`AddRequestParameter` 过滤器

`AddRequestParameter` 过滤器接受 `name` 和 `value` 参数。以下示例配置了一个 `AddRequestParameter` 过滤器

application.yml

spring:
  cloud:
    gateway:
      mvc:
        routes:
        - id: add_request_parameter_route
          uri: https://example.org
          predicates:
          - Path=/anything/addrequestparam
          filters:
          - AddRequestParameter=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.addRequestParameter;
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> gatewayRouterFunctionsAddReqParameter() {
        return route("add_request_parameter_route")
            .GET("/anything/addrequestparam", http())
            .before(uri("https://example.org"))
            .before(addRequestParameter("red", "blue"))
            .build();
    }
}

这将为所有匹配的请求向下游请求的查询字符串添加 `red=blue`。

`AddRequestParameter` 知道用于匹配路径或主机的 URI 变量。URI 变量可在值中使用，并在运行时展开。以下示例配置了一个使用变量的 `AddRequestParameter` 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.addRequestParameter;
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> gatewayRouterFunctionsAddReqParameter() {
        return route("add_request_parameter_route")
            .route(host("{segment}.myhost.org"), http())
            .before(uri("https://example.org"))
            .before(addRequestParameter("foo", "bar-{segment}"))
            .build();
    }
}

AddRequestParameter 过滤器

`AddRequestParameter` 过滤器