`SetRequestHeader` 過濾器

SetRequestHeader 過濾器接受 name 和 value 引數。以下列表配置了一個 SetRequestHeader 過濾器

application.yml

spring:
  cloud:
    gateway:
      mvc:
        routes:
        - id: setrequestheader_route
          uri: https://example.org
          predicates:
          - Path=/**
          filters:
          - SetRequestHeader=X-Request-Red, Blue

GatewaySampleApplication.java

import static org.springframework.cloud.gateway.server.mvc.filter.BeforeFilterFunctions.setRequestHostHeader;
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> gatewayRouterFunctionsSetRequestHeader() {
        return route("setrequestheader_route")
            .GET("/**", http())
            .before(uri("https://example.org"))
            .before(setRequestHostHeader("X-Request-Red", "Blue"))
            .build();
    }
}

此過濾器會替換（而不是新增）所有具有給定名稱的請求頭。因此，如果下游伺服器響應了 X-Request-Red:1234，它將被替換為 X-Request-Red:Blue，下游服務將收到此請求頭。

SetRequestHeader 知道用於匹配路徑或主機的 URI 變數。URI 變數可以在值中使用，並在執行時展開。以下示例配置了一個使用變數的 SetRequestHeader 過濾器

application.yml

spring:
  cloud:
    gateway:
      routes:
      - id: setrequestheader_route
        uri: https://example.org
        predicates:
        - Host: {segment}.myhost.org
        filters:
        - SetRequestHeader=X-Request-Red, Blue-{segment}

GatewaySampleApplication.java

import static org.springframework.cloud.gateway.server.mvc.filter.BeforeFilterFunctions.setRequestHostHeader;
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> gatewayRouterFunctionsSetRequestHeader() {
        return route("setrequestheader_route")
            .route(host("{segment}.myhost.org"), http())
            .before(uri("https://example.org"))
            .before(setRequestHostHeader("X-Request-Red", "Blue-{segment}"))
            .build();
    }
}

SetRequestHeader 過濾器

`SetRequestHeader` 過濾器