3832453 - Additional clarification about I/O idle timeout behavior, streaming responses, and HTTP 504 in SAP API Management

You receive an HTTP 504 Gateway Timeout after approximately 55 seconds when calling a backend through SAP API Management.

You want to understand:

• Whether io.timeout.millis (default 55,000 ms) is a maximum total transaction timeout or an I/O idle timeout;
• How the gateway handles large or streaming responses when the total transfer takes longer than 55 seconds;
• What happens when there are idle gaps longer than 55 seconds between data chunks;
• and what HTTP status code the gateway returns when no data can be read or written within the timeout window.

• SAP API Management

API Management, APIM, io.timeout.millis, 55 seconds, I/O idle timeout, HTTP 504, gateway timeout, streaming, large payload, timeout behavior, idle gap, chunking, pagination, asynchronous, long-running requests , KBA , OPU-API-OD-RT , Runtime , Problem