![]() ![]() The website attempts to make a connection to your bank in the background maliciously. To understand who needs to set this header, consider this scenario: You are browsing a website that is used to view and listen to songs. Who needs to set Access-Control-Allow-Origin? This tells the browser what origins are allowed to receive requests from this server. There are a few headers that allow sharing of resources across origins, but the main one is Access-Control-Allow-Origin. With the help of CORS, browsers allow origins to share resources amongst each other. Here is an example from Mozilla Developer Network that explains this really well: In order to allow origin A to access your resources, your origin B will need to let the browser know that it is okay for me to get resources from your origin.To protect your security, the browser will not let me access resources from and will block my request.I have an origin A: and I want to get resources from origin B.Here's an example of where this comes into action. ![]() Origin is not just the hostname, but a combination of port, hostname and scheme, such as. CORS, or Cross Origin Resource Sharing, is a mechanism for browsers to let a site running at origin A to request resources from origin B. What is the Access-Control-Allow-Origin header?Īccess-Control-Allow-Origin is a CORS header. In this post, we are going to learn why this error happens and how you can fix it. Often times when calling an API, you may see an error in your console that looks like this:Īccess to fetch at '' from origin '' has been blocked by CORS policy: The 'Access-Control-Allow-Origin' header has a value that is not equal to the supplied origin ![]()
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