Cross origin request explained
If You are a developer getting started or have played with frontend as well as backend development for some time now then you must have faced issues with CORS a lot of the time. and I guess by now you must have known how to solve them. If you have not then follow along and you will know the reason why it is occuring and how to resolve it. If you already know how to solve it but don't understand the theory and reason behind what you do in order to solve it then you are in the right place. If you are a backend developer then you might have also heard a lot of your frontend guys ask you to enable CORS. For a frontend dev, the typical error you get is this. Access to fetch at 'http://localhost:3000/' from origin 'http://localhost:3001' has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present on the requested resource. If an opaque response serves your needs, set the request's mode to 'no-cors' to fetch the resource with C