update

proxy_pass/timeout-300.conf

@@ -1,4 +1,9 @@
+# Keep this as an opt-in long-request profile instead of raising timeouts in
+# forwarded.conf for every proxy location.
 proxy_connect_timeout	300;
 proxy_send_timeout	300;
 proxy_read_timeout	300;
-send_timeout	300;
+
+# send_timeout covers the downstream client socket too, so long-lived responses
+# do not inherit a shorter default than the upstream leg.
+send_timeout	300;