[Static Web Assets] Allow assets with empty base paths

Author: javiercn

src/Hosting/Hosting/src/StaticWebAssets/StaticWebAssetsFileProvider.cs

@@ -46,6 +46,11 @@ public IDirectoryContents GetDirectoryContents(string subpath)
         {
             var modifiedSub = NormalizePath(subpath);
 
+            if (BasePath == "/")
+            {
+                return InnerProvider.GetDirectoryContents(modifiedSub);
+            }
+
             if (StartsWithBasePath(modifiedSub, out var physicalPath))
             {
                 return InnerProvider.GetDirectoryContents(physicalPath.Value);
@@ -67,6 +72,11 @@ public IFileInfo GetFileInfo(string subpath)
         {
             var modifiedSub = NormalizePath(subpath);
 
+            if (BasePath == "/")
+            {
+                return InnerProvider.GetFileInfo(subpath);
+            }
+
             if (!StartsWithBasePath(modifiedSub, out var physicalPath))
             {
                 return new NotFoundFileInfo(subpath);

src/Hosting/Hosting/test/StaticWebAssets/StaticWebAssetsFileProviderTests.cs

@@ -117,6 +117,35 @@ public void StaticWebAssetsFileProvider_FindsFileWithSpaces()
             Assert.True(provider.GetFileInfo("/_content/Static Web Assets.txt").Exists);
         }
 
+        [Fact]
+        public void GetDirectoryContents_HandlesEmptyBasePath()
+        {
+            // Arrange
+            var provider = new StaticWebAssetsFileProvider("/",
+                Path.Combine(AppContext.BaseDirectory, "testroot", "wwwroot"));
+
+            // Act
+            var directory = provider.GetDirectoryContents("/Static Web/");
+
+            // Assert
+            Assert.Collection(directory,
+                file =>
+                {
+                    Assert.Equal("Static Web.txt", file.Name);
+                });
+        }
+
+        [Fact]
+        public void StaticWebAssetsFileProviderWithEmptyBasePath_FindsFile()
+        {
+            // Arrange & Act
+            var provider = new StaticWebAssetsFileProvider("/",
+                Path.Combine(AppContext.BaseDirectory, "testroot", "wwwroot"));
+
+            // Assert
+            Assert.True(provider.GetFileInfo("/Static Web Assets.txt").Exists);
+        }
+
         [Fact]
         public void GetFileInfo_DoesNotMatch_IncompletePrefixSegments()
         {