I have a few concerns about adding this to the documentation.

• Directly setting headers in the route configuration is the recommended method.
• The REQUEST_INIT isn't an Angular concept and is already well-documented on MDN.
• There have been no user requests or issues raised about adding more documentation for this.

I understand that configuring headers through the router is the recommended approach. However, there are scenarios—such as managing cookies on the client side—where dynamic header manipulation within the application becomes necessary. For example, synchronizing cookies between the server and client or updating them based on application logic is a common requirement. Therefore, having guidance on how to handle cookies dynamically within Angular could be valuable for developers facing these use cases.

In my case in the referer link in MDN don't found information direct how set header cookie
https://developer.mozilla.org/en-US/docs/Web/API/Response/Response

But i understand that Set Cookie is part of the standard HTTP ( https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Set-Cookie ) , and work well