serve blazor.web.js from wwwroot instead of setting up new endpoint to serve it (#10990)

Co-authored-by: Adam Ratzman <adam@adamratzman.com>

Author: JamesNK

Directory.Packages.props

@@ -212,7 +212,6 @@
     <PackageVersion Update="Microsoft.Extensions.Diagnostics.HealthChecks.EntityFrameworkCore" Version="$(MicrosoftExtensionsDiagnosticsHealthChecksEntityFrameworkCoreVersion)" />
     <PackageVersion Update="Microsoft.Extensions.Diagnostics.HealthChecks" Version="$(MicrosoftExtensionsDiagnosticsHealthChecksVersion)" />
     <PackageVersion Update="Microsoft.Extensions.Features" Version="$(MicrosoftExtensionsFeaturesVersion)" />
-    <PackageVersion Update="Microsoft.Extensions.FileProviders.Embedded" Version="$(MicrosoftExtensionsFileProvidersEmbeddedVersion)" />
     <PackageVersion Update="Microsoft.AspNetCore.SignalR.Client" Version="$(MicrosoftAspNetCoreSignalRClientVersion)" />
     <!-- Runtime -->
     <PackageVersion Update="Microsoft.Extensions.Hosting.Abstractions" Version="$(MicrosoftExtensionsHostingAbstractionsVersion)" />

eng/Versions.props

@@ -71,7 +71,6 @@
     <MicrosoftExtensionsDiagnosticsHealthChecksEntityFrameworkCoreVersion>9.0.7</MicrosoftExtensionsDiagnosticsHealthChecksEntityFrameworkCoreVersion>
     <MicrosoftExtensionsDiagnosticsHealthChecksVersion>9.0.7</MicrosoftExtensionsDiagnosticsHealthChecksVersion>
     <MicrosoftExtensionsFeaturesVersion>9.0.7</MicrosoftExtensionsFeaturesVersion>
-    <MicrosoftExtensionsFileProvidersEmbeddedVersion>9.0.7</MicrosoftExtensionsFileProvidersEmbeddedVersion>
     <MicrosoftAspNetCoreSignalRClientVersion>9.0.7</MicrosoftAspNetCoreSignalRClientVersion>
     <!-- Runtime -->
     <MicrosoftExtensionsHostingAbstractionsVersion>9.0.7</MicrosoftExtensionsHostingAbstractionsVersion>

src/Aspire.Dashboard/Aspire.Dashboard.csproj

@@ -19,8 +19,6 @@
     <RollForward>Major</RollForward>
 
     <DefineConstants>$(DefineConstants);ASPIRE_DASHBOARD</DefineConstants>
-
-    <GenerateEmbeddedFilesManifest>true</GenerateEmbeddedFilesManifest>
   </PropertyGroup>
 
   <PropertyGroup>
@@ -37,8 +35,6 @@
     <Protobuf Include="..\Aspire.Hosting\Dashboard\proto\dashboard_service.proto">
       <Link>ServiceClient\dashboard_service.proto</Link>
     </Protobuf>
-
-    <EmbeddedResource Include="Embedded\blazor.web.js" LogicalName="_aspire/blazor.web.js" />
   </ItemGroup>
 
   <!-- Used by publishing infrastructure to get the version to use for blob publishing -->
@@ -50,7 +46,6 @@
     <PackageReference Include="Markdig" />
     <PackageReference Include="Microsoft.AspNetCore.Authentication.Certificate" />
     <PackageReference Include="Microsoft.AspNetCore.Authentication.OpenIdConnect" />
-    <PackageReference Include="Microsoft.Extensions.FileProviders.Embedded" />
     <PackageReference Include="Microsoft.FluentUI.AspNetCore.Components" />
     <PackageReference Include="Microsoft.FluentUI.AspNetCore.Components.Icons" />
   </ItemGroup>

src/Aspire.Dashboard/Components/App.razor

@@ -29,11 +29,11 @@
     <Routes @rendermode="@(new InteractiveServerRenderMode(prerender: false))" />
     <ReconnectModal />
     @*
-        Use Blazor JS embedded in dashboard. This is done because the dashboard is currently built for .NET 8, and in .NET 8 the Blazor JS is embedded in the components assembly.
+        Use Blazor JS shipped in dashboard's wwwroot. This is done because the dashboard is currently built for .NET 8, and in .NET 8 the Blazor JS is embedded in the components assembly.
         But in .NET 10 and later the Blazor JS file is an asset. We can rely on Blazor JS always being available. Remove and use asset file in the future once .NET 10 is the minimum version.
         This file is copied from .NET 10 P4.
     *@
-    <script src="_aspire/blazor.web.js"></script>
+    <script src="framework/blazor.web.js"></script>
     <script src="js/app.js"></script>
     <script src="js/app-reconnect.js"></script>
 

src/Aspire.Dashboard/DashboardEndpointsBuilder.cs

@@ -8,54 +8,12 @@
 using Microsoft.AspNetCore.Authentication.OpenIdConnect;
 using Microsoft.AspNetCore.Localization;
 using Microsoft.AspNetCore.Mvc;
-using Microsoft.AspNetCore.StaticFiles;
-using Microsoft.Extensions.FileProviders;
 using Microsoft.Extensions.Options;
-using Microsoft.Net.Http.Headers;
 
 namespace Aspire.Dashboard;
 
 public static class DashboardEndpointsBuilder
 {
-    public static void MapDashboardBlazor(this IEndpointRouteBuilder endpoints)
-    {
-        var options = new StaticFileOptions
-        {
-            FileProvider = new ManifestEmbeddedFileProvider(typeof(DashboardEndpointsBuilder).Assembly),
-            OnPrepareResponse = SetCacheHeaders
-        };
-
-        var app = endpoints.CreateApplicationBuilder();
-        app.Use(next => context =>
-        {
-            // Set endpoint to null so the static files middleware will handle the request.
-            context.SetEndpoint(null);
-
-            return next(context);
-        });
-        app.UseStaticFiles(options);
-
-        endpoints.MapGet("/_aspire/blazor.web.js", app.Build());
-
-        static void SetCacheHeaders(StaticFileResponseContext ctx)
-        {
-            // By setting "Cache-Control: no-cache", we're allowing the browser to store
-            // a cached copy of the response, but telling it that it must check with the
-            // server for modifications (based on Etag) before using that cached copy.
-            // Longer term, we should generate URLs based on content hashes (at least
-            // for published apps) so that the browser doesn't need to make any requests
-            // for unchanged files.
-            var headers = ctx.Context.Response.GetTypedHeaders();
-            if (headers.CacheControl == null)
-            {
-                headers.CacheControl = new CacheControlHeaderValue
-                {
-                    NoCache = true
-                };
-            }
-        }
-    }
-
     public static void MapDashboardHealthChecks(this IEndpointRouteBuilder endpoints)
     {
         endpoints.MapHealthChecks($"/{DashboardUrls.HealthBasePath}").AllowAnonymous();

src/Aspire.Dashboard/DashboardWebApplication.cs

@@ -444,7 +444,6 @@ public DashboardWebApplication(
 
         _app.MapDashboardApi(dashboardOptions);
         _app.MapDashboardHealthChecks();
-        _app.MapDashboardBlazor();
     }
 
     private ILogger<DashboardWebApplication> GetLogger()