+ @PostMapping()
+ public ResponseEntity<Void> getVorgang(
+ UriComponentsBuilder builder,
+ @RequestBody String username) {
+ String cleaned = username.trim().toLowerCase();
+ User user = new User(cleaned, LocalDateTime.now(), false);
+ repository.save(user);
+ // TODO: Not-Unique Fehler auslösen
+ UriComponents uri = builder.path("{username}").buildAndExpand(cleaned);
+ return ResponseEntity.created(uri.toUri()).build();