Backend GateWay solves cross-domain problems

@Slf4j
@Configuration(proxyBeanMethods = false)
@AllArgsConstructor
@EnableConfigurationProperties({
    
    AuthProperties.class})
public class RouterFunctionConfiguration {
    
    

	/**
	 * 这里为支持的请求头，如果有自定义的header字段请自己添加
	 */
	private static final String ALLOWED_HEADERS = "X-Requested-With, Tenant-Id, Content-Type, Authorization, credential, X-XSRF-TOKEN, token, username, client, knfie4j-gateway-request, request-origion";
	private static final String ALLOWED_METHODS = "GET,POST,PUT,DELETE,OPTIONS,HEAD";
	private static final String ALLOWED_ORIGIN = "*";
	private static final String ALLOWED_EXPOSE = "*";
	private static final String MAX_AGE = "18000L";

	/**
	 * 跨域配置
	 */
	@Bean
	public WebFilter corsFilter() {
    
    
		return (ServerWebExchange ctx, WebFilterChain chain) -> {
    
    
			ServerHttpRequest request = ctx.getRequest();
			if (CorsUtils.isCorsRequest(request)) {
    
    
				ServerHttpResponse response = ctx.getResponse();
				HttpHeaders headers = response.getHeaders();
				headers.add("Access-Control-Allow-Headers", ALLOWED_HEADERS);
				headers.add("Access-Control-Allow-Methods", ALLOWED_METHODS);
				headers.add("Access-Control-Allow-Origin", ALLOWED_ORIGIN);
				headers.add("Access-Control-Expose-Headers", ALLOWED_EXPOSE);
				headers.add("Access-Control-Max-Age", MAX_AGE);
				headers.add("Access-Control-Allow-Credentials", "true");
				if (request.getMethod() == HttpMethod.OPTIONS) {
    
    
					response.setStatusCode(HttpStatus.OK);
					return Mono.empty();
				}
			}
			return chain.filter(ctx);
		};
	}

}