Http code for already exists

- Http code for username already exists
- Http code post already exists
- Http code file already exists
- Http code item already exists
- Http code create already exists
- Http status code for email already exists
- Http status code for resource already exists
- Http status code for data already exists
- Http status code for record already exists
- Http status code for account already exists
- Http status code for username already exists
- Http error code for resource already exists
- Rest http code already exists