在Spring 5 Webflux中，配置CORS，可以通過自定義WebFilter實現：

注：此種寫法需真實跨域訪問，監控header中才會帶相應屬性。

代碼實現方式

import org.springframework.http.HttpHeaders; 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.server.ServerWebExchange; import org.springframework.web.server.WebFilter; import org.springframework.web.server.WebFilterChain; import org.springframework.http.HttpMethod; import reactor.core.publisher.Mono;import static org.springframework.web.cors.CorsConfiguration.ALL; public class XXXApplication{ public static void main(String[] args) {SpringApplication.run(XXXApplication.class, args); } private static final String MAX_AGE = "18000L"; @Bean public WebFilter corsFilter() {return (ServerWebExchange ctx, WebFilterChain chain) -> {ServerHttpRequest request = ctx.getRequest();if (!CorsUtils.isCorsRequest(request)) {return chain.filter(ctx);}HttpHeaders requestHeaders = request.getHeaders();ServerHttpResponse response = ctx.getResponse();HttpMethod requestMethod = requestHeaders.getAccessControlRequestMethod();HttpHeaders headers = response.getHeaders();headers.add(HttpHeaders.ACCESS_CONTROL_ALLOW_ORIGIN, requestHeaders.getOrigin());headers.addAll(HttpHeaders.ACCESS_CONTROL_ALLOW_HEADERS, requestHeaders.getAccessControlRequestHeaders());if (requestMethod != null) {headers.add(HttpHeaders.ACCESS_CONTROL_ALLOW_METHODS, requestMethod.name());}headers.add(HttpHeaders.ACCESS_CONTROL_ALLOW_CREDENTIALS, "true");headers.add(HttpHeaders.ACCESS_CONTROL_EXPOSE_HEADERS, ALL);headers.add(HttpHeaders.ACCESS_CONTROL_MAX_AGE, MAX_AGE);if (request.getMethod() == HttpMethod.OPTIONS) {response.setStatusCode(HttpStatus.OK);return Mono.empty();}return chain.filter(ctx);}; } }

配置實現方式

網上還提到一種配置寫法，實測好用（感謝評論兄弟fiberhuo補充）：

spring:cloud:gateway:globalcors:corsConfigurations:'[/**]':allowedOrigins: "*"allowedMethods: "*"allowedHeaders: "*"

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總結

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