[Blazor WebAssembly] `dotnet watch` may not inject `aspnetcore-browser-refresh.js` after `dotnet run` · Issue #59276 · dotnet/aspnetcore (original) (raw)

Is there an existing issue for this?

I have searched the existing issues

Describe the bug

dotnet watch may not inject the aspnetcore-browser-refresh.js script for Blazor WebAssesmbly standalone apps. This is because the cached result of index.html gets used, and this bypasses the script injection middleware.

For example, if you run a default Blazor WebAssembly standalone app first using dotnet run, then the response for index.html will not include the browser refresh script (which is expected). Subsequently running dotnet watch will result in that same index.html getting used (without the injected script). Clearing the browser cache results in the script injection middleware re-running, and hot reload will work as expected.

Note that:

This bug does not affect Blazor Web Apps
This does repro when running a .NET 8 app using either the .NET 9 or .NET 8 SDK.

Expected Behavior

Caching does not interfere with hot reload script injection, and dotnet watch works regardless of whether dotnet run was executed prior to it.

Steps To Reproduce

dotnet new blazorwasm
dotnet run
Open the app in the browser
Stop the app (ctrl+c)
dotnet watch
Open the app in the browser again
Observe that hot reload does not work
Observe that the aspnetcore-browser-refresh.js script was not injected into the document
Clear the browser's cache (Dev Tools -> Application -> Clear site data)
Refresh the page
Observe that the aspnetcore-browser-refresh.js script was injected into the document

Exceptions (if any)

No response

.NET Version

9.0.200-preview.0.24529.19

Anything else?

Was also able to repro using .NET SDK version 8.0.404.

Output of dotnet --info

.NET SDK:
 Version:           9.0.200-preview.0.24529.19
 Commit:            3980fbc52d
 Workload version:  9.0.200-manifests.c6f19616
 MSBuild version:   17.13.0-preview-24529-12+ee511a938

Runtime Environment:
 OS Name:     Windows
 OS Version:  10.0.22631
 OS Platform: Windows
 RID:         win-x64
 Base Path:   C:\Program Files\dotnet\sdk\9.0.200-preview.0.24529.19\

.NET workloads installed:
 [tvos]
   Installation Source: VS 17.13.35517.34
   Manifest Version:    18.0.9617/9.0.100
   Manifest Path:       C:\Program Files\dotnet\sdk-manifests\9.0.100\microsoft.net.sdk.tvos\18.0.9617\WorkloadManifest.json
   Install Type:              Msi

 [macos]
   Installation Source: VS 17.13.35517.34
   Manifest Version:    15.0.9617/9.0.100
   Manifest Path:       C:\Program Files\dotnet\sdk-manifests\9.0.100\microsoft.net.sdk.macos\15.0.9617\WorkloadManifest.json
   Install Type:              Msi

 [maui-windows]
   Installation Source: VS 17.13.35517.34
   Manifest Version:    9.0.0/9.0.100
   Manifest Path:       C:\Program Files\dotnet\sdk-manifests\9.0.100\microsoft.net.sdk.maui\9.0.0\WorkloadManifest.json
   Install Type:              Msi

 [maccatalyst]
   Installation Source: VS 17.13.35517.34
   Manifest Version:    18.0.9617/9.0.100
   Manifest Path:       C:\Program Files\dotnet\sdk-manifests\9.0.100\microsoft.net.sdk.maccatalyst\18.0.9617\WorkloadManifest.json
   Install Type:              Msi

 [ios]
   Installation Source: VS 17.13.35517.34
   Manifest Version:    18.0.9617/9.0.100
   Manifest Path:       C:\Program Files\dotnet\sdk-manifests\9.0.100\microsoft.net.sdk.ios\18.0.9617\WorkloadManifest.json
   Install Type:              Msi

 [android]
   Installation Source: VS 17.13.35517.34
   Manifest Version:    35.0.7/9.0.100
   Manifest Path:       C:\Program Files\dotnet\sdk-manifests\9.0.100\microsoft.net.sdk.android\35.0.7\WorkloadManifest.json
   Install Type:              Msi

 [wasm-tools-net6]
   Installation Source: VS 17.13.35517.34
   Manifest Version:    9.0.0/9.0.100
   Manifest Path:       C:\Program Files\dotnet\sdk-manifests\9.0.100\microsoft.net.workload.mono.toolchain.net6\9.0.0\WorkloadManifest.json
   Install Type:              Msi

 [wasm-tools-net7]
   Installation Source: VS 17.13.35517.34
   Manifest Version:    9.0.0/9.0.100
   Manifest Path:       C:\Program Files\dotnet\sdk-manifests\9.0.100\microsoft.net.workload.mono.toolchain.net7\9.0.0\WorkloadManifest.json
   Install Type:              Msi

 [wasm-tools-net8]
   Installation Source: VS 17.13.35517.34
   Manifest Version:    9.0.0/9.0.100
   Manifest Path:       C:\Program Files\dotnet\sdk-manifests\9.0.100\microsoft.net.workload.mono.toolchain.net8\9.0.0\WorkloadManifest.json
   Install Type:              Msi

 [wasm-tools]
   Installation Source: VS 17.13.35517.34
   Manifest Version:    9.0.0/9.0.100
   Manifest Path:       C:\Program Files\dotnet\sdk-manifests\9.0.100\microsoft.net.workload.mono.toolchain.current\9.0.0\WorkloadManifest.json
   Install Type:              Msi

 [aspire]
   Installation Source: VS 17.13.35517.34
   Manifest Version:    8.2.2/8.0.100
   Manifest Path:       C:\Program Files\dotnet\sdk-manifests\8.0.100\microsoft.net.sdk.aspire\8.2.2\WorkloadManifest.json
   Install Type:              Msi

Configured to use loose manifests when installing new manifests.

Host:
  Version:      9.0.0
  Architecture: x64
  Commit:       9d5a6a9aa4

.NET SDKs installed:
  8.0.404 [C:\Program Files\dotnet\sdk]
  9.0.100 [C:\Program Files\dotnet\sdk]
  9.0.200-preview.0.24529.19 [C:\Program Files\dotnet\sdk]

.NET runtimes installed:
  Microsoft.AspNetCore.All 2.1.30 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.All]
  Microsoft.AspNetCore.App 2.1.30 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 3.1.32 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 5.0.17 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 6.0.35 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 7.0.20 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 8.0.10 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 8.0.11 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 9.0.0-rc.2.24474.3 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 9.0.0 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.NETCore.App 2.1.30 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 3.1.32 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 5.0.17 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 6.0.35 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 7.0.20 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 8.0.10 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 8.0.11 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 9.0.0-rc.2.24473.5 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 9.0.0 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.WindowsDesktop.App 3.1.32 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
  Microsoft.WindowsDesktop.App 5.0.17 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
  Microsoft.WindowsDesktop.App 6.0.35 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
  Microsoft.WindowsDesktop.App 7.0.20 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
  Microsoft.WindowsDesktop.App 8.0.10 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
  Microsoft.WindowsDesktop.App 8.0.11 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
  Microsoft.WindowsDesktop.App 9.0.0-rc.2.24474.4 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
  Microsoft.WindowsDesktop.App 9.0.0 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]

Other architectures found:
  x86   [C:\Program Files (x86)\dotnet]
    registered at [HKLM\SOFTWARE\dotnet\Setup\InstalledVersions\x86\InstallLocation]

Environment variables:
  Not set

global.json file:
  Not found

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

Download .NET:
  https://aka.ms/dotnet/download

[Blazor WebAssembly] dotnet watch may not inject aspnetcore-browser-refresh.js after dotnet run · Issue #59276 · dotnet/aspnetcore (original) (raw)