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Blazor project creation: Default$b.interval in bootstrap.bundle.js is being set to the port number #48811

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@rough-street

Description

@rough-street

Describe the bug

When I create a new blazorwasm standalone app and look at the generated files, I see that the value of Default$b.interval in projectname/wwwroot/lib/bootstrap/dist/js/bootstrap.bundle.js:1131 has been set to the same value as the port in the url set in projectname/Properties/launchSettings.json:9 at "profiles"->"http"->"applicationUrl"

This is not just a coincedence - when another project is created and is automatically given a different port number in launchSettings.json, again Default$b.interval is assigned this new port number.

To Reproduce

Run dotnet new blazorwasm -o projectname on Linux (I haven't tried Windows).
Examine the above files and see that values match.
Delete the project and recreate.
Note that the port number at projectname/Properties/launchSettings.json:9 is now different (fine) and that the Default$b.interval now is assigned the new port number.

Exceptions (if any)

None

Further technical details

Output of dotnet --info

.NET SDK:
Version: 9.0.104
Commit: 7931ad4860
Workload version: 9.0.100-manifests.dc2cb94f
MSBuild version: 17.12.27+7931ad486

Runtime Environment:
OS Name: ubuntu
OS Version: 22.04
OS Platform: Linux
RID: ubuntu.22.04-x64
Base Path: /usr/lib/dotnet/sdk/9.0.104/

.NET workloads installed:
[wasm-tools]
Installation Source: SDK 9.0.100
Manifest Version: 9.0.3/9.0.100
Manifest Path: /usr/lib/dotnet/sdk-manifests/9.0.100/microsoft.net.workload.mono.toolchain.current/9.0.3/WorkloadManifest.json
Install Type: FileBased

Configured to use loose manifests when installing new manifests.

Host:
Version: 9.0.3
Architecture: x64
Commit: 7931ad4860

.NET SDKs installed:
8.0.115 [/usr/lib/dotnet/sdk]
9.0.104 [/usr/lib/dotnet/sdk]

.NET runtimes installed:
Microsoft.AspNetCore.App 8.0.15 [/usr/lib/dotnet/shared/Microsoft.AspNetCore.App]
Microsoft.AspNetCore.App 9.0.3 [/usr/lib/dotnet/shared/Microsoft.AspNetCore.App]
Microsoft.NETCore.App 8.0.15 [/usr/lib/dotnet/shared/Microsoft.NETCore.App]
Microsoft.NETCore.App 9.0.3 [/usr/lib/dotnet/shared/Microsoft.NETCore.App]

Other architectures found:
None

Environment variables:
Not set

global.json file:
Not found

Learn more:
https://aka.ms/dotnet/info

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https://aka.ms/dotnet/download

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Area-AspNetCoreRazorSDK, BlazorWebAssemblySDK, dotnet-watchuntriagedRequest triage from a team member

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