Versioning in RESTful web services in Spring Boot

There are several ways to handle versioning in RESTful web services in Spring Boot:

1. Using the URL: You can include the version number in the URL of the RESTful web service. For example, /api/v1/users and /api/v2/users. This approach is simple to implement and easy to understand, but it can quickly lead to a large number of URLs as the number of versions increases.
2. Using the Accept header: You can use the Accept header to specify the version of the RESTful web service that the client is requesting. For example, Accept: application/vnd.api+json;version=1 and Accept: application/vnd.api+json;version=2. This approach is more flexible than the URL approach, but it can be more complex to implement.
3. Using custom request header: You can define a custom header to specify the version of the RESTful web service that the client is requesting. For example, Api-version: 1 and Api-version: 2. This approach is more flexible than the URL approach, but it can be more complex to implement.
4. Using a version parameter: You can include a version parameter in the request. For example, /api/users?version=1 and /api/users?version=2. This approach is more flexible than the URL approach, but it can be more complex to implement.

In Spring Boot, you can handle versioning by creating different versions of the same REST controller and using a RequestMapping to handle the different versions. For example,

@RestController
@RequestMapping("/api/v1")
public class UsersV1Controller {
   // Your code here
}

@RestController
@RequestMapping("/api/v2")
public class UsersV2Controller {
   // Your code here
}

This way, you can separate the code for each version of the API, making it easier to maintain and evolve.

In summary, there are several ways to handle versioning in RESTful web services in Spring Boot, such as using the URL, the Accept header, custom request header or a version parameter. You can also create different versions of the same REST controller and use a RequestMapping to handle the different versions.