python flask跨域处理

from flask_cors import CORS
app = Flask(__name__)
CORS(app)

# 跨域支持#
def after_request(resp):
    resp.headers['Access-Control-Allow-Origin'] = '*'
    # resp.setHeader("Access-Control-Allow-Headers", "content-type,XXX");
    # resp.setHeader("Access-Control-Allow-Methods", "*");
    # resp.setHeader("Access-Control-Allow-Origin", "http://192.168.30.5:8081");
    # resp.setHeader("Access-Control-Allow-Credentials", "true");
    return resp

app = Flask(__name__)

# cors_allowed_origins   指定允许跨域地址
socketio = SocketIO(app,cors_allowed_origins="http://192.168.30.5:8081")
# socketio = SocketIO(app,cors_allowed_origins="*")