diff --git a/backend/entrypoint.sh b/backend/entrypoint.sh
index ce6a6c8..04ac8af 100644
--- a/backend/entrypoint.sh
+++ b/backend/entrypoint.sh
@@ -5,4 +5,9 @@ echo "Applying database migrations..."
 alembic upgrade head
 
 echo "Starting Siftlode API..."
-exec uvicorn app.main:app --host 0.0.0.0 --port 8000 --log-config log_config.json
+# --timeout-keep-alive 75: keep idle upstream connections alive longer than the reverse
+# proxy's idle-reuse window. uvicorn's default (5s) is shorter than Caddy's pooled-keepalive
+# timeout, so Caddy would reuse a connection uvicorn had just closed -> broken pipe / reset
+# on the next request -> 502. Non-idempotent POSTs (the player's progress/state writes,
+# fired every 5s) can't be auto-retried by the proxy, so those 502s reached the user.
+exec uvicorn app.main:app --host 0.0.0.0 --port 8000 --log-config log_config.json --timeout-keep-alive 75