exceptions.py 文件源码

def exception_handler(exc, context=None):
    """Returns the response that should be used for any given exception.

    By default we handle the REST framework `APIException`, and also
    Django's builtin `Http404` and `PermissionDenied` exceptions.

    Any unhandled exceptions may return `None`, which will cause a 500 error
    to be raised.
    """

    if isinstance(exc, exceptions.APIException):
        headers = {}
        if getattr(exc, 'auth_header', None):
            headers['WWW-Authenticate'] = exc.auth_header
        if getattr(exc, 'wait', None):
            headers['X-Throttle-Wait-Seconds'] = '%d' % exc.wait

        detail = format_exception(exc)
        return Response(detail, status=exc.status_code, headers=headers)

    elif isinstance(exc, Http404):
        return Response({'error_type': exc.__class__.__name__,
                         'errors': [{'message': str(exc)}]},
                        status=status.HTTP_404_NOT_FOUND)

    elif isinstance(exc, DjangoPermissionDenied):
        return Response({'error_type': exc.__class__.__name__,
                         'errors': [{'message': str(exc)}]},
                        status=status.HTTP_403_FORBIDDEN)

    # Note: Unhandled exceptions will raise a 500 error.
    return None