@SdkInternalApi
    Map<HandlerContextKey<?>, Object> getHandlerContext() {
        return Collections.unmodifiableMap(this.handlerContext);
    }
Retrieve an unmodifiable collection of all handler context objects. This allows a {@link Request} derived from a
{@link AmazonWebServiceRequest} to inherit its context. This does not protect the objects within the map from being
modified.

<p>This should not be used by customers.</p>
aws-java-sdk-core/src/main/java/com/amazonaws/AmazonWebServiceRequest.java