.NET: Fix HuggingFace embedding generation 404 error by updating to router.huggingface.co endpoint

dotnet/samples/Demos/TelemetryWithAppInsights/Program.cs

@@ -392,7 +392,7 @@ private static Kernel GetKernel(ILoggerFactory loggerFactory)
         {
             builder.AddHuggingFaceChatCompletion(
                 model: TestConfiguration.HuggingFace.ModelId,
-                endpoint: new Uri("https://api-inference.huggingface.co"),
+                endpoint: new Uri("https://router.huggingface.co/hf-inference"),
                 apiKey: TestConfiguration.HuggingFace.ApiKey,
                 serviceId: HuggingFaceServiceKey);
         }

dotnet/src/Connectors/Connectors.HuggingFace.UnitTests/Services/HuggingFaceChatCompletionTests.cs

@@ -141,7 +141,7 @@ public async Task DefaultAddressShouldBeUsedAsync()
         await sut.GetChatMessageContentAsync(chatHistory);
 
         //Assert
-        Assert.StartsWith("https://api-inference.huggingface.co/", this._messageHandlerStub.RequestUri?.AbsoluteUri, StringComparison.OrdinalIgnoreCase);
+        Assert.StartsWith("https://router.huggingface.co/hf-inference/", this._messageHandlerStub.RequestUri?.AbsoluteUri, StringComparison.OrdinalIgnoreCase);
     }
 
     [Fact]

dotnet/src/Connectors/Connectors.HuggingFace.UnitTests/Services/HuggingFaceEmbeddingGenerationTests.cs

@@ -39,7 +39,7 @@ public async Task SpecifiedModelShouldBeUsedAsync()
         await sut.GenerateEmbeddingsAsync([]);
 
         //Assert
-        Assert.EndsWith("/fake-model", this._messageHandlerStub.RequestUri?.AbsoluteUri, StringComparison.OrdinalIgnoreCase);
+        Assert.Contains("/fake-model/", this._messageHandlerStub.RequestUri?.AbsoluteUri, StringComparison.OrdinalIgnoreCase);
     }
 
     [Fact]
@@ -98,7 +98,7 @@ public async Task ModelUrlShouldBeBuiltSuccessfullyAsync()
         await sut.GenerateEmbeddingsAsync([]);
 
         //Assert
-        Assert.Equal("https://fake-random-test-host/fake-path/pipeline/feature-extraction/fake-model", this._messageHandlerStub.RequestUri?.AbsoluteUri);
+        Assert.Equal("https://fake-random-test-host/fake-path/models/fake-model/pipeline/feature-extraction", this._messageHandlerStub.RequestUri?.AbsoluteUri);
     }
 
     [Fact]

dotnet/src/Connectors/Connectors.HuggingFace.UnitTests/Services/HuggingFaceEmbeddingGeneratorTests.cs

@@ -39,7 +39,7 @@ public async Task SpecifiedModelShouldBeUsedAsync()
         await sut.GenerateAsync([]);
 
         //Assert
-        Assert.EndsWith("/fake-model", this._messageHandlerStub.RequestUri?.AbsoluteUri, StringComparison.OrdinalIgnoreCase);
+        Assert.Contains("/fake-model/", this._messageHandlerStub.RequestUri?.AbsoluteUri, StringComparison.OrdinalIgnoreCase);
     }
 
     [Fact]
@@ -98,7 +98,7 @@ public async Task ModelUrlShouldBeBuiltSuccessfullyAsync()
         await sut.GenerateAsync([]);
 
         //Assert
-        Assert.Equal("https://fake-random-test-host/fake-path/pipeline/feature-extraction/fake-model", this._messageHandlerStub.RequestUri?.AbsoluteUri);
+        Assert.Equal("https://fake-random-test-host/fake-path/models/fake-model/pipeline/feature-extraction", this._messageHandlerStub.RequestUri?.AbsoluteUri);
     }
 
     [Fact]

dotnet/src/Connectors/Connectors.HuggingFace.UnitTests/Services/HuggingFaceImageToTextTests.cs

@@ -134,7 +134,7 @@ public async Task DefaultAddressShouldBeUsedAsync()
         await sut.GetTextContentsAsync(this._imageContentInput);
 
         //Assert
-        Assert.StartsWith("https://api-inference.huggingface.co/models", this._messageHandlerStub.RequestUri?.AbsoluteUri, StringComparison.OrdinalIgnoreCase);
+        Assert.StartsWith("https://router.huggingface.co/hf-inference/models", this._messageHandlerStub.RequestUri?.AbsoluteUri, StringComparison.OrdinalIgnoreCase);
     }
 
     [Fact]

dotnet/src/Connectors/Connectors.HuggingFace.UnitTests/Services/HuggingFaceTextGenerationTests.cs

@@ -129,7 +129,7 @@ public async Task DefaultAddressShouldBeUsedAsync()
         await sut.GetTextContentsAsync("fake-text");
 
         //Assert
-        Assert.StartsWith("https://api-inference.huggingface.co/models", this._messageHandlerStub.RequestUri?.AbsoluteUri, StringComparison.OrdinalIgnoreCase);
+        Assert.StartsWith("https://router.huggingface.co/hf-inference/models", this._messageHandlerStub.RequestUri?.AbsoluteUri, StringComparison.OrdinalIgnoreCase);
     }
 
     [Fact]

dotnet/src/Connectors/Connectors.HuggingFace/Core/HuggingFaceClient.cs

@@ -44,7 +44,7 @@ internal HuggingFaceClient(
             throw new InvalidOperationException("A valid model id or endpoint must be provided.");
         }
 
-        endpoint ??= new Uri("https://api-inference.huggingface.co");
+        endpoint ??= new Uri("https://router.huggingface.co/hf-inference");
         this.Separator = endpoint.AbsolutePath.EndsWith("/", StringComparison.InvariantCulture) ? string.Empty : "/";
         this.Endpoint = endpoint;
         this.ModelId = modelId;
@@ -300,7 +300,7 @@ public async Task<IList<ReadOnlyMemory<float>>> GenerateEmbeddingsAsync(
     }
 
     private Uri GetEmbeddingGenerationEndpoint(string? modelId)
-        => string.IsNullOrWhiteSpace(modelId) ? this.Endpoint : new($"{this.Endpoint}{this.Separator}pipeline/feature-extraction/{modelId}");
+        => string.IsNullOrWhiteSpace(modelId) ? this.Endpoint : new($"{this.Endpoint}{this.Separator}models/{modelId}/pipeline/feature-extraction");
 
     #endregion