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<>Gateway网关解决跨域问题
跨域解释：
* 当一个请求url的协议、域名、端口三者之间任意一个与当前页面url不同即为跨域，如果两个URL的协议、域名和端口相同，则表示它们同源。
理解：浏览器会先发出一次options请求，该请求不会带任何参数（包括设置的头部，cookie等）， 等待服务器端返回200， 才会发出正常的请求
环境：springcloud+gateway+axios+vue
解决方法：在网关服务中加上上面类
@Configuration public class CorsConfig { @Bean public CorsWebFilter corsFilter(
) { CorsConfiguration config = new CorsConfiguration(); config.
setAllowCredentials(true); // 允许cookies跨域 config.addAllowedOrigin("*");//
#允许向该服务器提交请求的URI，*表示全部允许，在SpringMVC中，如果设成*，会自动转成当前请求头中的Origin config.
addAllowedHeader("*");// #允许访问的头信息,*表示全部 config.addAllowedMethod("*");//
允许提交请求的方法类型，*表示全部允许 config.setMaxAge(18000L);//
预检请求的缓存时间（秒），即在这个时间段里，对于相同的跨域请求不会再预检了 org.springframework.web.cors.reactive.
UrlBasedCorsConfigurationSource source= new org.springframework.web.cors.
reactive.UrlBasedCorsConfigurationSource(new PathPatternParser()); source.
registerCorsConfiguration("/**", config); return new CorsWebFilter(source); } }
