asyncpg error: “no pg_hba.conf entry for host” in Heroku

还没有人认领这个 Issue。

I'm using asyncpg to connect my database in Heroku postgresql, using python:

```
import asyncpg

async def create_db_pool():
bot.pg_con = await asyncpg.create_pool(dsn="postgres://....", host="....amazonaws.com", user="xxx", database="yyy", port="5432", password="12345")
```

it was working perfectly until I received an email from heroku advising me of a maintenance:
`Maintenance (DATABASE_URL on myappname) is starting now. We will update you when it has completed.`

then this error appeared:

`asyncpg.exceptions.InvalidAuthorizationSpecificationError: no pg_hba.conf entry for host "123.456.789.10", user "xxx", database "yyy", SSL off`

I tried to follow some help, like putting ssl=True but this error appeared:

`ssl.SSLCertVerificationError: [SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed: self signed certificate (_ssl.c:1108)`

same as putting ssl="allow"

`asyncpg.exceptions.InvalidPasswordError: password authentication failed for user "xxx"`

what can I do to fix this?

https://stackoverflow.com/questions/62053185/asyncpg-error-no-pg-hba-conf-entry-for-host-in-heroku

未指定项目文件或测试。首先检查 asyncpg.create_pool 调用、Heroku PostgreSQL 维护通知以及三个连接错误；确定该故障是否能在 asyncpg 中复现，还是仅特定于 Heroku 数据库配置，并以经过验证的连接结果作为完成标准。

由索引模型根据 Issue 内容生成。