Worked on the aws/serverless-java-container repository, focusing on backend and API development using Java. Addressed a critical issue in HTTP response handling by ensuring that headers with null values are excluded from all outgoing responses, thereby preventing malformed data from reaching clients and downstream services. Implemented a regression test to validate this behavior and maintain reliability across future updates. This targeted bug fix improved the stability and correctness of serverless deployments by reducing customer incidents related to invalid headers. Maintained comprehensive test coverage and emphasized reliability for core HTTP integration points, contributing to overall product quality and robust backend service delivery.