The same-origin policy is a security measure to prevent Cross-Site Request Forgery (CSRF). This means that a website is only allowed to make requests to the same origin unless the response from other origins includes the right CORS headers (the CORS headers will be listed in the next section of this article). Internet browsers follow the same-origin policy and restrict cross-origin HTTP requests initiated from scripts. Two URLs would be considered to be having different origins when they have different protocols, ports (if specified), or hosts.įor example, making a request from to is considered cross-origin as they have different hostnames. It is a mechanism for relaxing the same-origin policy of modern internet browsers. The name explains itself, Cross-Origin Resource Sharing (CORS)is an HTTP mechanism that allows resource sharing from one origin to another origin securely. Method not supported under Access-Control-Allow-Methods headerīefore finding solutions to fix the error, we need to understand what is CORS.No ‘Access-Control-Allow-Headers’ headers present. No ‘Access-Control-Allow-Origin’ header present.Usually, you will see an error message Access to XMLHttpRequest has been blocked by CORS policy on the browser console followed by a cause like one of these below: If you haven’t, you might encounter the error at some point in your development journey. There are around 15,400 questions about a CORS error asked on Stackoverflow □: If you are a web developer, I believe you have encountered a CORS error before during development when working with an API.
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