Fix batch failed with relative url & Content-Transfer-Encoding have duplicate binary

PanoramicData.OData.Client.Test/UnitTests/NestedExpandExpressionTests.cs

@@ -50,7 +50,7 @@ public void Expand_WithSingleNestedProperty_ProducesNestedExpandSyntax()
 	/// Tests that multiple independent expands still work correctly.
 	/// </summary>
 	[Fact]
-	public void Expand_WithMultipleIndependentProperties_ProducesCommaSepa�ratedExpands()
+	public void Expand_WithMultipleIndependentProperties_ProducesCommaSeparatedExpands()
 	{
 		// Arrange
 		var builder = new ODataQueryBuilder<Person>("People", NullLogger.Instance);

PanoramicData.OData.Client.Test/UnitTests/ODataBatchBuilderTests.cs

@@ -1,3 +1,5 @@
+using System.Net.Http.Headers;
+
 namespace PanoramicData.OData.Client.Test.UnitTests;
 
 /// <summary>
@@ -36,6 +38,30 @@ public void Dispose()
 		GC.SuppressFinalize(this);
 	}
 
+	/// <summary>
+	/// Verifies that the HTTP content written to the stream includes the required headers
+	/// </summary>
+	[Fact]
+	public async Task WriteToStreamAsync_ShouldIncludeRequiredHeaders()
+	{
+		using var request = new HttpRequestMessage(HttpMethod.Post, "http://test.org/Customers");
+		request.Content = new StringContent("{\"Name\":\"Test\"}");
+		request.Content.Headers.ContentType = new MediaTypeHeaderValue("application/json");
+
+		using var content = new HttpMessageContent(request);
+
+		// Act
+		var resultString = await content.ReadAsStringAsync(TestContext.Current.CancellationToken);
+
+		// Assert: Check the HttpContent headers specifically
+		content.Headers.TryGetValues("Content-Transfer-Encoding", out var values);
+		values.Should().Contain("binary");
+
+		// Assert: Check the serialized string content
+		resultString.Should().Contain("POST /Customers HTTP/1.1");
+		resultString.Should().Contain("Content-Type: application/json");
+	}
+
 	#region Get Operation Tests
 
 	/// <summary>

PanoramicData.OData.Client.Test/UnitTests/ODataCrossJoinTests.cs

@@ -113,14 +113,15 @@ public void CrossJoin_MultipleEntitySets_ShouldIncludeAll()
 	}
 
 	[Fact]
-	public async Task CrossJoin_LessThanTwoEntitySets_ShouldThrow()
+	public Task CrossJoin_LessThanTwoEntitySets_ShouldThrow()
 	{
 		// Arrange
 		var logger = NullLogger.Instance;
 
 		// Act & Assert
 		var act = () => new ODataCrossJoinBuilder(["Products"], logger);
 		act.Should().ThrowExactly<ArgumentException>();
+		return Task.CompletedTask;
 	}
 
 	[Fact]

PanoramicData.OData.Client.Test/UnitTests/ODataDateTimeConverterTests.cs

@@ -101,7 +101,7 @@ public void Read_InvalidDate_ReturnsDefault()
 	public void Read_SimpleDateFormat_ParsesCorrectly()
 	{
 		// Arrange
-		var json = "\"2024-01-15\"";
+		var json = "\"2024-01-15Z\"";
 
 		// Act
 		var result = JsonSerializer.Deserialize<DateTime>(json, _options);

PanoramicData.OData.Client/HttpMessageContent.cs

@@ -41,14 +41,14 @@ private async Task<byte[]> BuildContentAsync()
 		var sb = new StringBuilder();
 
 		// Request line: METHOD path HTTP/1.1
-		var requestUri = _request.RequestUri?.PathAndQuery ?? "/";
 		sb.Append(_request.Method.ToString());
 		sb.Append(' ');
+		var requestUri = (_request.RequestUri?.IsAbsoluteUri == true ? _request.RequestUri.PathAndQuery : _request.RequestUri?.ToString()) ?? "/";
 		sb.Append(requestUri);
 		sb.AppendLine(" HTTP/1.1");
 
 		// Host header
-		if (_request.RequestUri?.Host is not null)
+		if (_request.RequestUri is { IsAbsoluteUri: true })
 		{
 			sb.Append("Host: ");
 			sb.AppendLine(_request.RequestUri.Host);

PanoramicData.OData.Client/ODataClient.Batch.cs

@@ -109,8 +109,6 @@ private HttpMessageContent BuildOperationContent(ODataBatchOperation operation)
 		}
 
 		var content = new HttpMessageContent(innerRequest);
-		content.Headers.ContentType = new System.Net.Http.Headers.MediaTypeHeaderValue("application/http");
-		content.Headers.TryAddWithoutValidation("Content-Transfer-Encoding", "binary");
 
 		return content;
 	}

PanoramicData.OData.Client/PanoramicData.OData.Client.csproj

@@ -39,4 +39,8 @@
 		<PackageReference Include="Microsoft.SourceLink.GitHub" Version="8.0.0" PrivateAssets="All" />
 	</ItemGroup>
 
+	<ItemGroup>
+  		<InternalsVisibleTo Include="PanoramicData.OData.Client.Test" />
+	</ItemGroup>
+
 </Project>