We will now add the method for updating the details of an existing Todo. The HTTP method to be used for updating a resource is PUT. We will post to a "/users/{name}/todos/{id}" URI:

@PutMapping("/users/{name}/todos/{id}")
public ResponseEntity<Todo> updateTodo(@PathVariable String name, @PathVariable int id,
      @RequestBody Todo todo) {

   todoService.update(todo);

   return new ResponseEntity<Todo>(todo, HttpStatus.OK);

}

A few things to note are as follows:

• @PutMapping("/users/{name}/todos/{id}"): @PutMapping annotations map the update() method to the HTTP request with a PUT method.
• public ResponseEntity<Todo> updateTodo(@PathVariable String name, @PathVariable int id, @RequestBody Todo todo): An HTTP PUT request should ideally return the content of the updated resource. We use ResourceEntity to do this. @RequestBody binds the body of the request directly to the bean.