Common CORS Errors CORS Policy Blocks Redirects When a browser makes a cross-origin request to a URL that responds with a redirect (3xx status)... Credentials Requests Not Allowed This error occurs when a frontend request includes credentials (such as cookies or authentication headers), but the... Invalid Access-Control-Allow-Origin Value The Invalid Access-Control-Allow-Origin Value error occurs when the server responds with an incorrect or malformed... Method Not Allowed by CORS The "Method Not Allowed by CORS" error occurs when a client (browser or API consumer) sends an HTTP request... Misconfigured Access-Control-Allow-Credentials The "Access-Control-Allow-Credentials" header is used in Cross-Origin Resource Sharing (CORS) to allow the... Missing Access-Control-Allow-Headers The `Access-Control-Allow-Headers` header is used in CORS (Cross-Origin Resource Sharing) to specify which... No Access-Control-Allow-Origin Header No Access-Control-Allow-Origin Header error occurs when a web application running in a browser tries to make a request... Origin Mismatch An Origin Mismatch error in CORS happens when the browser detects that the request's `Origin` header... Preflight Request Failed The error CORS preflight request failed occurs when the browser sends a preflight request (an OPTIONS request) to the... Response Type Not Allowed The "Response Type Not Allowed" error in CORS usually occurs when the server does not properly set the... Wildcard Not Allowed for Access-Control-Allow-Headers The `Access-Control-Allow-Headers` response header in CORS (Cross-Origin Resource Sharing) specifies...
