Firstsawyou commented on issue #3498:
URL: https://github.com/apache/apisix/issues/3498#issuecomment-772332757
> they are status code from my apisix log
> [root@ecs-551a apisix_log]# grep 'GET|POST' access.log |awk '{print
$10}'|sort -rn|uniq -c
>
> ```
> 37 502
> 1744 500
> 314 499
> 2 408
> 17238 404
> 166 403
> 26 401
> 101 400
> 1003 304
> 18417 302
> 30 301
> 75 206
> 7 201
> 611597 200
> ```
You should check whether the response data contains the header information
of `X-APISIX-Upstream-Status` in the 500 request. This header information can
help us troubleshoot the problem.
For example:
```
$ curl http://127.0.0.1:9080/hello -i
HTTP/1.1 500 Internal Server Error
Date: Wed, 03 Feb 2021 01:35:00 GMT
Content-Type: text/html; charset=utf-8
Content-Length: 154
Connection: keep-alive
Server: APISIX/2.2
X-APISIX-Upstream-Status: 500, 500
......
```
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