If you are seeing "ECID not found" error it means that a required ECID (primary identity) is missing from your payload, which is essential for processing the request.
Regarding automatic retries for HTTP API streaming ingestion:
-Many HTTP APIs do retry automatically for transient errors (like network issues or server-side problems), typically using exponential backoff.
-The number of retries is usually 3-5, but this depends on the service you're using.
-If retries fail, the request may either be discarded or return an error response.