded-Proto : https X-Forwarded-For : a.b.c.d ###
The Amazon Elastic Load Balancer (ELB) supports a HTTP header called X-FORWARDED-PROTO. All the HTTPS requests going through the ELB will have the value of X-FORWARDED-PROTO equal to “ HTTPS “. Application Load Balancers and Classic Load Balancers add X-Forwarded-For, X-Forwarded-Proto, and X-Forwarded-Port headers to the request. For front-end connections that use HTTP/2, the header names are in lowercase. Elastic Load Balancer basics. An Elastic Load Balancer (ELB) is one of the key architecture components for many applications inside the AWS cloud.In addition to autoscaling, it enables and simplifies one of the most important tasks of our application’s architecture: scaling up and down with high availability. Elastic Load Balancing automatically distributes incoming application traffic. The fix for this is that Amazon's ELB sends the de-facto standard X-Forwarded-Proto HTTP header, which we can use to figure out which protocol the client is actually using on the other side of the Load Balancer. With Apache 2.2, you could use something along the lines of:
