ForwardedHeadersFilter from의 헤더를 to 로 복사해서 보내주는 역할을 하는 것으로 보인다. package org.springframework.cloud.gateway.filter.headers; public class ForwardedHeadersFilter implements HttpHeadersFilter, Ordered { /** * Forwarded header. */ public static final String FORWARDED_HEADER = "Forwarded"; ... @Override public HttpHeaders filter(HttpHeaders input, ServerWebExchange exchange) { ServerHttpRequest request..