NPE when returning status code 207 MULTI_STATUS with AWS ALB

[jmktam]

Expected Behavior

HTTP/1.1 207 Multi Status

Actual Behaviour

HTTP/1.1 500 Internal Server Error

[AbstractLambdaContainerHandler:215:] [] ERROR Error while handling request java.lang.NullPointerException: null
	at io.micronaut.function.aws.proxy.MicronautResponseWriter.writeResponse(MicronautResponseWriter.java:113)
	at io.micronaut.function.aws.proxy.MicronautResponseWriter.writeResponse(MicronautResponseWriter.java:50)
	at io.micronaut.function.aws.proxy.AbstractLambdaContainerHandler.proxy(AbstractLambdaContainerHandler.java:213)
	at io.micronaut.function.aws.proxy.MicronautLambdaHandler.handleRequest(MicronautLambdaHandler.java:68)
	at io.micronaut.function.aws.proxy.MicronautLambdaHandler.handleRequest(MicronautLambdaHandler.java:35)
	at lambdainternal.EventHandlerLoader$PojoHandlerAsStreamHandler.handleRequest(EventHandlerLoader.java:180)
	at lambdainternal.EventHandlerLoader$2.call(EventHandlerLoader.java:902)
	at lambdainternal.AWSLambda.startRuntime(AWSLambda.java:340)
	at lambdainternal.AWSLambda.<clinit>(AWSLambda.java:63)
	at java.lang.Class.forName0(Native Method)
	at java.lang.Class.forName(Class.java:348)
	at lambdainternal.LambdaRTEntry.main(LambdaRTEntry.java:150)

Steps To Reproduce

1. Create a mn app: micronaut/2.4.2/bin/mn create-app --features=aws-lambda,aws-lambda-custom-runtime,shadeddd example.micronaut.micronautguided --build=maven --lang=java
2. Return a status of 209 MULTI_STATUS

     @Get("/207")
     // Setting a status that isn't in javax.ws.rs.core.Response.Status
     // causes a null pointer exception and causes the api to return a
     // 500 Internal Server Error
     @Status(HttpStatus.MULTI_STATUS)
     public String multiStatus(){
         return "multiStatus";
     }

3. Deploy app as AWS Lambda (java8 runtime)
4. Create AWS ALB and TargetGroup
5. Make Http request

Environment Information

Env: AWS ALB with AWS Lambda Java8 runtime
Micronaut Version: 2.4.2
JDK Version: 1.8

A potential solution(?): #1168

Example Application

No response

Version

2.4.2