在做接口请求时,我们经常会在header头中增加一些鉴权信息,如token 或 jwt,那么在通过fegin从A server去调用B server的接口时,如果B server的接口需要header信息,我们需要将A sever获取的header转发到B上。

解决方式

我们需要实现Feign提供的一个接口RequestInterceptor

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@Configuration
public class FeignConfiguration implements RequestInterceptor{
private final Logger logger = LoggerFactory.getLogger(getClass());
@Override
public void apply(RequestTemplate template) {
ServletRequestAttributes attributes = (ServletRequestAttributes) RequestContextHolder
.getRequestAttributes();
HttpServletRequest request = attributes.getRequest();
Enumeration<String> headerNames = request.getHeaderNames();
if (headerNames != null) {
while (headerNames.hasMoreElements()) {
String name = headerNames.nextElement();
String values = request.getHeader(name);
template.header(name, values);

}
logger.info("feign interceptor header:{}",template);
}
}
}

@FeignClient注解里面的属性加上configuration = FeignConfiguration.class就可以了。如

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@FeignClient(value = "xinmusic-music",configuration = FeignConfig.class)
@RequestMapping("/music")
public interface MusicService {
//todo
}