Fix TeslaMate subpath websocket proxy

Author: zijian-z

frontend/nginx/default.conf

@@ -1,3 +1,12 @@
+geo $dollar_sign {
+    default "$";
+}
+
+map $http_upgrade $connection_upgrade {
+    default upgrade;
+    "" close;
+}
+
 server {
     listen 80;
     server_name _;
@@ -49,21 +58,41 @@ server {
         rewrite ^/teslamate/(.*)$ /$1 break;
         proxy_pass http://$teslamate_upstream;
         proxy_http_version 1.1;
+        proxy_set_header Accept-Encoding "";
         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_set_header X-Forwarded-Prefix /teslamate;
         proxy_set_header Upgrade $http_upgrade;
-        proxy_set_header Connection "upgrade";
+        proxy_set_header Connection $connection_upgrade;
         proxy_read_timeout 3600s;
         proxy_redirect / /teslamate/;
         sub_filter_once off;
-        sub_filter_types text/css application/javascript;
+        sub_filter_types *;
         sub_filter 'href="/' 'href="/teslamate/';
         sub_filter 'src="/' 'src="/teslamate/';
         sub_filter 'action="/' 'action="/teslamate/';
-        sub_filter '"/live/websocket' '"/teslamate/live/websocket';
+        sub_filter '"/live' '"/teslamate/live';
+        sub_filter '"/js/' '"/teslamate/js/';
+        sub_filter 'url(/' 'url(/teslamate/';
+        sub_filter 'baseUrl:window.location.origin' 'baseUrl:window.location.origin+"/teslamate"';
+        sub_filter 'url:this.redirect?void 0:this.href||void 0' 'url:this.redirect?void 0:(this.href!==null?this.href.replace("/teslamate","/"):this.href)||void 0';
+        sub_filter 'onRedirect({to:o,flash:r}){this.liveSocket.redirect(o,r)}' 'onRedirect({to:o,flash:r}){this.liveSocket.redirect(o.replace(o.startsWith("/")?/^\//gm:/\/${dollar_sign}/gm, "/teslamate/"),r)}';
+    }
+
+    location /live/websocket {
+        set $teslamate_upstream teslamate:4000;
+        proxy_pass http://$teslamate_upstream;
+        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_set_header X-Forwarded-Prefix /teslamate;
+        proxy_set_header Upgrade $http_upgrade;
+        proxy_set_header Connection $connection_upgrade;
+        proxy_read_timeout 3600s;
     }
 
     location /assets/ {