django - Python Social Auth - Redirect to a URL after raising an AuthException -

when user try login in website using google account check if gmail registered in db.

this pipeline.py

def check_email(request, backend, details, uid, user=none, *args, **kwargs):     if backend.name == 'google-oauth2':          # verifica se é um usuário jah existente pelo google, e que apenas vai fazer o login         if uid , user:             pass          # se ele não existe é pq será registrado         else:             # pega o e-mail cara que vai ser registado             email = details.get('email', '')             # procura na db se existe algum email parecido, se existir volta pro login             count = user.objects.filter(email=email).count()             if count>0:                 raise authexception(backend, 'not unique email address.') 

the error raised @ browse: exception raised

so, wondering how redirect login page again message.

i tryed use httpredirect, works fine, not possible use django message framework during pipeline process.

please, note event happens in middle of pipeline process.

social_auth_pipeline = (     'social.pipeline.social_auth.social_details',     'social.pipeline.social_auth.social_uid',     'social.pipeline.social_auth.auth_allowed',     'social.pipeline.social_auth.social_user',     'account.my_pipeline.check_email',     'social.pipeline.user.get_username',     'social.pipeline.user.create_user',     'social.pipeline.social_auth.associate_user',     'social.pipeline.user.user_details' ) 

thanks