Make sure nginx always send HSTS header (#16633)

By default, it'll only send those headers when the response code is one of the following:
- 200, 201, 204, 206, 301, 302, 303, 304, 307 & 308

As all the traffics should be https, the http protocol only exists to do 301 redirect,
and always send the HSTS header is almost one of the best practices, we should set
nginx to do so.

Reference:
- https://nginx.org/en/docs/http/ngx_http_headers_module.html#add_header
- https://ssl-config.mozilla.org/

diff --git a/dist/nginx.conf b/dist/nginx.conf
index 2b260f33c89fc9039d0c066d436d0cf5d5f6e6e5..27ca868ab08f1522c07ad31492e8042082fc28bb 100644 (file)
--- a/dist/nginx.conf
+++ b/dist/nginx.conf
@@ -52,7 +52,7 @@ server {
   gzip_http_version 1.1;
   gzip_types text/plain text/css application/json application/javascript text/xml application/xml application/xml+rss text/javascript;
 
-  add_header Strict-Transport-Security "max-age=31536000";
+  add_header Strict-Transport-Security "max-age=31536000" always;
 
   location / {
     try_files $uri @proxy;
@@ -60,13 +60,13 @@ server {
 
   location ~ ^/(emoji|packs|system/accounts/avatars|system/media_attachments/files) {
     add_header Cache-Control "public, max-age=31536000, immutable";
-    add_header Strict-Transport-Security "max-age=31536000";
+    add_header Strict-Transport-Security "max-age=31536000" always;
     try_files $uri @proxy;
   }
 
   location /sw.js {
     add_header Cache-Control "public, max-age=0";
-    add_header Strict-Transport-Security "max-age=31536000";
+    add_header Strict-Transport-Security "max-age=31536000" always;
     try_files $uri @proxy;
   }
 
@@ -90,7 +90,7 @@ server {
     proxy_cache_valid 410 24h;
     proxy_cache_use_stale error timeout updating http_500 http_502 http_503 http_504;
     add_header X-Cached $upstream_cache_status;
-    add_header Strict-Transport-Security "max-age=31536000";
+    add_header Strict-Transport-Security "max-age=31536000" always;
 
     tcp_nodelay on;
   }