记一次Feign调用出错

服务方出现Invalid character found in method name. HTTP method names must be tokens
本地有配置重写Feign的url方式，同时透传了header，导致服务方报错。
解决办法：

    @Override
    public void apply(RequestTemplate template) {
        List<String> headNameList = Arrays.asList("content-type", "content-length");
        ServletRequestAttributes attributes = (ServletRequestAttributes) RequestContextHolder
                .getRequestAttributes();
        if (attributes != null) {
            HttpServletRequest request = attributes.getRequest();
            Enumeration<String> headerNames = request.getHeaderNames();
            if (headerNames != null) {
                while (headerNames.hasMoreElements()) {
                    String name = headerNames.nextElement();
                    String values = request.getHeader(name);
                    // 如果透传了原来的content-length会导致长度不一致，从而服务提供方出现
                    // Invalid character found in method name. HTTP method names must be tokens
                    if (!headNameList.contains(name)) {
                        template.header(name, values);
                    }
                }
            }
        }
    }

参考来源：http://blog.amoyiki.com/post/Spring-Cloud-4-Feign-slow.html