c# - When I run the application it runs on two ports

Question

I'm developing a web app with C#. Whenever I run the application using Visual Studio, two browser tabs open and the application runs on two ports: one of them is the correct one - the one with a portnumber that I specified. The other is unwanted and its portnumber is different every time I run it (I think VS looks at the next available port).

Does anyone know where the latter can be configured? I only want the application to run on the specified portnumber.

This is part of launchSettings.json where I've specified the sslPort:

{
  "iisSettings": {
    "windowsAuthentication": false,
    "anonymousAuthentication": true,
    "iisExpress": {
     "applicationUrl": "http://localhost:44646",
     "sslPort": 44368
    }
  },
  "profiles": {
    "IIS Express": {
      "commandName": "IISExpress",
      "launchBrowser": true,
      "environmentVariables": {
        "ASPNETCORE_ENVIRONMENT": "Development"
      }
    },
    "Cassys.App": {
      "commandName": "Project",
      "launchBrowser": true,
      "environmentVariables": {
        "ASPNETCORE_ENVIRONMENT": "Development"
      },
     "applicationUrl": "https://localhost:5001;http://localhost:5000"
    }
  }
}

The port 44368 works and is correct. But somehow another browser-tab is opened with a different portnumber every time.

Edit: as requested by @Zhi Lv in comment section, here's the launch.json:

{
linkid=830387
    "version": "0.2.0",
    "configurations": [
        {
            "name": ".NET Core Launch (web)",
            "type": "coreclr",
            "request": "launch",
            "preLaunchTask": "build",
            // If you have changed target frameworks, make sure to update the program path.
            "program": "${workspaceFolder}/bin/Debug/netcoreapp3.1/WebApi.dll",
            "args": [],
            "cwd": "${workspaceFolder}",
            "stopAtEntry": false,
            "internalConsoleOptions": "openOnSessionStart",
            "env": {
                "ASPNETCORE_ENVIRONMENT": "Development",
                "ASPNETCORE_URLS": "localhost:44368"
            },
            "sourceFileMap": {
                "/Views": "${workspaceFolder}/Views"
            }
         },
        {
             "name": ".NET Core Attach",
             "type": "coreclr",
             "request": "attach",
             "processId": "${command:pickProcess}"
        }
    ]
  }

Answer 1

等待大神答复