django用postman发送请求，报错：RuntimeError: You called this URL via POST, but the URL doesn‘t end in a slash

django用postman发送请求http://localhost:8000/api/books时，没有在URL后面加 '/'，导致报错：

RuntimeError: You called this URL via POST, but the URL doesn't end in a slash and you have APPEND_SLASH set. Django can't redirect to the slash URL while maintaining POST data. Change your form to point to localhost:8000/api/books/ (note the trailing slash), or set APPEND_SLASH=False in your Django settings.

解决方法：

把url改成   http://localhost:8000/api/books/