SetResponseHeader 过滤器

SetResponseHeader 过滤器接受 namevalue 参数。以下清单配置了一个 SetResponseHeader 过滤器

application.yml
spring:
  cloud:
    gateway:
      mvc:
        routes:
        - id: setresponseheader_route
          uri: https://example.org
          predicates:
          - Path=/anything/setresponseheader
          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.filter.BeforeFilterFunctions.uri;
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("setresponseheader_route")
            .GET("/anything/setresponseheader", http())
            .before(uri("https://example.org"))
            .after(setResponseHeader("X-Response-Red", "Blue"))
            .build();
    }
}

此 GatewayFilter 会替换(而不是添加)所有具有给定名称的头。因此,如果下游服务器响应了 X-Response-Red:1234,它将被替换为 X-Response-Red:Blue,这将是网关客户端接收到的内容。

SetResponseHeader 过滤器知道用于匹配路径或主机的 URI 变量。URI 变量可以在值中使用,并在运行时进行扩展。以下示例配置了一个使用变量的 SetResponseHeader 过滤器

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.filter.BeforeFilterFunctions.uri;
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("setresponseheader_route")
            .route(host("{segment}.myhost.org"), http())
            .before(uri("https://example.org"))
            .after(setResponseHeader("foo", "bar-{segment}"))
            .build();
    }
}