PreserveHostHeader Filter

PreserveHostHeader 过滤器没有参数。此过滤器设置了一个请求属性，HandlerFunction 检查该属性以确定是否应该发送原始 Host 头，而不是由 HTTP 客户端确定的 Host 头。以下示例配置一个 PreserveHostHeader 过滤器：

application.yml
spring:
  cloud:
    gateway:
      mvc:
        routes:
        - id: preserve_host_route
          uri: https://example.org
          filters:
          - PreserveHostHeader
GatewaySampleApplication.java
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("https://example.org"))
					.before(preserveHostHeader())
					.build();
    }
}