The browser can also fetch resources from a server in a different domain like We will call this server “ Cross-Origin server”.The origin server also hosts other resources like the movies.json API in this example.The origin server returns the page named index.html as a response to the browser.The browser sends the request to a server in a domain named We will call this server “ Origin server” which hosts the page named index.html.The following steps happen, when a user types in a URL: in the browser: This diagram shows the main participants of a CORS flow: But we will be using these terms for referring to the server that is hosting the source application and the server to which the browser will send the CORS request. The terms origin server and cross-origin server are not CORS terms. We consider two URLs to be of the same origin only if all three elements match.Ī more elaborate explanation of the Web Origin Concept is available in RFC 6454. Port number like 8000 or 80 (default HTTP port).What is an Origin?Īn Origin in the context of CORS consists of three elements: We will then use these terms consistently throughout this article. CORS Terminologyīefore going further, let us define some frequently used terms like browsers, servers, origins, cross-origins. The CORS protocol is implemented by all modern browsers to allow controlled access to resources located outside of the browser’s origin. The SOP was defined in the early years of the web and turned out to be too restrictive for the new age applications where we often need to fetch different kinds of resources from multiple origins. The Same-Origin Policy permits the browser to load resources only from a server hosted in the same-origin as the browser. The CORS protocol was defined to relax the default security policy called the Same-Origin Policy (SOP) used by the browsers to protect their resources. The role of a CORS policy is to maintain the integrity of a website and secure it from unauthorized access. Let us understand in greater detail the role of a CORS policy for fetching resources from remote origins, followed by how CORS policy is enforced by browsers, and how we implement CORS in our applications in the subsequent sections. Using web fonts like Typekit and Google Fonts in an HTML hosted in a domain xyz.com from their remote domains.Show tweets from a public Twitter handle in an HTML hosted in a domain xyz.com by calling a Twitter API. ![]()
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