在webflux中使用WebFilter corsFilter时，为什么请求返回404状态？
在webflux中使用WebFilter corsFilter时，为什么请求返回404状态？
提问于 2019-07-15 05:00:56
我想使用函数端点在Spring Webflux中构建一个REST api。对于CORS，我使用WebFilter corsFilter方法来设置所需的标头。我确实看到该方法被调用(我看到了来自它的日志消息)，并且我看到响应上的头确实是我在Webflux api中设置的头。但是，一旦我开始使用corsFilter，请求就会返回404状态(之前它们会返回JSON)。我怀疑corsFilter不会将请求传递给路由器功能。为什么会这样呢？
具体地说，我想知道这一行是否足以连接cors配置和路由：
HttpHandler httpHandler = WebHttpHandlerBuilder.webHandler(RouterFunctions.toWebHandler(route))
.applicationContext(ctx).build();这是我的主类：
package com.mypackage;
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;
import org.springframework.web.reactive.function.server.RouterFunctions;
import org.springframework.web.server.adapter.WebHttpHandlerBuilder;
import reactor.ipc.netty.http.server.HttpServer;
import org.springframework.http.HttpMethod;
import org.springframework.http.server.reactive.HttpHandler;
import org.springframework.http.server.reactive.ReactorHttpHandlerAdapter;
import org.springframework.web.reactive.function.server.RouterFunction;
import org.springframework.web.reactive.function.server.ServerResponse;
import static org.springframework.http.HttpStatus.UNAUTHORIZED;
import static org.springframework.http.MediaType.APPLICATION_JSON;
import static org.springframework.web.reactive.function.server.RequestPredicates.GET;
import static org.springframework.web.reactive.function.server.RequestPredicates.POST;
import static org.springframework.web.reactive.function.server.RequestPredicates.accept;
import static org.springframework.web.reactive.function.server.RequestPredicates.contentType;
import static org.springframework.web.reactive.function.server.RequestPredicates.method;
import static org.springframework.web.reactive.function.server.RequestPredicates.path;
import static org.springframework.web.reactive.function.server.RouterFunctions.nest;
import static org.springframework.web.reactive.function.server.RouterFunctions.route;
import static org.springframework.web.reactive.function.server.RouterFunctions.toHttpHandler;
@SpringBootApplication
public class Server {
private static final Logger log = LogManager.getLogger(Server.class);
public static final String HOST = "localhost";
public static final int PORT = 8080;
public static void main(String[] args) throws Exception {
AnnotationConfigApplicationContext ctx = new AnnotationConfigApplicationContext(CorsConfiguration.class);
Server server = new Server();
server.startReactorServer(ctx);
System.out.println("Press ENTER to exit.");
System.in.read();
}
public RouterFunction<ServerResponse> routingFunction() {
PersonRepository repository = new DummyPersonRepository();
PersonHandler handler = new PersonHandler(repository);
return nest(path("/person"),
nest(accept(APPLICATION_JSON),
route(GET("/{id}"), handler::getPerson)
.andRoute(method(HttpMethod.GET), handler::listPeople)
).andRoute(POST("/").and(contentType(APPLICATION_JSON)), handler::createPerson));
}
public void startReactorServer(AnnotationConfigApplicationContext ctx) {
RouterFunction<ServerResponse> route = this.routingFunction().filter((request, next) -> {
log.warn(request.path());
if (request.path().contains("person")) {
log.warn("calling next()");
return next.handle(request);
} else {
return ServerResponse.status(UNAUTHORIZED).build();
}
});
HttpHandler httpHandler = WebHttpHandlerBuilder.webHandler(RouterFunctions.toWebHandler(route))
.applicationContext(ctx).build();
ReactorHttpHandlerAdapter adapter = new ReactorHttpHandlerAdapter(httpHandler);
HttpServer server = HttpServer.create(HOST, PORT);
server.newHandler(adapter).block();
}
}这是我的CORS配置类：
package com.mypackage;
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpMethod;
import org.springframework.http.HttpStatus;
import org.springframework.http.server.reactive.ServerHttpRequest;
import org.springframework.http.server.reactive.ServerHttpResponse;
import org.springframework.web.cors.reactive.CorsUtils;
import org.springframework.web.reactive.config.EnableWebFlux;
import org.springframework.web.server.ServerWebExchange;
import org.springframework.web.server.WebFilter;
import org.springframework.web.server.WebFilterChain;
import reactor.core.publisher.Mono;
@Configuration
@EnableWebFlux
public class CorsConfiguration {
private static final Logger log = LogManager.getLogger(CorsConfiguration.class);
private static final String ALLOWED_HEADERS = "x-requested-with, authorization, Content-Type, Authorization, credential, X-XSRF-TOKEN, mode";
private static final String ALLOWED_METHODS = "GET, PUT, POST, DELETE, OPTIONS";
private static final String ALLOWED_ORIGIN = "*";
private static final String MAX_AGE = "3600";
@Bean
public WebFilter corsFilter() {
log.warn("from CorsConfiguration!!!");
return (ServerWebExchange ctx, WebFilterChain chain) -> {
ServerHttpRequest request = ctx.getRequest();
log.warn("after ServerHttpRequest");
if (CorsUtils.isCorsRequest(request)) {
log.warn("inside isCorsRequest");
ServerHttpResponse response = ctx.getResponse();
HttpHeaders headers = response.getHeaders();
headers.add("Access-Control-Allow-Origin", ALLOWED_ORIGIN);
headers.add("Access-Control-Allow-Methods", ALLOWED_METHODS);
headers.add("Access-Control-Max-Age", MAX_AGE);
headers.add("Access-Control-Allow-Headers", ALLOWED_HEADERS);
if (request.getMethod() == HttpMethod.OPTIONS) {
response.setStatusCode(HttpStatus.OK);
return Mono.empty();
}
}
return chain.filter(ctx);
};
}
}回答 1
Stack Overflow用户
回答已采纳
发布于 2019-07-16 02:29:07
为了在定义端点时使用函数式方法，Spring Boot的官方文档提供了一个非常简单的示例。
FooBarApplication.class这是我们的主类。
@SpringBootApplication
public class FooBarApplication {
public static void main(String[] args) {
SpringApplication.run(FooBarApplication.class, args);
}
}RoutingConfiguration.class (或者你想叫它的任何东西)
@Configuration
public class RoutingConfiguration {
@Bean
public RouterFunction<ServerResponse> monoRouterFunction(UserHandler userHandler) {
return route(GET("/{user}").and(accept(APPLICATION_JSON)), userHandler::getUser)
.andRoute(GET("/{user}/customers").and(accept(APPLICATION_JSON)), userHandler::getUserCustomers)
.andRoute(DELETE("/{user}").and(accept(APPLICATION_JSON)), userHandler::deleteUser);
}
}
@Component
public class UserHandler {
public Mono<ServerResponse> getUser(ServerRequest request) {
// ...
}
public Mono<ServerResponse> getUserCustomers(ServerRequest request) {
// ...
}
public Mono<ServerResponse> deleteUser(ServerRequest request) {
// ...
}
}任何带有@Configuration注释的类都将在启动时运行，并运行所有带有@Bean注释的方法。因此，这将运行monoRouterFunction并为我们设置所有路由。
示例取自官方spring boot文档Spring boot webflux向下滚动一点。
编辑:作为附注，@EnableWebFlux注释意味着您将禁用webflux的自动配置，并手动设置upp配置。如果你刚刚开始(我知道这个名字很容易误导)，我不建议你这样做。你可以在这里阅读Spring WebFlux Auto-configuration的webflux自动配置。
EDIT2: WebFlux有一个内置的CorsFilter，您只需对其进行配置即可使用。
@Bean
CorsWebFilter corsWebFilter() {
CorsConfiguration corsConfig = new CorsConfiguration();
corsConfig.setAllowedOrigins(Arrays.asList("http://allowed-origin.com"));
corsConfig.setMaxAge(8000L);
corsConfig.addAllowedMethod("PUT");
corsConfig.addAllowedHeader("Baeldung-Allowed");
UrlBasedCorsConfigurationSource source =
new UrlBasedCorsConfigurationSource();
source.registerCorsConfiguration("/**", corsConfig);
return new CorsWebFilter(source);
}页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/57031142
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