from flask import Blueprint

public = Blueprint('public', __name__)

@public.route('/')
def home():
  return 'hello flask'
app.py:

app = Flask(__name__)
app.config['SERVER_NAME'] = 'example.com'
from modules import public
app.register_blueprint(public, subdomain='public')

from flask import Blueprint

member = Blueprint('member', __name__)

@member.route('/')
def home():
  return g.subdomain
app.py:

app = Flask(__name__)
app.config['SERVER_NAME'] = 'example.com'
from modules import member
app.register_blueprint(member, subdomain='<subdomain>')

def add_subdomain_to_global(endpoint, values):
  g.subdomain = values.pop('subdomain', None)

def add_subdomain_to_url_params(endpoint, values):
  if not 'subdomain' in values:
    values['subdomain'] = g.subdomain

def add_subdomain_support(app):
  app.url_value_preprocessor(add_subdomain_to_global)
  app.url_defaults(add_subdomain_to_url_params)

add_subdomain_support(blueprint)

@blueprint.before_request
def add_user_to_global():
  g.user = None
  if g.subdomain:
    g.user = User.query.filter_by(username=g.subdomain).first_or_404()

a=Blueprint(‘a' ,__name__,subdomain='a')

@www.route(‘/hello',methods=['GET','POST'],subdomain='a')
def xxx():
…..

app.url_map.default_subdomain='www'

server {
server_name domain.com;
rewrite ^(.*) http://www.domain.com$1 permanent;
}