Charles Ma enhanced HTTP request forwarding resilience in the ethereum-optimism/infra repository by introducing explicit context-cancellation handling and consistent error semantics within the proxy layer. Using Go, he delivered a 499 error code to accurately represent client-side context cancellations, ensuring these errors were immediately returned to clients rather than misclassified as backend issues. He also refactored the handling of “Too Many Requests” errors to use a new ErrTooManyRequests definition, improving consistency across the API gateway. This work improved observability, reduced false alarms, and enabled faster troubleshooting, demonstrating depth in backend development, error handling, and network programming within production infrastructure.