簡單利用poin的值去Python | Flask 解決跨域問題
阿新 • • 發佈:2020-11-07
本文的文字及圖片來源於網路,僅供學習、交流使用,不具有任何商業用途,版權歸原作者所有,如有問題請及時聯絡我們以作處理
以下文章來源於騰訊雲,作者:雙鬼帶單
Python | Flask 解決跨域問題
前言
又跨域了
使用步驟
1. 引入庫
pip install flask-cors
2. 配置
flask-cors 有兩種用法,一種為全域性使用,一種對指定的路由使用
1. 使用CORS函式
配置全域性路由
from flask import Flask, request from flask_cors import CORS app = Flask(__name__) CORS(app, supports_credentials=True)
其中 CORS 提供了一些引數幫助我們定製一下操作。
常用的我們可以配置 origins、methods、allow_headers、supports_credentials
所有的配置項如下:
:param resources: The series of regular expression and (optionally) associated CORS options to be applied to the given resource path. If the argument is a dictionary, it's keys must be regular expressions, and the values must be a dictionary of kwargs, identical to the kwargs of this function. If the argument is a list, it is expected to be a list of regular expressions, for which the app-wide configured options are applied. If the argument is a string, it is expected to be a regular expression for which the app-wide configured options are applied. Default : Match all and apply app-level configuration :type resources: dict, iterable or string :param origins: The origin, or list of origins to allow requests from. The origin(s) may be regular expressions, case-sensitive strings, or else an asterisk Default : '*' :type origins: list, string or regex :param methods: The method or list of methods which the allowed origins are allowed to access for non-simple requests. Default : [GET, HEAD, POST, OPTIONS, PUT, PATCH, DELETE] :type methods: list or string :param expose_headers: The header or list which are safe to expose to the API of a CORS API specification. Default : None :type expose_headers: list or string :param allow_headers: The header or list of header field names which can be used when this resource is accessed by allowed origins. The header(s) may be regular expressions, case-sensitive strings, or else an asterisk. Default : '*', allow all headers :type allow_headers: list, string or regex :param supports_credentials: Allows users to make authenticated requests. If true, injects the `Access-Control-Allow-Credentials` header in responses. This allows cookies and credentials to be submitted across domains. :note: This option cannot be used in conjuction with a '*' origin Default : False :type supports_credentials: bool :param max_age: The maximum time for which this CORS request maybe cached. This value is set as the `Access-Control-Max-Age` header. Default : None :type max_age: timedelta, integer, string or None :param send_wildcard: If True, and the origins parameter is `*`, a wildcard `Access-Control-Allow-Origin` header is sent, rather than the request's `Origin` header. Default : False :type send_wildcard: bool :param vary_header: If True, the header Vary: Origin will be returned as per the W3 implementation guidelines. Setting this header when the `Access-Control-Allow-Origin` is dynamically generated (e.g. when there is more than one allowed origin, and an Origin than '*' is returned) informs CDNs and other caches that the CORS headers are dynamic, and cannot be cached. If False, the Vary header will never be injected or altered. Default : True :type vary_header: bool
2. 使用@cross_origin
來配置單行路由
from flask import Flask, request from flask_cors import cross_origin app = Flask(__name__) @app.route('/') @cross_origin(supports_credentials=True) def hello(): name = request.args.get("name", "World") return f'Hello, {name}!'
其中 cross_origin 和 CORS 提供一些基本相同的引數。
常用的我們可以配置 origins、methods、allow_headers、supports_credentials
所有的配置項如下:
:param origins: The origin, or list of origins to allow requests from. The origin(s) may be regular expressions, case-sensitive strings, or else an asterisk Default : '*' :type origins: list, string or regex :param methods: The method or list of methods which the allowed origins are allowed to access for non-simple requests. Default : [GET, HEAD, POST, OPTIONS, PUT, PATCH, DELETE] :type methods: list or string :param expose_headers: The header or list which are safe to expose to the API of a CORS API specification. Default : None :type expose_headers: list or string :param allow_headers: The header or list of header field names which can be used when this resource is accessed by allowed origins. The header(s) may be regular expressions, case-sensitive strings, or else an asterisk. Default : '*', allow all headers :type allow_headers: list, string or regex :param supports_credentials: Allows users to make authenticated requests. If true, injects the `Access-Control-Allow-Credentials` header in responses. This allows cookies and credentials to be submitted across domains. :note: This option cannot be used in conjuction with a '*' origin Default : False :type supports_credentials: bool :param max_age: The maximum time for which this CORS request maybe cached. This value is set as the `Access-Control-Max-Age` header. Default : None :type max_age: timedelta, integer, string or None :param send_wildcard: If True, and the origins parameter is `*`, a wildcard `Access-Control-Allow-Origin` header is sent, rather than the request's `Origin` header. Default : False :type send_wildcard: bool :param vary_header: If True, the header Vary: Origin will be returned as per the W3 implementation guidelines. Setting this header when the `Access-Control-Allow-Origin` is dynamically generated (e.g. when there is more than one allowed origin, and an Origin than '*' is returned) informs CDNs and other caches that the CORS headers are dynamic, and cannot be cached. If False, the Vary header will never be injected or altered. Default : True :type vary_header: bool :param automatic_options: Only applies to the `cross_origin` decorator. If True, Flask-CORS will override Flask's default OPTIONS handling to return CORS headers for OPTIONS requests. Default : True :type automatic_options: bool
配置引數說明
總結
在 flask 的跨域配置中,我們可以使用 flask-cors 來進行配置,其中 CORS 函式 用來做全域性的配置, @cross_origin 來實現特定路由的配置