Error in brief

My Angular web application runs on port 4200, and my spring boot application runs on server on port 8080. I could not enable CORS in my backend, so, I got an error when sending a request from my application like this.

Reason
My pre-flight request is not responded with status OK(200).

Solution

I enabled CORS in my backend. To do this, there are several methods. Here in my post, I have shown the easiest way to do that. But, if you are interest in knowing other ways, click me )

By using Web Security in Spring Boot,

You have to create a web security configuration class. I hope everybody creates that class for backend authentication purposes.

If you have already created that class, inside configure( HttpSecurity httpSecurity ) method ,add this line httpSecurity.cors();

It’s that simple !!!
Originally published at https://webtechmora.blogspot.com.