The other simple method for implementing the version reference is to make it part of the request parameters, as we see in the following examples—http://localhost:9090/investors?version=1, http://localhost:9090/investors?version=2.1.0:

@GetMapping("/investors")
public List<Investor> fetchAllInvestorsForGivenVersionAsParameter(
@RequestParam("version") String version)
throws VersionNotSupportedException {
if (!(version.equals("1.1") || version.equals("1.0"))) {
throw new VersionNotSupportedException("version " + version);
}
return investorService.fetchAllInvestors();
}

The output of this is as follows:

The preceding screenshot shows the implementation of versioning through parameters within our sample.