For the latest stable version, please use Spring Cloud Gateway 4.3.1!

ModifyResponseBody Filter

You can use the ModifyResponseBody filter to modify the response body before it is sent back to the client.

This filter can be configured only by using the Java DSL.

The following listing shows how to modify a response body filter:

GatewaySampleApplication.java
import static org.springframework.cloud.gateway.server.mvc.filter.AfterFilterFunctions.modifyResponseBody;
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;
import org.springframework.http.MediaType;

@Configuration
class RouteConfiguration {

    @Bean
    public RouterFunction<ServerResponse> gatewayRouterFunctionsModifyResponseBody() {
        return route("modify_response_bodu")
            .route(host("*.modifyresponsebodu.org"), http())
            .before(uri("https://example.org"))
            .after(modifyResponseBody(String.class, String.class, MediaType.APPLICATION_JSON_VALUE,
                    (request, s) -> s.toUpperCase()))
            .build();
    }

}
If the response has no body, the RewriteFilter is passed null. Mono.empty() should be returned to assign a missing body in the response.