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spring cloud 中怎么利用gateway跨域请求,很多新手对此不是很清楚,为了帮助大家解决这个难题,下面小编将为大家详细讲解,有这方面需求的人可以来学习下,希望你能有所收获。
代码如下
@Configuration public class CorsConfig implements GlobalFilter, Ordered { private static final String ALL = "*"; private static final String MAX_AGE = "18000L"; @Bean public RouteDefinitionLocator discoveryClientRouteDefinitionLocator(DiscoveryClient discoveryClient, DiscoveryLocatorProperties properties) { return new DiscoveryClientRouteDefinitionLocator(discoveryClient, properties); } @Bean public ServerCodecConfigurer serverCodecConfigurer() { return new DefaultServerCodecConfigurer(); } //添加请求头 @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); }; } //将请求头中有多个值的去掉 这是该版本的一个bug @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.getValue().size() > 1)) .filter(kv -> (kv.getKey().equals(HttpHeaders.ACCESS_CONTROL_ALLOW_ORIGIN) || kv.getKey().equals(HttpHeaders.ACCESS_CONTROL_ALLOW_CREDENTIALS))) .forEach(kv -> { kv.setValue(new ArrayList<String>() {{ add(kv.getValue().get(0)); }}); }); return chain.filter(exchange); })); } @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; } }
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