http-access-log 出错

[ap6108]

ERROR 03/17-03:19:56.618 http-access-log method=GET ip=127.0.0.1 path=/discovery/polls ts=30.00105143 traceid= err=-304 user=no_user params=appid=infra.discovery&env=dev&hostname=cloud1&latest_timestamp=1615864005461352591 stack=-304 ret=-304 msg=-304 timeout_quota=39.999991718
INFO 03/17-03:19:56.618 /home/avit/code/discovery/registry/registry.go:235 Polls from(cloud1) reuse connection(6)
INFO 03/17-03:19:56.625 /home/avit/code/discovery/registry/registry.go:382 DelConns from(cloud1) count decr(6)
ERROR 03/17-03:19:56.625 http-access-log params=appid=infra.discovery&env=dev&hostname=cloud1&latest_timestamp=1615864005461352591 traceid= ip=127.0.0.1 err=-304 ts=30.001147202 ret=-304 stack=-304 path=/discovery/polls user=no_user msg=-304 timeout_quota=39.999992338 method=GET
INFO 03/17-03:19:56.626 /home/avit/code/discovery/registry/registry.go:235 Polls from(cloud1) reuse connection(6)
INFO 03/17-03:19:56.648 /home/avit/code/discovery/registry/registry.go:382 DelConns from(cloud1) count decr(6)
INFO 03/17-03:19:56.648 /home/avit/code/discovery/registry/registry.go:385 DelConns from(cloud1) delete(1)
ERROR 03/17-03:19:56.648 http-access-log stack=-304 traceid= method=GET ret=-304 msg=-304 ts=30.001125872 ip=127.0.0.1 path=/discovery/polls err=-304 params=appid=infra.discovery&appid=goim.comet&env=dev&hostname=cloud1&latest_timestamp=1615864005461352591&latest_timestamp=1615865003212927403 user=no_user timeout_quota=39.999992267

请问这个出错是怎么发生的，然后应该怎么解决？

[yeqown]

-304 表示的是 ecode.NotModified ， 是在长轮询请求超时后，返回给客户端的错误码：https://github.com/bilibili/discovery/blob/master/http/discovery.go#L102-L112

至于这条错误日志，则是由 kratos/pkg/net/http/blademaster/logger.go 记录而来，因为论询请求返回了错误ecode.NotModified，但这并不代表服务出错了