Unable to select local web server in UI - connection refused

[yiannis-p]

I am getting the following error displayed in an 'Oops!' error dialog and also logged to the console when I try to enter a local web server in the Web Page URL field:

DEBUG:urllib3.connectionpool:Starting new HTTP connection (1): localhost:8888
ERROR:Hidamari:[GUI] Failed to access http://localhost:8888/index2.html. Error:
HTTPConnectionPool(host='localhost', port=8888): Max retries exceeded with url: /index2.html (Caused by NewConnectionError('<urllib3.connection.HTTPConnection object at 0x7f055283f8e0>: Failed to establish a new connection: [Errno 111] Connection refused'))

However, if I manually edit the config file at ~/.var/app/io.github.jeffshee.Hidamari/config/hidamari/config.json and restart Hidamari, then the web page is displayed correctly.

Working config file for reference:

{
"version": 3,
"mode": "MODE_WEBPAGE",
"data_source": "http://localhost:8888/index2.html",
"is_mute": false,
"audio_volume": 50,
"is_static_wallpaper": true,
"static_wallpaper_blur_radius": 5,
"is_detect_maximized": true,
"fade_duration_sec": 1.5,
"fade_interval": 0.1,
"is_show_systray": false,
"is_first_time": false
}

Running Hidamari version 3.4 flatpak on Ubuntu.