Spring controller layer solves cross-domain issues

A short time ago, a small feature was developed. As a backend development, after I have written the interface, I have no problem simulating the front-end interface test in JUnit. However, when the front-end personnel Call my interface, how to tune there is no return value.

Later, this is because the E front end uses Ajax to call back-end interfaces that are not allowed across domains. The workaround is also simple, as long as the Controller layer interface function is annotated @CrossOrigin (origins = "XXXXX").

Spring controller layer solves cross-domain issues