What is Anycast DNS?
An introduction to Anycast DNS
Cross-Origin Resource Sharing (CORS) is a security feature implemented by web browsers that controls how web pages in one origin can request and interact with resources hosted on another origin.
By default, a web page's scripts cannot make requests to a different domain than the one the web page came from. This restriction is known as the "same-origin policy" and is in place to prevent potentially malicious actions, such as cross-site request forgery attacks. However, in today's interconnected web landscape, there are legitimate scenarios where a web page might need to access resources (like APIs) from another domain. CORS provides a secure way to allow exceptions to the same-origin policy.
When a web page makes a cross-origin request, the browser sends the request with an Origin header indicating where the request comes from. The server can then decide whether to permit the request based on its CORS configuration. If allowed, the server sends back an Access-Control-Allow-Origin header in its response, matching the origin of the requester or a wildcard (*), indicating that the requester is permitted to access the resource.
A common challenge developers face is the "CORS error." This error occurs when either:
Adjusting CORS policies should be done with care, as overly permissive settings can expose web resources to security risks.
An introduction to Anycast DNS
An overview of the different types of browser hints and how they help with website performance
An overview of the cache control header sent by websites.
An introduction to CDNs (Content Delivery Network)
An overview of dynamic content caching.
Explanation for what early hints are in relation to web requests.
© PEAKHOUR.IO PTY LTD 2025 ABN 76 619 930 826 All rights reserved.