Add hocuspocus.

proxy/Caddyfile.template

@@ -1,12 +1,18 @@
 :80 {
-    reverse_proxy * http://${APP_HOST}:8080 {
-        # The following directives are needed to make the proxy forward explicitly the X-Forwarded-* headers. If unset,
-        # Caddy will reset them. See: https://caddyserver.com/docs/caddyfile/directives/reverse_proxy#defaults
-        # This is needed, if you are using a reverse proxy in front of the compose stack and Caddy is NOT your first
-        # point of contact.
-        # When using Caddy is reachable as a first point of contact, it is highly recommended to configure the server's
-        # global `trusted_proxies` directive. See: https://caddyserver.com/docs/caddyfile/options#trusted-proxies
+    # Reverse proxy for WebSocket connections
+    @hocuspocus {
+        path /hocuspocus*
+    }
+    reverse_proxy @hocuspocus ${HOCUSPOCUS_HOST}:1234 {
+        header_up X-Forwarded-Proto {header.X-Forwarded-Proto}
+        header_up X-Forwarded-For {header.X-Forwarded-For}
+    }
 
+    # Reverse proxy for all other HTTP requests
+    @app {
+        not path /hocuspocus*
+    }
+    reverse_proxy @app ${APP_HOST}:8080 {
         header_up X-Forwarded-Proto {header.X-Forwarded-Proto}
         header_up X-Forwarded-For {header.X-Forwarded-For}
     }

proxy/Dockerfile

@@ -3,6 +3,9 @@ FROM caddy:2
 COPY ./Caddyfile.template /etc/caddy/Caddyfile.template
 
 ARG APP_HOST
-RUN sed 's|${APP_HOST}|'"$APP_HOST"'|g' /etc/caddy/Caddyfile.template > /etc/caddy/Caddyfile
+ARG HOCUSPOCUS_HOST
+RUN sed -e 's|${APP_HOST}|'"$APP_HOST"'|g' \
+        -e 's|${HOCUSPOCUS_HOST}|'"$HOCUSPOCUS_HOST"'|g' \
+    /etc/caddy/Caddyfile.template > /etc/caddy/Caddyfile
 
 ENTRYPOINT ["caddy", "run", "--config", "/etc/caddy/Caddyfile"]