`SetResponseHeader` Filter

SetResponseHeader 过滤器采用 name 和 value 参数。以下清单配置了一个 SetResponseHeader 过滤器：

The SetResponseHeader filter takes name and value parameters. The following listing configures a SetResponseHeader filter:

application.yml

spring:
  cloud:
    gateway:
      mvc:
        routes:
        - id: setresponseheader_route
          uri: https://example.org
          filters:
          - SetResponseHeader=X-Response-Red, Blue

GatewaySampleApplication.java

import static org.springframework.cloud.gateway.server.mvc.filter.AfterFilterFunctions.setResponseHeader;
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> gatewayRouterFunctionsSetResponseHeader() {
        return route("addresponseheader")
                .GET("/anything/addresheader", http("https://example.org"))
                .after(setResponseHeader("X-Response-Red", "Blue"))
            .build();
    }
}

此 GatewayFilter 替换（而不是添加）所有具有给定名称的标头。因此，如果下游服务器用 X-Response-Red:1234 响应，它将被替换为 X-Response-Red:Blue，这是网关客户端将收到的内容。

This GatewayFilter replaces (rather than adding) all headers with the given name. So, if the downstream server responded with X-Response-Red:1234, it will be replaced with X-Response-Red:Blue, which is what the gateway client would receive.

SetResponseHeader 了解用于匹配路径或主机的 URI 变量。URI 变量可用于值，并会在运行时进行展开。以下示例配置了一个使用变量的 SetResponseHeader 过滤器：

SetResponseHeader is aware of URI variables used to match a path or host. URI variables may be used in the value and will be expanded at runtime. The following example configures an SetResponseHeader filter that uses a variable:

application.yml

spring:
  cloud:
    gateway:
      routes:
      - id: setresponseheader_route
        uri: https://example.org
        predicates:
        - Host: {segment}.myhost.org
        filters:
        - SetResponseHeader=foo, bar-{segment}

GatewaySampleApplication.java

import static org.springframework.cloud.gateway.server.mvc.filter.AfterFilterFunctions.setResponseHeader;
import static org.springframework.cloud.gateway.server.mvc.handler.GatewayRouterFunctions.route;
import static org.springframework.cloud.gateway.server.mvc.handler.HandlerFunctions.http;
import static org.springframework.cloud.gateway.server.mvc.predicate.GatewayRequestPredicates.host;

@Configuration
class RouteConfiguration {

    @Bean
    public RouterFunction<ServerResponse> gatewayRouterFunctionsSetResponseHeader() {
		return route("add_response_header_route")
				.route(host("{segment}.myhost.org"), http("https://example.org"))
				.after(setResponseHeader("foo", "bar-{segment}"))
				.build();
    }
}

SetResponseHeader Filter

`SetResponseHeader` Filter