Update Microsoft.AspNetCore.Watch.BrowserRefresh to net8.0 (#47509)

Co-authored-by: dotnet-maestro[bot] <dotnet-maestro[bot]@users.noreply.github.com>
Co-authored-by: Viktor Hofer <[email protected]>

Author: 3 people

eng/Version.Details.xml

@@ -506,9 +506,9 @@
       <SourceBuild RepoName="source-build-externals" ManagedOnly="true" />
     </Dependency>
     <!-- Intermediate is necessary for source build. -->
-    <Dependency Name="Microsoft.SourceBuild.Intermediate.source-build-reference-packages" Version="10.0.616001">
+    <Dependency Name="Microsoft.SourceBuild.Intermediate.source-build-reference-packages" Version="10.0.616401">
       <Uri>https://github.com/dotnet/source-build-reference-packages</Uri>
-      <Sha>8f9f6fa14523b2f2475ea0a86be1cf60b5de5336</Sha>
+      <Sha>c3d4c372a15c2de79a2f26fe2b6b3644996d8550</Sha>
       <SourceBuild RepoName="source-build-reference-packages" ManagedOnly="true" />
     </Dependency>
     <Dependency Name="Microsoft.Deployment.DotNet.Releases" Version="2.0.0-preview.1.25124.1">

src/BuiltInTools/BrowserRefresh/BrowserRefreshMiddleware.cs

@@ -82,7 +82,7 @@ private void AttachWebAssemblyHeaders(HttpContext context)
                 {
                     if (_dotnetModifiableAssemblies != null)
                     {
-                        context.Response.Headers.Add("DOTNET-MODIFIABLE-ASSEMBLIES", _dotnetModifiableAssemblies);
+                        context.Response.Headers.Append("DOTNET-MODIFIABLE-ASSEMBLIES", _dotnetModifiableAssemblies);
                     }
                     else
                     {
@@ -98,7 +98,7 @@ private void AttachWebAssemblyHeaders(HttpContext context)
                 {
                     if (_aspnetcoreBrowserTools != null)
                     {
-                        context.Response.Headers.Add("ASPNETCORE-BROWSER-TOOLS", _aspnetcoreBrowserTools);
+                        context.Response.Headers.Append("ASPNETCORE-BROWSER-TOOLS", _aspnetcoreBrowserTools);
                     }
                     else
                     {

src/BuiltInTools/BrowserRefresh/Microsoft.AspNetCore.Watch.BrowserRefresh.csproj

@@ -1,7 +1,8 @@
-<Project Sdk="Microsoft.NET.Sdk">
+<Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
-    <!-- Intentionally pinned. This feature is supported in projects targeting 6.0 or newer.-->
-    <TargetFramework>net6.0</TargetFramework>
+    <!-- Intentionally pinned. This feature is supported in projects targeting 8.0 or newer.-->
+    <!-- This should always use the oldest supported TFM -->
+    <TargetFramework>net8.0</TargetFramework>
     <StrongNameKeyId>MicrosoftAspNetCore</StrongNameKeyId>
 
     <IsPackable>false</IsPackable>
@@ -16,9 +17,9 @@
   </ItemGroup>
 
   <ItemGroup Condition="'$(DotNetBuildSourceOnly)' == 'true'">
-    <!-- Reference 6.0.2 targeting packs in Source Build - this was the earliest version after the API surface stabilized -->
-    <FrameworkReference Update="Microsoft.AspNetCore.App" TargetingPackVersion="6.0.2" />
-    <FrameworkReference Update="Microsoft.NETCore.App" TargetingPackVersion="6.0.2" />
+    <!-- Reference 8.0.0 targeting packs in Source Build -->
+    <FrameworkReference Update="Microsoft.AspNetCore.App" TargetingPackVersion="8.0.0" />
+    <FrameworkReference Update="Microsoft.NETCore.App" TargetingPackVersion="8.0.0" />
   </ItemGroup>
 
   <ItemGroup>