GitHub Codespaces proxy limits versus application connection pool sizing

This question examines the boundary at which GitHub Codespaces' port-forwarding proxy mediates application-initiated connection pools within a devcontainer environment. The goal is to determine whether configured pool sizes and timeout parameters remain effective when routed through the GitHub-hosted proxy layer, or whether proxy-imposed thresholds override application settings.

Documented behavior indicates that the automatic idle termination mechanism may disconnect environments after specified inactivity, potentially interrupting long-lived connections without graceful shutdown. Additionally, the proxy's throughput thresholds can drop packets when high-frequency connection requests exceed estimated limits, and devcontainer.json resource adjustments require a full environment rebuild to take effect, complicating iterative tuning.

• What is the effective concurrent connection ceiling when application pool settings conflict with proxy throughput thresholds?
• How does the idle timeout interact with application-defined connection idle periods?
• Can devcontainer.json post-create script sequencing be calibrated to avoid proxy throughput saturation during service startup?