The CORS (Cross Origin Resource Sharing) ASP.NET Web API allows us to request data from another website without having to use JavaScript. This will let us access data from sites that don’t support cross origin requests. This prevents a web page and increases the security prevents a web page from making ajax requests to another domain when the access control allow methods are not defined.
Tag: cors
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Solving No Access-Control-Allow-Origin with Node js and Express
If you are receiving an error similar to XMLHttpRequest cannot load localhost:3000. No Access-Control-Allow-Origin header is present on the requested resource. Origin localhost:8888 is therefore not allowed access. This typically implies that you need to enable CORS on your Node js server that is running Express as the web server. Example code below.
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No Access-Control-Allow-Origin header is present on the requested resource
Are you confused why you are getting this error? This error is caused when you are trying to perform an AJAX call from one site to a different site. Because Javascript is a client-side application it requires additional security to help protect the users from malicious code, e.g. calling a different site without the user knowing.