feign远程调用丢失头，Feign异步情况丢失上下文问题

1、feign远程调用丢失头

解决：设置feign的求情拦截器

@Configuration
public class MyFeignConfig {
    @Bean("requestInterceptor")
    public RequestInterceptor requestInterceptor(){
        RequestInterceptor requestInterceptor = requestTemplate -> {
            //RequestContextHolder拿到刚进来的请求
            ServletRequestAttributes requestAttributes = (ServletRequestAttributes) RequestContextHolder.getRequestAttributes();
            if (requestAttributes!=null){
                HttpServletRequest request = requestAttributes.getRequest();
                if(request!=null){
                    //同步请求头数据，cookie
                    requestTemplate.header("Cookie",request.getHeader("Cookie"));
                }
            }
        };
        return requestInterceptor;
    }
}

2、Feign异步情况丢失上下文问题

由于feigb请求拦截器为新的request设置请求头底层是使用ThreadLocal保存刚进来的请求,所以在异步情况下，其他线程并不能获取到主线程的ThreadLocal，所以也拿不到请求。

解决：先获取主线程的ThreadLocal保存的请求数据，再分别向其他线程中设置

        //拿到主线程请求，放到各个异步任务中
        RequestAttributes requestAttributes = RequestContextHolder.getRequestAttributes();//

        CompletableFuture<Void> addrFuture = CompletableFuture.runAsync(() -> {
           //设置到其他线程
            RequestContextHolder.setRequestAttributes(requestAttributes);
            //远程调用查地址
            List<MemberReceiveAddressVo> address = memberFeignService.getAddress(memberVo.getId());
            orderConfirmVo.setAddressVos(address);
        }, threadPoolExecutor);