Sorry, I’m no longer associated with my previous company where I encountered this issue, and wasn’t able to check on this for the longest time due to difference of domain/tech stack in my current work.
IIRIC we did adjust the keepAliveTimeout, headersTimeout , and keepAlive settings of strapi but it did not totally fixed the issue. We tried different combination of timeout configurations but we still couldn’t fix and/or understand the issue. It did lessen(not significantly) the occurrence of the error but the issue still occur.