ERR_CONNECTION_REFUSED in localhost after GC update to 87.0.4280.66 - google-chrome

Question

I work with Visual Studio 2017 and develop asp.net core (2.2) app’s.
I have set IIS-Express as dev webserver and Google Chrome as default browser.
In the project settings, I have set http://localhost:14300 as dev-url.
Since the last chrome update Version 87.0.4280.66 (at 19.11.2020) the app is compiled, the chrome browser is started, but the url seems to be changed “on the fly” from http://localhost:14300 (as defined) to https:localhost (without port).
Therefore, an error message is showed in the browser:
ERR_CONNECTION_REFUSED
The app is loaded - if I paste the url (http://localhost:14300) in another Browser or a new chrome tab, the app is loaded.
So.. I assume a bug in the latest Chrome update or a compatibility issue VS2017 <-> ISS Express <-> GC
I already have searched the Internet and found nothing yet (further, I already sent as issue to Google) .

Answer 1

According to your description, I guess you may set the launchSettings.json's IIS Express's launch Url to "https://localhost".
I suggest you could check it to make sure the launch Url is right.
More details about the launchSettings.json, you could refer to below codes:
{
"iisSettings": {
"windowsAuthentication": false,
"anonymousAuthentication": true,
"iisExpress": {
"applicationUrl": "http://localhost:5761",
"sslPort": 44365
}
},
"profiles": {
"IIS Express": {
"commandName": "IISExpress",
"launchBrowser": true,
"launchUrl": "https://localhost",
"environmentVariables": {
"ASPNETCORE_ENVIRONMENT": "Development"
}
},
"AngularCore31": {
"commandName": "Project",
"launchBrowser": true,
"applicationUrl": "https://localhost:5001;http://localhost:5000",
"environmentVariables": {
"ASPNETCORE_ENVIRONMENT": "Development"
}
}
}
}

Answer 2

It seems as I have found the issue (I see no context, but this has solved my problem):
Note: Here ( 1 ) was https://localhost showed (instead of http://localhost:14300 as on the screenshot below).
After launch with debug to IIS press the (i) ( 1 ) symbol
Then select "Website-Einstellungen" ( 2 ) (website settings)
Then, I had to delete ( 3 ) all data to the website (localhost)
After doing that, the debug url (http://localhost:14300) was loaded correct again.
So... (for me) it seems as the update to Chrome Version 87.0.4280.66 had a problem regarding the already stored data and then (for whatever reason) has redirected
http://localhost:14300
to
https:/localhost