ensure non JS .gz files get needed "Content Encoding" header. make ng…

…inx config more easily hot reloadable

Dockerfile

@@ -2,8 +2,7 @@ FROM nginx:alpine
 
 WORKDIR /usr/share/nginx/html
 
-RUN rm -f index.html
-
-COPY default.conf /etc/nginx/conf.d/
+RUN rm -f index.html && \
+    ln -sf /usr/share/nginx/html/default.conf /etc/nginx/conf.d/default.conf
 
 COPY . .

default.conf

@@ -17,8 +17,9 @@ server {
     # see https://nginx.org/en/docs/http/ngx_http_charset_module.html for more details
     charset utf-8;
 
+    root   /usr/share/nginx/html;
+
     location / {
-        root   /usr/share/nginx/html;
         index  index.html index.htm;
 
         # customizations:
@@ -29,17 +30,20 @@ server {
         add_header  Vary  Origin;
     }
 
-    # customization - like 1st location, but with `Content-Type` & `Content-Encoding` headers
-    location ~\.(js|wasm)\.gz$ {
-        root   /usr/share/nginx/html;
+    # customization - like 1st location, but with `Content-Encoding` header
+    location ~ \.gz$ {
         add_header  Access-Control-Allow-Origin  *;
         add_header  Access-Control-Allow-Methods  GET,POST,OPTIONS;
         add_header  Access-Control-Allow-Headers  Accept-Encoding,Accept-Language,Authorization,Cache-Control,Content-Length,Content-Range,DNT,Pragma,Range,X-Requested-With;
         add_header  Vary  Origin;
 
-        types { }
-        default_type  application/javascript;
         add_header  Content-Encoding gzip;
+
+        location ~ \.(js|wasm)\.gz$ {
+            # these files additionally need specific content type
+            types { }
+            default_type  application/javascript;
+        }
     }
 
     error_page   500 502 503 504  /50x.html;