PreserveHostHeader 过滤器

PreserveHostHeader 过滤器没有参数。此过滤器设置一个请求属性，HandlerFunction 将检查该属性以确定是发送原始主机头，还是发送由 HTTP 客户端确定的主机头。以下示例配置了一个 PreserveHostHeader 过滤器

application.yml
spring:
  cloud:
    gateway:
      mvc:
        routes:
        - id: preserve_host_route
          uri: https://example.org
          predicates:
          - Path=/**
          filters:
          - PreserveHostHeader
GatewaySampleApplication.java
import static org.springframework.cloud.gateway.server.mvc.filter.BeforeFilterFunctions.uri;
import static org.springframework.cloud.gateway.server.mvc.filter.BeforeFilterFunctions.preserveHostHeader;
import static org.springframework.cloud.gateway.server.mvc.handler.GatewayRouterFunctions.route;
import static org.springframework.cloud.gateway.server.mvc.handler.HandlerFunctions.http;

@Configuration
class RouteConfiguration {

    @Bean
    public RouterFunction<ServerResponse> gatewayRouterFunctionsPreserveHostHeader() {
        return route("preserve_host_route")
            .GET("/**", http())
            .before(uri("https://example.org"))
            .before(preserveHostHeader())
            .build();
    }
}