http-client-java, option for allowing null value passed in property

[Weidong Xu (weidongxu-microsoft)]

fixAzure/autorest.java#3102

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[Copilot]

Pull Request Overview

This PR adds support for allowing null values to be passed to specific model properties and serialized as explicit null fields in JSON output. The feature addresses issue #3102 by implementing a property-include-always option that forces serialization of null values for specified properties instead of omitting them entirely.

Key changes:

• Added a new configuration option property-include-always to control which properties should always be serialized even when null
• Modified the JSON serialization logic to explicitly write null fields for specified properties
• Added test coverage to verify the behavior works correctly

Reviewed Changes

Copilot reviewed 8 out of 8 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
EmitterOptions.java	Added propertyIncludeAlways field and JSON parsing support for the new option
TypeSpecFluentPlugin.java	Added configuration mapping to pass the new option to the generator settings
FluentJavaSettings.java	Added documentation for the property names that should always be serialized
FluentStreamStyleSerializationModelTemplate.java	Implemented custom serialization logic to handle null value serialization for specified properties
StreamSerializationModelTemplate.java	Refactored serialization methods to be extensible and support custom behavior
FunctionConfiguration.java	Generated test model with explicit null field serialization for the input property
StreamStyleSerializationTests.java	Added test to verify null values are properly serialized for specified properties
Generate.ps1	Added test configuration to enable the new feature for FunctionConfiguration.input