ref: Remove proxy_next_upstream directives (#3973)

Author: aminvakil

nginx.conf

@@ -41,8 +41,6 @@ http {
 	proxy_buffer_size          128k;
 	proxy_buffers              4 256k;
 	proxy_busy_buffers_size    256k;
-	proxy_next_upstream error timeout invalid_header http_502 http_503 non_idempotent;
-	proxy_next_upstream_tries 2;
 
 	# Docker default address pools
 	# https://github.com/moby/libnetwork/blob/3797618f9a38372e8107d8c06f6ae199e1133ae8/ipamutils/utils.go#L10-L22