博客

版本

Spring Cloud ：

Greenwich.SR1


Spring Cloud Gateway :

2.1.1.RELEASE


现象

跨域时POST请求body内容为空，报跨域失败错误

原因是Access-Control-Allow-Origin只允许有一个值，而响应头里有多个Origin

The ‘Access-Control-Allow-Origin’ header contains multiple values “*, *”, but only one is allowed.

解决方式

@Configuration
public class CorsConfiguration {
   

    private static final String ALLOWED_HEADERS = "x-requested-with, authorization, Content-Type, Authorization, credential, X-XSRF-TOKEN,token,username,client";
    private static final String ALLOWED_METHODS = "*";
    private static final String ALLOWED_ORIGIN = "*";
    private static final String ALLOWED_EXPOSE = "*";
    private static final String MAX_AGE = "3600";

    @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.set("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);
                headers.add("Access-Control-Expose-Headers", ALLOWED_EXPOSE);
                headers.add("Access-Control-Allow-Credentials", "true");
                if (request.getMethod() == HttpMethod.OPTIONS) {
   
                    response.setStatusCode(HttpStatus.OK);
                    return Mono.empty();
                }
            }
            return chain.filter(ctx);
        };
    }
}


@Component("corsResponseHeaderFilter")
public class CorsResponseHeaderFilter implements GlobalFilter, Ordered {
   
    
    @Override
    public int getOrder() {
   
        // 指定此过滤器位于NettyWriteResponseFilter之后
        // 即待处理完响应体后接着处理响应头
        return NettyWriteResponseFilter.WRITE_RESPONSE_FILTER_ORDER + 1;
    }

    @Override
    public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {
   
        return chain.filter(exchange).then(Mono.defer(() -> {
   
            exchange.getResponse().getHeaders().entrySet().stream()
                    .filter(kv -> (kv.getValue() != null && kv