support root and path deployments explicitly

deploy/compose.production.yml

@@ -1,6 +1,6 @@
 services:
   ushort:
-    image: sodium/ushort:0.1.0
+    image: sodium/ushort:0.1.1
     container_name: ushort
     command: ["/app/config.toml"]
     ports:

deploy/nginx-subdomain.conf

@@ -0,0 +1,42 @@
+# URL Shortener — dedicated subdomain location blocks
+# Use inside the server {} block for a host such as s.example.com. Configure
+# base_url = "https://s.example.com" in config.toml.
+
+# Preserve the no-store policy for the HTML entry point.
+location = / {
+    proxy_pass         http://127.0.0.1:18082;
+    proxy_http_version 1.1;
+
+    proxy_set_header   Host              $host;
+    proxy_set_header   X-Real-IP         $remote_addr;
+    proxy_set_header   X-Forwarded-For   $proxy_add_x_forwarded_for;
+    proxy_set_header   X-Forwarded-Proto $scheme;
+
+    proxy_hide_header  Cache-Control;
+    add_header         Cache-Control "no-store";
+}
+
+# Preserve the revalidation policy for CSS, JavaScript, and fonts.
+location ^~ /static/ {
+    proxy_pass         http://127.0.0.1:18082;
+    proxy_http_version 1.1;
+
+    proxy_set_header   Host              $host;
+    proxy_set_header   X-Real-IP         $remote_addr;
+    proxy_set_header   X-Forwarded-For   $proxy_add_x_forwarded_for;
+    proxy_set_header   X-Forwarded-Proto $scheme;
+
+    proxy_hide_header  Cache-Control;
+    add_header         Cache-Control "no-cache";
+}
+
+# API calls and short-code redirects.
+location / {
+    proxy_pass         http://127.0.0.1:18082;
+    proxy_http_version 1.1;
+
+    proxy_set_header   Host              $host;
+    proxy_set_header   X-Real-IP         $remote_addr;
+    proxy_set_header   X-Forwarded-For   $proxy_add_x_forwarded_for;
+    proxy_set_header   X-Forwarded-Proto $scheme;
+}