Ursprungsdomänen

Ursprungsdomänen, in the context of computing and networking, refers to the security domain from which a request originates. When a web browser or application makes a request to access a resource, the browser enforces the same-origin policy. This policy restricts how a document or script loaded from one origin can interact with a resource from another origin. The origin is typically defined by the combination of scheme (e.g., http, https), host (e.g., example.com), and port (e.g., 80, 443).

If a request is made from a web page hosted on example.com to a resource on the same example.com, the ursprungsdomäne is considered the same, and the request is generally allowed. However, if the request is made from example.com to a resource on anotherdomain.com, or even a different port on example.com, the ursprungsdomäne is different. In such cases, the browser will block the request unless explicitly permitted by mechanisms like Cross-Origin Resource Sharing (CORS).

The ursprungsdomäne is a fundamental security concept that prevents malicious websites from accessing sensitive data or performing unauthorized actions on behalf of a user. For example, it prevents a script on evil.com from reading cookies or making requests to your bank's website (yourbank.com) when you are logged in. Understanding the ursprungsdomäne is crucial for web developers to implement secure applications and for users to understand the security implications of web browsing. The strict enforcement of this policy helps maintain the integrity and security of user data across different web services.