Flask - 請求和響應以及中間件

一、請求和響應

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():
 
        # 請求相關信息
        # 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))
 
        # 響應相關信息
        # return "字符串"
        # return render_template('html模板路徑',**{})
        # return redirect('/index.html')
 
        # response = make_response(render_template('index.html'))
        # response是flask.wrappers.Response類型
        # response.delete_cookie('key')
        # response.set_cookie('key', 'value')
        # response.headers['X-Something'] = 'A value'
        # return response
 
 
        return "內容"
 
    if __name__ == '__main__':
        app.run()

 

二、flask 如何傳參數到 js中，避免& # 39等轉義

經常會有字符 空格 ' "" 等被轉義成其他字符，這其實是特殊字符進行轉義,防止js注入

在js中可以利用tojson解決。

比如數組  num = ["ni"]，經過flask的 {{num}}傳入js后，就變成了'ni'

解決方法

利用js的tojson

var myGeocode = {{ num|tojson }};

 

三、中間件

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)