fix: make bucket subdomain optional in server_name regex pattern

S3-Nginx-Proxy.md

@@ -22,7 +22,7 @@ server {
 	# The regex will support path style as well as virtual-hosted style bucket URLs
 	# path style: http://s3.yourdomain.com/mybucket
 	# virtual-hosted style: http://mybucket.s3.yourdomain.com
-	server_name ~^(?:(?<bucket>[^.]+)\.)s3\.yourdomain\.com;
+	server_name ~^(?:(?<bucket>[^.]+)\.)?s3\.yourdomain\.com;
 
 	ignore_invalid_headers off;
 	client_max_body_size 0;
@@ -31,15 +31,15 @@ server {
 	proxy_set_header Host $host;
 	proxy_set_header X-Real-IP $remote_addr;
 	proxy_set_header X-Forwarded-For $remote_addr;
-        proxy_set_header X-Forwarded-Host $host;
-        proxy_set_header X-Forwarded-Port $server_port;
+	proxy_set_header X-Forwarded-Host $host;
+	proxy_set_header X-Forwarded-Port $server_port;
 
 	proxy_set_header X-Forwarded-Proto $scheme;
 
 	proxy_connect_timeout 300;
 	proxy_http_version 1.1;
 	proxy_set_header Connection "";
-        proxy_request_buffering off;
+	proxy_request_buffering off;
 	chunked_transfer_encoding off;
 
 	# If bucket subdomain is not empty,