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如何和将原始request的Header中的值传递给openfeign请求的Header

参考 https://www.jb51.net/article/282522.htm

借助 @RequestHeader注解

通过实现 RequestInterceptor 接口

示例（实现RequestInterceptor ）

主要代码：

import javax.servlet.http.HttpServletRequest;import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.context.request.RequestContextHolder;
import org.springframework.web.context.request.ServletRequestAttributes;import feign.RequestInterceptor;
import feign.RequestTemplate;
import io.micrometer.core.instrument.util.StringUtils;
import io.seata.core.context.RootContext;@Configuration
public class ComonConfig {@Beanpublic RequestInterceptor requestInterceptor() {return new RequestInterceptor() {@Overridepublic void apply(RequestTemplate requestTemplate) {ServletRequestAttributes attributes = (ServletRequestAttributes) RequestContextHolder.getRequestAttributes();HttpServletRequest request = attributes.getRequest(); // 老 request// 从Seata获取XID，并将其添加到Feign请求header中String xid = RootContext.getXID();if (xid != null) {requestTemplate.header("TX_XID", xid);}requestTemplate.header("Cookie", request.getHeader("Cookie")); // 新requestrequestTemplate.header("Platform", request.getHeader("Platform")); String pageSizeDefault = "20";String pageNumDefalut = "1";String pageSize = request.getParameter("pageSize");String pageNum = request.getParameter("pageNum");if (StringUtils.isNotEmpty(pageSize)) {pageSizeDefault = pageSize;}if (StringUtils.isNotEmpty(pageNum)) {pageNumDefalut = pageNum;}requestTemplate.header("pageSize", pageSizeDefault);requestTemplate.header("pageNum", pageNumDefalut);
//				requestTemplate.header("Accept", "application/json;charset=UTF-8");
//				requestTemplate.header("Content-Type", "application/json;charset=UTF-8");}};}
}

以上解释： 首先，这是一个拦截器用于拦截openfeign的请求；然后，在apply方法中通过Spring包装的请求获取原始请求，并从请求中获取到Header,如名称为‘Platform’的Header,如下：

ServletRequestAttributes attributes = (ServletRequestAttributes)RequestContextHolder.getRequestAttributes();
HttpServletRequest request = attributes.getRequest();
request.getHeader("Platform");

最后，将取出来的Header的值，设置到openfeign请求RequestTemplate 的Header中去如下：

requestTemplate.header("Platform", request.getHeader("Platform"))

设置好了，那如何取出来openfeign请求中的Header中的值？，如下

如何获取openfeign请求中Header中的值

还是使用Spring管理的request来取！有两种方式

1. 直接通过RequestContextHolder来获取

HttpServletRequest request = ((ServletRequestAttributes) RequestContextHolder.getRequestAttributes()).getRequest();request.getHeader("Platform");

3. 注入方式

import javax.servlet.http.HttpServletRequest;@Autowiredprivate HttpServletRequest request;// 直接使用request.getHeader("Platform");即可