Django-piston尊重HTTP状态码并默认处理常见错误（auth等），但您也可以使用来自piston. utils的rc抛出新的异常或状态。
例如：

from django.contrib.auth.models import User
from piston.handler import AnonymousBaseHandler
from piston.utils import rc

class AnonymousUserHandler(AnonymousBaseHandler):
    allowed_methods = ('GET', )
    fields = ('id', 'username',)

    def read(self, request):
        try:
            user = User.objects.get(username=request.GET.get('username', None))
            return user
        except Exception:
            resp = rc.NOT_FOUND
            resp.write(' User not found')
            return resp

查看https://django-piston-sheepdog.readthedocs.io/en/latest/helpers.html上的所有实用程序