tzssangglass commented on issue #6418:
URL: https://github.com/apache/apisix/issues/6418#issuecomment-1213313531
> 我了解，但这样的话只能配置一个ca证书，如果有多个上游，并且多个上游使用不同的ca证书进行签发，这里只能满足配置一个。
We can use this way:
https://github.com/apache/apisix/blob/master/docs/zh/latest/certificate.md#%E8%AE%BE%E7%B
tzssangglass commented on issue #6418:
URL: https://github.com/apache/apisix/issues/6418#issuecomment-1212885278
> 在upstream中只配置了client_cert和client_key，却没有client_ca字段，
IMO, The CA certificate used for the mTLS connection between APISIX and
upstream is
```yaml
apisix:
s
