This version is still in development and is not considered stable yet. For the latest stable version, please use Spring Cloud Gateway 4.2.0!

ModifyResponseBody GatewayFilter Factory

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 GatewayFilter:

@Bean
public RouteLocator routes(RouteLocatorBuilder builder) {
    return builder.routes()
        .route("rewrite_response_upper", r -> r.host("*.rewriteresponseupper.org")
            .filters(f -> f.prefixPath("/httpbin")
        		.modifyResponseBody(String.class, String.class,
        		    (exchange, s) -> Mono.just(s.toUpperCase()))).uri(uri))
        .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.