def read_file(self, sha, file_path, diff=None):
        raise NotImplementedError
Redirect to a given URL.
dataset/ETHPy150Open dropbox/changes/changes/vcs/base.py/Vcs.read_file--crossover with--dataset/ETHPy150Open AppScale/appscale/AppServer/lib/django-0.96/django/views/generic/simple.py/redirect_to