We will now add the method to create a new Todo. The HTTP method to be used for creation is Post. We will post to a "/users/{name}/todos" URI:

    @PostMapping("/users/{name}/todos")
    ResponseEntity<?> add(@PathVariable String name,
    @RequestBody Todo todo) { 
      Todo createdTodo = todoService.addTodo(name, todo.getDesc(),
      todo.getTargetDate(), todo.isDone());
      if (createdTodo == null) {
         return ResponseEntity.noContent().build();
      }

     URI location = ServletUriComponentsBuilder.fromCurrentRequest()

    .path("/{id}").buildAndExpand(createdTodo.getId()).toUri();
    return ResponseEntity.created(location).build();
   }

A few things to note are as follows:

• @PostMapping("/users/{name}/todos"): @PostMapping annotations map the add() method to the HTTP Request with a POST method.
• ResponseEntity<?> add(@PathVariable String name, @RequestBody Todo todo): An HTTP post request should ideally return the URI to the created resources. We use ResourceEntity to do this. @RequestBody binds the body of the request directly to the bean.
• ResponseEntity.noContent().build(): Used to return that the creation of the resource failed.
• ServletUriComponentsBuilder.fromCurrentRequest().path("/{id}").buildAndExpand(createdTodo.getId()).toUri(): Forms the URI for the created resource that can be returned in the response.
• ResponseEntity.created(location).build(): Returns a status of 201(CREATED) with a link to the resource created.