SpringCloud（五)微服务网关Zuul之头信息经过网关丢失解决

解决思路

只要在过滤器中获取到需要的头信息让后再将其向下转发就可以了。
具体的zuul过滤器代码如下：
zuul网关中过滤器内容介绍

package com.diplomaproject.web.filter;

import com.netflix.zuul.ZuulFilter;
import com.netflix.zuul.context.RequestContext;
import com.netflix.zuul.exception.ZuulException;
import org.springframework.stereotype.Component;

import javax.servlet.http.HttpServletRequest;
@Component
public class WebFilter extends ZuulFilter {
    @Override
    public String filterType() {
        return "pre";
    }

    @Override
    public int filterOrder() {
        return 0;
    }

    @Override
    public boolean shouldFilter() {
        return true;
    }

    @Override
    public Object run() throws ZuulException {
        //得到request上下文
        RequestContext currentContext = RequestContext.getCurrentContext();
        //得到request域
        HttpServletRequest request = currentContext.getRequest();
        //得到头信息（填写你需要的头信息）
        String authorization = request.getHeader("Authorization");
        System.out.println("webfilter中获得的头信息="+authorization);
        //判断是否有
        if(authorization!=null&&"".equals(authorization)) {
            //将头信息继续向下传送
            currentContext.addZuulRequestHeader("Authorization",authorization);
        }
        return null;
    }
}