Integrated automatic locale redirect

Dockerfile

@@ -2,13 +2,15 @@ FROM alpine:edge
 EXPOSE 80
 
 RUN apk update && \
-  apk add \
-    caddy \
-    mailcap && \
-  rm -rf \
-    /var/cache/apk/*
+  apk add wget mailcap ca-certificates && \
+  rm -rf /var/cache/apk/* && \
+  wget -O /tmp/caddy.tar.gz "https://caddyserver.com/download/build?os=linux&arch=amd64&features=locale%2Csearch" && \
+  mkdir -p /tmp/caddy && \
+  tar xvzf /tmp/caddy.tar.gz -C /tmp/caddy && \
+  cp /tmp/caddy/caddy /usr/sbin/caddy && \
+  rm -rf /tmp/caddy*
 
-CMD ["/usr/sbin/caddy", "-conf", "/etc/caddy/caddy.conf"]
+CMD ["/usr/sbin/caddy", "-conf", "/etc/caddy.conf"]
 
-COPY docker/caddy.conf /etc/caddy/caddy.conf
+COPY docker/caddy.conf /etc/caddy.conf
 COPY public /srv/www

docker/caddy.conf

@@ -1,7 +1,39 @@
 :80 {
   root /srv/www
 
-  errors {
-    404 /404.html
+  locale en-US zh-CN zh-TW pt-BR nl-NL {
+    detect header
   }
+
+  redir 301 {
+    if {path} match ^/$
+    / /{>Detected-Locale}/
+  }
+
+  rewrite /en-US/ {
+    regexp (.*)
+    to /en-us/{1}
+  }
+
+  rewrite /zh-CN/ {
+    regexp (.*)
+    to /zh-cn/{1}
+  }
+
+  rewrite /zh-TW/ {
+    regexp (.*)
+    to /zh-tw/{1}
+  }
+
+  rewrite /pt-BR/ {
+    regexp (.*)
+    to /pt-br/{1}
+  }
+
+  rewrite /nl-NL/ {
+    regexp (.*)
+    to /nl-nl/{1}
+  }
+
+  header / Vary "Accept-Language"
 }