【Spring Cloud】Spring Cloud Gateway 中配置跨域

开发高并发系统时有三把利器用来保护系统：缓存、降级和限流。API网关作为所有请求的入口，请求量大，我们可以通过对并发访问的请求进行限速来保护系统的可用性。

在Spring Cloud Gateway 中配置跨域有两种方式，分别是代码配置方式和配置文件方式。

一、代码配置方式配置跨域

代码配置方式配置跨域，代码清单如下所示：

@Configuration
public class CorsConfig {
	@Bean
	public WebFilter corsFilter() {
		return (ServerWebExchange ctx, WebFilterChain chain) -> {
			ServerHttpRequest request = ctx.getRequest();
			if(CorsUtils.isCorsRequest(request)) {
				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, "*");
				if(request.getMethod() == HttpMethod.OPTIONS){
					response.setStatusCode(HttpStatus.OK);
					return Mono.empty();
				}
			}
			return chain.filter(ctx);
		};
	}
}

二、配置文件方式配置跨域

配置文件方式配置跨域，代码清单如下所示：

spring:
	cloud:
		gateway:
			globalcors:
				corsConfigurations:
					'[/**]':
						allowedOrigins: "*"
						exposedHeaders:
						- content-type
						allowedHeaders:
						- content-type
						allowCredentials: true
						allowedMethods:
						- GET
						- OPTIONS
						- PUT
						- DELETE
						- POST

本文完结！