HAProxy is used in an unusual way to control egress traffic for healthcare services in Belgium. It initiates TLS connections to external partners, identifies requests through customized URLs, and applies access controls and service level agreements (SLAs) through backends. This provides visibility, reliability, and flexibility in calls to dozens of partners handling millions of daily messages between systems. Advanced features like path rewriting and SNI alteration allow HAProxy to masquerade requests while maintaining encryption. Configuration management keeps things maintainable as new partners and SLAs are added over time.