SpringCloud-OpenFeign

cmyang2022-03-092023-05-14

openFeign向下传递请求头

OpenFeign在微服务间的调用向下传递请求头

思路：把请求头放在ThreadLocal里，feign调用时，把请求头取出来再传递给下个服务

方案：实现RequestInterceptor接口，该接口的作用是在feign调用时，给请求添加头信息

@Component
public class FeignRequestInterceptor implements RequestInterceptor {

    @Override
    public void apply(RequestTemplate template) {
        ServletRequestAttributes attributes = (ServletRequestAttributes) RequestContextHolder.getRequestAttributes();
        HttpServletRequest request = attributes.getRequest();
        Enumeration<String> headerNames = request.getHeaderNames();
        if (headerNames == null) {
            return;
        }
        while (headerNames.hasMoreElements()) {
            String name = headerNames.nextElement();
            String values = request.getHeader(name);
            template.header(name, values);
        }
    }
}