`AddRequestHeader` 过滤器

AddRequestHeader 是一个 "before" 过滤器，它接受一个 name 和一个 value 参数。以下示例配置了 AddRequestHeader 过滤器：

application.yml

spring:
  cloud:
    gateway:
      mvc:
        routes:
        - id: add_request_header_route
          uri: https://example.org
          predicates:
          - Path=/red
          filters:
          - AddRequestHeader=X-Request-red, blue

GatewaySampleApplication.java

import static org.springframework.cloud.gateway.server.mvc.filter.BeforeFilterFunctions.uri;
import static org.springframework.cloud.gateway.server.mvc.filter.BeforeFilterFunctions.addRequestHeader;
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> gatewayRouterFunctionsAddReqHeader() {
        return route("add_request_header_route")
            .GET("/red", http())
            .before(uri("https://example.org"))
            .before(addRequestHeader("X-Request-red", "blue"));
    }
}

此配置会将 X-Request-red:blue 请求头添加到所有匹配请求的下游请求头中。

AddRequestHeader 能够识别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 AddRequestHeader 过滤器：

GatewaySampleApplication.java

import static org.springframework.cloud.gateway.server.mvc.filter.BeforeFilterFunctions.uri;
import static org.springframework.cloud.gateway.server.mvc.filter.BeforeFilterFunctions.addRequestHeader;
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> gatewayRouterFunctionsAddReqHeader() {
        return route("add_request_header_route")
            .GET("/red/{segment}", http())
            .before(uri("https://example.org"))
            .before(addRequestHeader("X-Request-red", "blue-{segment}"));
    }
}

AddRequestHeader 过滤器

`AddRequestHeader` 过滤器