Fixed the handling of empty http attributes in Batch Requests

src/Microsoft.OData.Core/JsonLight/ODataJsonLightBatchPayloadItemPropertiesCache.cs

@@ -273,7 +273,7 @@ private void ScanJsonProperties()
                                 while (this.jsonReader.NodeType != JsonNodeType.EndObject)
                                 {
                                     string headerName = this.jsonReader.ReadPropertyName();
-                                    string headerValue = this.jsonReader.ReadPrimitiveValue().ToString();
+                                    string headerValue = this.jsonReader.ReadPrimitiveValue()?.ToString();
 
                                     // Throw an ODataException, if a duplicate header was detected
                                     if (headers.ContainsKeyOrdinal(headerName))
@@ -425,7 +425,7 @@ await this.asynchronousJsonReader.ReadStartObjectAsync()
                             {
                                 string headerName = await this.asynchronousJsonReader.ReadPropertyNameAsync()
                                     .ConfigureAwait(false);
-                                string headerValue = (await this.asynchronousJsonReader.ReadPrimitiveValueAsync().ConfigureAwait(false)).ToString();
+                                string headerValue = (await this.asynchronousJsonReader.ReadPrimitiveValueAsync().ConfigureAwait(false))?.ToString();
 
                                 // Throw an ODataException, if a duplicate header was detected
                                 if (headers.ContainsKeyOrdinal(headerName))

test/FunctionalTests/Microsoft.OData.Core.Tests/JsonLight/ODataJsonLightBatchReaderTests.cs

@@ -363,6 +363,78 @@ await DoReadAsync(
                 isResponse: false);
         }
 
+        [Fact]
+        public void ReadBatchRequestWithNullHeaders()
+        {
+            var payload = "{\"requests\": [{" +
+                "\"id\": \"1\"," +
+                "\"method\": \"POST\"," +
+                "\"url\": \"http://tempuri.org/Customers\"," +
+                "\"headers\": {\"odata-version\":\"4.0\",\"content-type\":\"application/json;odata.metadata=minimal;odata.streaming=true;IEEE754Compatible=false;charset=utf-8\",\"null-header\":null}, " +
+                "\"body\": {\"@odata.type\":\"#NS.Customer\",\"Id\":1,\"Name\":\"Customer 1\",\"Type\":\"Retail\"}}]}";
+
+            SetupJsonLightBatchReaderAndRunTest(
+                payload,
+                (jsonLightBatchReader) =>
+                {
+                    try
+                    {
+                        while (jsonLightBatchReader.Read())
+                        {
+                            if (jsonLightBatchReader.State == ODataBatchReaderState.Operation)
+                            {
+                                var operationRequestMessage = jsonLightBatchReader.CreateOperationRequestMessage();
+                                // Verify that the Property "null-header" exists and it's value is set to NULL
+                                var nullHeaderProperty = operationRequestMessage.Headers.FirstOrDefault(p => p.Key == "null-header");
+                                Assert.NotNull(nullHeaderProperty.Key);
+                                Assert.Null(nullHeaderProperty.Value);
+                            }
+                        }
+                    }
+                    catch (NullReferenceException ex)
+                    {
+                        Assert.False(true, ex.Message);
+                    }
+                },
+                isResponse: false);
+        }
+
+        [Fact]
+        public async Task ReadBatchRequestWithNullHeadersAsync()
+        {
+            var payload = "{\"requests\": [{" +
+                "\"id\": \"1\"," +
+                "\"method\": \"POST\"," +
+                "\"url\": \"http://tempuri.org/Customers\"," +
+                "\"headers\": {\"odata-version\":\"4.0\",\"content-type\":\"application/json;odata.metadata=minimal;odata.streaming=true;IEEE754Compatible=false;charset=utf-8\",\"null-header\":null}, " +
+                "\"body\": {\"@odata.type\":\"#NS.Customer\",\"Id\":1,\"Name\":\"Customer 1\",\"Type\":\"Retail\"}}]}";
+
+            await SetupJsonLightBatchReaderAndRunTestAsync(
+                payload,
+                async (jsonLightBatchReader) =>
+                {
+                    try
+                    {
+                        while (await jsonLightBatchReader.ReadAsync())
+                        {
+                            if (jsonLightBatchReader.State == ODataBatchReaderState.Operation)
+                            {
+                                var operationRequestMessage = await jsonLightBatchReader.CreateOperationRequestMessageAsync();
+                                // Verify that the Property "null-header" exists and it's value is set to NULL
+                                var nullHeaderProperty = operationRequestMessage.Headers.FirstOrDefault(p => p.Key == "null-header");
+                                Assert.NotNull(nullHeaderProperty.Key);
+                                Assert.Null(nullHeaderProperty.Value);
+                            }
+                        }
+                    }
+                    catch (NullReferenceException ex)
+                    {
+                        Assert.False(true, ex.Message);
+                    }
+                },
+                isResponse: false);
+        }
+
         [Fact]
         public void ReadBatchRequestWithDuplicateProperties()
         {