Behind Nginx (3 Instances)

> 💡 **Note:** R has a limit on the number of simultaneous connections: > > - **Up to R version 4.4.0**: The maximum is **128 connections**. > - **R version 4.4.1 and above**: Increased to **4096 connections**. > > When using `future_promise()` or running multiple APIs concurrently (e.g., 3 instances behind Nginx in the same environment), you may quickly hit these limits — especially under heavy load. Consider adjusting or distributing instances if needed.