![403 response to a CORS preflight request from an angular app to a spring security REST API caused by a Access-Control-Request-Headers mismatch | Coding Notes 403 response to a CORS preflight request from an angular app to a spring security REST API caused by a Access-Control-Request-Headers mismatch | Coding Notes](https://nicolas.riousset.com/wp-content/uploads/2021/03/2021-03-18_23h24_19.png)
403 response to a CORS preflight request from an angular app to a spring security REST API caused by a Access-Control-Request-Headers mismatch | Coding Notes
![angular6 - Spring Boot - Cross-Origin Request Blocked (Reason: CORS header 'Access-Control-Allow-Origin' missing) - Stack Overflow angular6 - Spring Boot - Cross-Origin Request Blocked (Reason: CORS header 'Access-Control-Allow-Origin' missing) - Stack Overflow](https://i.stack.imgur.com/15EXH.png)
angular6 - Spring Boot - Cross-Origin Request Blocked (Reason: CORS header 'Access-Control-Allow-Origin' missing) - Stack Overflow
![Spring boot - Cross Origin AJAX HTTP Requests | What is CORS? | Cross Origin Resource Sharing - YouTube Spring boot - Cross Origin AJAX HTTP Requests | What is CORS? | Cross Origin Resource Sharing - YouTube](https://i.ytimg.com/vi/BmDSsmUpMjI/maxresdefault.jpg)