URL host too long issue

When the socket file path is longer than 64, the code will fail at encoding.idna.encode with error UnicodeError. It might be good to translate url  from

```
http+unix://very_long_path_with_socket_file_name/...
```

into
```
http+unix://some_special_url_location/...
```

and store the `very_long_path_with_socket_file_name` somewhere else.