fix: app offline problems (#1266)

build/default.conf

@@ -14,6 +14,11 @@ server {
         try_files $uri /assets/$1 =404;
     }
 
+    # Service Worker requests should not be changed
+    location ~* ^/ngsw {
+        try_files $uri =404;
+    }
+
     location /de {
         index  index.html index.htm;
         try_files $uri $uri/ /de/index.html;
@@ -29,9 +34,9 @@ server {
         try_files $uri $uri/ /en-US/index.html;
     }
 
-    # Set the default language when nothing is entered in the url
+    # Append the default language when no other path matches (e.g. requesting root index.html)
     location / {
-        try_files $uri /${DEFAULT_LANGUAGE}/index.html;
+        rewrite ^/ /${DEFAULT_LANGUAGE}/$uri;
     }
 
     #error_page  404              /404.html;

build/merge-service-workers.js

@@ -41,6 +41,8 @@ locales.forEach((locale) => {
 });
 
 combined.index = "/index.html";
+// add root index.html to correctly cache direct app entry (e.g. without en-US)
+combined["assetGroups"][0]["urls"].push("/index.html");
 
 fs.writeFileSync(`${distFolder}/ngsw.json`, JSON.stringify(combined));
 fs.unlinkSync(`${distFolder}/${firstLocale}/ngsw.json`);
@@ -51,7 +53,9 @@ const swFile = fs
   .toString();
 const patchedSw = swFile.replace(
   "return this.handleFetch(this.adapter.newRequest(this.indexUrl), context);",
-  "return this.handleFetch(this.adapter.newRequest('/' + this.adapter.normalizeUrl(req.url).split('/')[1] + '/index.html'), context);"
+  `const locale = this.adapter.normalizeUrl(req.url).split("/")[1];
+                    const url = locale ? "/" + locale + "/index.html": "/index.html";
+                    return this.handleFetch(this.adapter.newRequest(url), context);`
 );
 fs.writeFileSync(`${distFolder}/ngsw-worker.js`, patchedSw);
 fs.unlinkSync(`${distFolder}/${firstLocale}/ngsw-worker.js`);