使用微服務(wù)的架構(gòu)開(kāi)發(fā)的項(xiàng)目，需要時(shí)常調(diào)用其他服務(wù)的接口，@FeignClient默認(rèn)的設(shè)置會(huì)導(dǎo)致請(qǐng)求頭
head丟失，重寫(xiě)請(qǐng)求攔截器，將head頭信息放入到新請(qǐng)求當(dāng)中

@Configuration
public class FeignClientsConfig implements RequestInterceptor {
    @Override
    public void apply(RequestTemplate requestTemplate) {
        ServletRequestAttributes attributes = (ServletRequestAttributes) RequestContextHolder.getRequestAttributes();
        if (attributes == null) {
            return;
        }
        HttpServletRequest request = attributes.getRequest();
        Enumeration<String> headerNames = request.getHeaderNames();
        if (headerNames != null) {
            while (headerNames.hasMoreElements()) {
                String name = headerNames.nextElement();
                 //新請(qǐng)求會(huì)導(dǎo)致長(zhǎng)度改變，過(guò)濾
                if ("content-length".equalsIgnoreCase(name)) {
                    continue;
                }
                //防止傳遞格式修改，過(guò)濾
                if ("accept-encoding".equalsIgnoreCase(name)) {
                    continue;
                }
                String value = request.getHeader(name);
                requestTemplate.header(name, value);
            }
        }
    }
}