Flask - 请求和响应以及中间件

一、请求和响应

from flask import Flask
    from flask import request
    from flask import render_template
    from flask import redirect
    from flask import make_response
 
    app = Flask(__name__)
 
 
    @app.route('/login.html', methods=['GET', "POST"])
    def login():
 
        # 请求相关信息
        # request.method
        # request.args
        # request.form
        # request.values
        # request.cookies
        # request.headers
        # request.path
        # request.full_path
        # request.script_root
        # request.url
        # request.base_url
        # request.url_root
        # request.host_url
        # request.host
        # request.files
        # obj = request.files['the_file_name']
        # obj.save('/var/www/uploads/' + secure_filename(f.filename))
 
        # 响应相关信息
        # return "字符串"
        # return render_template('html模板路径',**{})
        # return redirect('/index.html')
 
        # response = make_response(render_template('index.html'))
        # response是flask.wrappers.Response类型
        # response.delete_cookie('key')
        # response.set_cookie('key', 'value')
        # response.headers['X-Something'] = 'A value'
        # return response
 
 
        return "内容"
 
    if __name__ == '__main__':
        app.run()

 

二、flask 如何传参数到 js中，避免& # 39等转义

经常会有字符 空格 ' "" 等被转义成其他字符，这其实是特殊字符进行转义,防止js注入

在js中可以利用tojson解决。

比如数组  num = ["ni"]，经过flask的 {{num}}传入js后，就变成了'ni'

解决方法

利用js的tojson

var myGeocode = {{ num|tojson }};

 

三、中间件

from flask import Flask, flash, redirect, render_template, request
  
app = Flask(__name__)
app.secret_key = 'some_secret'
  
@app.route('/')
def index1():
    return render_template('index.html')
  
@app.route('/set')
def index2():
    v = request.args.get('p')
    flash(v)
    return 'ok'
  
class MiddleWare:
    def __init__(self,wsgi_app):
        self.wsgi_app = wsgi_app
  
    def __call__(self, *args, **kwargs):
  
        return self.wsgi_app(*args, **kwargs)
  
if __name__ == "__main__":
    app.wsgi_app = MiddleWare(app.wsgi_app)
    app.run(port=9999)