request help: "ext-plugin-post-resp" plugin use https upstream service response 502 bad gateway

### Issue description

When I use http upstream, the plugin works normally.
Not working properly when using https.
error logs in the log： "unable to get local issuer certificate",
It seems that upstream needs to verify the certificate. How can I bypass the certificate?

err log:

2023/11/23 07:05:04 [error] 70#70: *141105 [lua] ext-plugin-post-resp.lua:153: phase_func(): failed to request: 20: unable to get local issuer certificate, client: 172.19.0.1, server: _, request: "GET /api/v1/code HTTP/1.1", host: "127.0.0.1:9443"
2023/11/23 07:05:04 [error] 70#70: *141105 [lua] ext-plugin-post-resp.lua:49: close(): close http object failed: closed, client: 172.19.0.1, server: _, request: "GET /api/v1/code HTTP/1.1", host: "127.0.0.1:9443"
2023/11/23 07:05:04 [warn] 70#70: *141105 [lua] plugin.lua:1107: run_plugin(): ext-plugin-post-resp exits with http status code 502, client: 172.19.0.1, server: _, request: "GET /api/v1/code HTTP/1.1", host: "127.0.0.1:9443"

### Environment

docker
apisix == 3.6.0

* your apisix-java-plugin-runner version

apisix-java-plugin-runner version == 0.4.0