python案例中Flask全局配置示例详解

from flask import Flask
from flask import request
app = Flask(__name__)
@app.before_request
def ip_filter():
    black_list = [
        "127.0.0.1"
    ]
    remote_addr = request.remote_addr #获取请求用户ip
    if remote_addr in black_list:
        return "Not Allowed",405 
@app.route("/index")
def index():
    return "index"
if __name__ == '__main__':
    app.run()

from flask import Flask
from flask import request
app = Flask(__name__)
#....
app.before_request(ip_filter)
#.... 
if __name__ == '__main__':
    app.run()

from flask import Flask
app = Flask(__name__)
@app.route("/index")
def index():
    return {"data": {"nav":["index","news_list"]},"message": "success", "error_code": 1}
@app.after_request
def after_request_fun(response):
    response_format = {"data": {},"message": "success", "error_code": 1}
    if response.content_type == "application/json": #如果返回数据的类型是json
        json_data = response.json
        response_format.update(json_data)
    return response
# app.after_request(after_request_fun) 第二种写法
if __name__ == '__main__':
    app.run()

from flask import Flask
app = Flask(__name__)
@app.route("/index")
def index():
    return {"data": {"nav":["index","news_list"]},"message": "success", "error_code": 1}
class MiddleWare:
    def __init__(self, old_wsgi_app):
        self.old_wsgi_app = old_wsgi_app
    def __call__(self, environ, start_response):
        print('类似before_request')
        ret = self.old_wsgi_app(environ, start_response)
        print('类似after_request')
        return ret
if __name__ == '__main__':
    app.wsgi_app = MiddleWare(app.wsgi_app)
    app.run()