### What problem does this PR solve?
```
____ __ _
/ _/ ____ ____ _ ___ _____ / /_ (_) ____ ____ _____ ___ _____ _ __ ___ _____
/ / / __ \ / __ `/ / _ \ / ___/ / __/ / / / __ \ / __ \ / ___/ / _ \ / ___/| | / / / _ \ / ___/
_/ / / / / / / /_/ / / __/ (__ ) / /_ / / / /_/ / / / / / (__ ) / __/ / / | |/ / / __/ / /
/___/ /_/ /_/ \__, / \___/ /____/ \__/ /_/ \____/ /_/ /_/ /____/ \___/ /_/ |___/ \___/ /_/
/____/
```
### Type of change
- [x] Refactoring
Signed-off-by: Jin Hai <haijin.chn@gmail.com>
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|---|---|---|
| .. | ||
| cache_file_svr.py | ||
| discord_svr.py | ||
| jina_server.py | ||
| task_executor.py | ||