RequestInterceptor过滤器，微服务之间feign调用请求头丢失的问题

    /**
     * 微服务之间传递的唯一标识
     */
    public static final String X_REQUEST_ID = "X-Request-Id";

    @Override
    public void apply(RequestTemplate template) {
        HttpServletRequest httpServletRequest = (ServletRequestAttributes) RequestContextHolder.getRequestAttributes())
        .getRequest();
        if (httpServletRequest != null) {
             
            Map<String, String> headers = getHeaders(httpServletRequest);
            // 传递所有请求头,防止部分丢失
            for (Map.Entry<String, String> entry : headers.entrySet()) {
                // 防止添加重复
                if (!template.headers().containsKey(entry.getKey())) {
                    template.header(entry.getKey(), entry.getValue());
                }
            }
            // 微服务之间传递的唯一标识,区分大小写所以通过httpServletRequest查询
            if (headers.containsKey(X_REQUEST_ID)) {
                String traceId = headers.get(X_REQUEST_ID);
                //不做处理
//                MDC.put("traceId", traceId);
                log.info("FeignRequestInterceptor X-Request-Id:{}", traceId);
            }
            if (log.isDebugEnabled()) {
                log.debug("FeignRequestInterceptor:{}", template.toString());
            }
        }
    }

private Map<String, String> getHeaders(HttpServletRequest request) {
    Map<String, String> map = new LinkedHashMap<>();
    Enumeration<String> enumeration = request.getHeaderNames();
    if (enumeration != null) {
        while (enumeration.hasMoreElements()) {
            String key = enumeration.nextElement();
            String value = request.getHeader(key);
            map.put(key, value);
        }
    }
    return map;
}

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