fix(serviceworker): Fixed CORS and Cache Control handling for Service Worker

ts_web_serviceworker/classes.cachemanager.ts

@@ -23,9 +23,13 @@ export class CacheManager {
         // internal request
         matchRequest = requestArg;
       } else {
+        // For external requests, create a new request with appropriate CORS settings
         matchRequest = new Request(requestArg.url, {
-          ...requestArg.clone(),
-          mode: 'cors'
+          method: requestArg.method,
+          headers: requestArg.headers,
+          mode: 'cors',
+          credentials: 'same-origin',
+          redirect: 'follow'
         });
       }
       return matchRequest;
@@ -137,17 +141,29 @@ export class CacheManager {
           const responseToPutToCache = newResponse.clone();
           const headers = new Headers();
           responseToPutToCache.headers.forEach((value, key) => {
-            if (
-              value !== 'Cache-Control'
-              && value !== 'cache-control'
-              && value !== 'Expires'
-              && value !== 'expires'
-              && value !== 'Pragma'
-              && value !== 'pragma'
-            ) {
+            // Preserve all headers except caching headers
+            if (![
+              'Cache-Control',
+              'cache-control',
+              'Expires',
+              'expires',
+              'Pragma',
+              'pragma'
+            ].includes(key)) {
               headers.set(key, value);
             }
           });
+          
+          // Ensure CORS headers are present in cached response
+          if (!headers.has('Access-Control-Allow-Origin')) {
+            headers.set('Access-Control-Allow-Origin', '*');
+          }
+          if (!headers.has('Access-Control-Allow-Methods')) {
+            headers.set('Access-Control-Allow-Methods', 'GET, POST, PUT, DELETE, OPTIONS');
+          }
+          if (!headers.has('Access-Control-Allow-Headers')) {
+            headers.set('Access-Control-Allow-Headers', 'Content-Type');
+          }
           // Prevent browser caching while allowing service worker caching
           headers.set('Cache-Control', 'no-store, no-cache, must-revalidate, proxy-revalidate');
           headers.set('Pragma', 'no-cache');