Lambda Test Tool returns Error deserializing the input JSON to type APIGatewayProxyRequest with System.Text.Json v7

Hi, I’m working with solution on .net6 with lambda project, and AWS Toolkit for Visual Studio. I faced with issue testing lambda locally using Lambda Test Tool. In case if solution has a reference to System.Text.Json version 7 and above. When I Execute Function from Mock Lambda Test Tool I get following error: “Error deserializing the input JSON to type APIGatewayProxyRequest”, see full error log below, interesting part goes under the Inner 2 Exception: “Operation is not supported on this platform”.

System.Exception: Error deserializing the input JSON to type APIGatewayProxyRequest
   at Amazon.Lambda.TestTool.Runtime.LambdaExecutor.BuildParameters(ExecutionRequest request, ILambdaContext context) in C:\build\Tools\LambdaTestTool\src\Amazon.Lambda.TestTool\Runtime\LambdaExecutor.cs:line 255
   at Amazon.Lambda.TestTool.Runtime.LambdaExecutor.ExecuteAsync(ExecutionRequest request) in C:\build\Tools\LambdaTestTool\src\Amazon.Lambda.TestTool\Runtime\LambdaExecutor.cs:line 65

---------------- Inner 1 Exception ------------

System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation.
   at System.RuntimeMethodHandle.InvokeMethod(Object target, Span`1& arguments, Signature sig, Boolean constructor, Boolean wrapExceptions)
   at System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture)
   at Amazon.Lambda.TestTool.Runtime.LambdaExecutor.BuildParameters(ExecutionRequest request, ILambdaContext context) in C:\build\Tools\LambdaTestTool\src\Amazon.Lambda.TestTool\Runtime\LambdaExecutor.cs:line 225

---------------- Inner 2 Exception ------------

Amazon.Lambda.Serialization.SystemTextJson.JsonSerializerException: Error converting the Lambda event JSON payload to type Amazon.Lambda.APIGatewayEvents.APIGatewayProxyRequest: Operation is not supported on this platform.
   at Amazon.Lambda.Serialization.SystemTextJson.AbstractLambdaJsonSerializer.Deserialize[T](Stream requestStream)

---------------- Inner 3 Exception ------------

System.PlatformNotSupportedException: Operation is not supported on this platform.
   at System.Text.Encodings.Web.OptimizedInboxTextEncoder.AllowedAsciiCodePoints.get_AsVector()
   at System.Text.Encodings.Web.OptimizedInboxTextEncoder.GetIndexOfFirstByteToEncodeSsse3(Byte* pData, UIntPtr lengthInBytes)
   at System.Text.Encodings.Web.OptimizedInboxTextEncoder.GetIndexOfFirstByteToEncode(ReadOnlySpan`1 data)
   at System.Text.Json.Serialization.Metadata.JsonPropertyInfo.CacheNameAsUtf8BytesAndEscapedNameSection()
   at System.Text.Json.Serialization.Metadata.JsonPropertyInfo.Configure()
   at System.Text.Json.Serialization.Metadata.JsonTypeInfo.InitializePropertyCache()
   at System.Text.Json.Serialization.Metadata.JsonTypeInfo.Configure()
   at System.Text.Json.Serialization.Metadata.JsonTypeInfo.<EnsureConfigured>g__ConfigureLocked|143_0()
   at System.Text.Json.JsonSerializerOptions.GetTypeInfoInternal(Type type, Boolean ensureConfigured, Boolean resolveIfMutable)
   at System.Text.Json.JsonSerializer.GetTypeInfo(JsonSerializerOptions options, Type inputType)
   at System.Text.Json.JsonSerializer.Deserialize[TValue](ReadOnlySpan`1 utf8Json, JsonSerializerOptions options)
   at Amazon.Lambda.Serialization.SystemTextJson.DefaultLambdaJsonSerializer.InternalDeserialize[T](Byte[] utf8Json)
   at Amazon.Lambda.Serialization.SystemTextJson.AbstractLambdaJsonSerializer.Deserialize[T](Stream requestStream)

Once I downgraded System.Text.Json package to version 6 in my solution, I’m able to invoke lambda from Lambda Test Tool. Moreover with System.Text.Json package version 7 I was able to invoke my function from AWS Console, meaning it does able to deserialize input to APIGatewayProxyRequest, so the issue seems to be in Mock Lambda Test Tool itself.

Expected Behavior

System.Text.Json version 7+ should not cause deserializing errors using AWS .NET Core 6.0 Mock Lambda Test Tool

Current Behavior

System.Text.Json version 7+ causes deserializing errors using AWS .NET Core 6.0 Mock Lambda Test Tool

Reproduction Steps

You can use any Lambda .net6 project, include System.Text.Json v7+ package in project. Also add AWS Toolkit for Visual Studio (if using that IDE) Test your lambda with Mock Lambda Test Tool Execute Function from Mock Lambda Test Tool, see deserializing error in response.

Possible Solution

No response

Additional Information/Context

No response

AWS .NET SDK and/or Package version used

Packages in solution:

• Amazon.Lambda.Core v2.1.0
• Amazon.Lambda.Serialization.SystemTextJson v2.3.1
• Amazon.Lambda.APIGatewayEvents v2.6.0
• System.Text.Json v7.0.2

Targeted .NET Platform

.NET 6

Operating System and version

Windows 10