Revert "fix(service-worker): update service worker to handle seeking better for videos (#60029)" (#62422)

This reverts commit c663277df6.

PR Close #62422

packages/examples/service-worker/push/ngsw-worker.js

@@ -3,7 +3,7 @@
  * Copyright Google LLC All Rights Reserved.
  *
  * Use of this source code is governed by an MIT-style license that can be
- * found in the LICENSE file at https://angular.dev/license.
+ * found in the LICENSE file at https://angular.dev/license
  */
 
 // Mock `ngsw-worker.js` used for testing the examples.

packages/service-worker/worker/src/driver.ts

@@ -209,12 +209,6 @@ export class Driver implements Debuggable, UpdateSource {
       return;
     }
 
-    // Calls range request handler
-    if (req.headers.has('range')) {
-      event.respondWith(this.handleRangeRequest(req));
-      return;
-    }
-
     // The only thing that is served unconditionally is the debug page.
     if (requestUrlObj.path === this.ngswStatePath) {
       // Allow the debugger to handle the request, but don't affect SW state in any other way.
@@ -268,63 +262,6 @@ export class Driver implements Debuggable, UpdateSource {
     event.respondWith(this.handleFetch(event));
   }
 
-  // function to handle Range requests
-  private async handleRangeRequest(req: Request): Promise<Response> {
-    try {
-      const response = await fetch(req);
-      const contentType = response.headers.get('Content-Type');
-
-      // Only apply logic to content that is a video
-      if (!contentType || !contentType.startsWith('video/')) {
-        return response;
-      }
-
-      const rangeHeader = req.headers.get('range');
-      if (!rangeHeader) {
-        return new Response(null, {
-          status: 416,
-          statusText: 'Range Not Satisfiable',
-        });
-      }
-
-      const rangeMatch = /bytes=(\d+)-(\d+)?/.exec(rangeHeader);
-      if (!rangeMatch) {
-        return new Response(null, {
-          status: 416,
-          statusText: 'Range Not Satisfiable',
-        });
-      }
-
-      const start = Number(rangeMatch[1]);
-      const end = rangeMatch[2] ? Number(rangeMatch[2]) : undefined;
-
-      const buffer = await response.arrayBuffer();
-      const contentLength = buffer.byteLength;
-
-      const chunk = buffer.slice(start, end ? end + 1 : contentLength);
-      const chunkLength = chunk.byteLength;
-
-      const headers = new Headers(response.headers);
-      headers.set(
-        'Content-Range',
-        `bytes ${start}-${end ? end : contentLength - 1}/${contentLength}`,
-      );
-      headers.set('Content-Length', chunkLength.toString());
-      headers.set('Accept-Ranges', 'bytes');
-
-      return new Response(chunk, {
-        status: 206,
-        statusText: 'Partial Content',
-        headers: headers,
-      });
-    } catch (error) {
-      return new Response(null, {
-        status: 500,
-        statusText: 'Internal Server Error',
-      });
-    }
-  }
-
   /**
    * The handler for message events.
    */