tokers opened a new pull request #2548:
URL: https://github.com/apache/apisix/pull/2548
### What this PR does / why we need it:
Support the TLS connection when communicating with etcd cluster. We added a
configuration item to custom the certificate verification. Whether to setup TLS
connection or not depends on the endpoints' scheme, for instance, when
endpoints are:
```
etcd:
host:
- "https://127.0.0.1:2379";
- "https://127.0.0.1:3379";
```
APISIX will originate TLS connection automatically, and the Server Name
Indication extention will be set by the endpoint host (`127.0.0.1` in above
case).
This PR depends on https://github.com/api7/lua-resty-etcd/pull/86.
### Pre-submission checklist:
* [x] Did you explain what problem does this PR solve? Or what new features
have been added?
* [ ] Have you added corresponding test cases?
* [ ] Have you modified the corresponding document?
* [x] Is this PR backward compatible?
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