解决 Feign 调用时丢失请求头的问题

创建 Feign 拦截器

public class FeignRequestInterceptorConfig implements RequestInterceptor {

    private final Logger logger = LoggerFactory.getLogger(getClass());

    @Override
    public void apply(RequestTemplate template) {
        ServletRequestAttributes attributes = (ServletRequestAttributes) RequestContextHolder.getRequestAttributes();
        if (null != attributes) {
            HttpServletRequest request = Objects.requireNonNull(attributes).getRequest();
            Enumeration<String> headerNames = request.getHeaderNames();
            if (headerNames != null) {
                while (headerNames.hasMoreElements()) {
                    String name = headerNames.nextElement();
                    String values = request.getHeader(name);
                    template.header(name, values);
                }
                logger.debug("feign interceptor header:{}", template);
            }
        }
    }
}

若要在子线程中进行 Feign 调用时

@Override
public void syncOrder(MyHttpServletRequest myHttpServletRequest, List<Long> ids) {
    ServletRequestAttributes attributes = (ServletRequestAttributes) RequestContextHolder.getRequestAttributes();
    CompletableFuture.runAsync(() -> {
        RequestContextHolder.setRequestAttributes(attributes);
        //此后进行feign调用
        ...
    }
}