python视频教程栏目为大家介绍Python Flask解决跨域问题。
系列文章目录
Table of Contents
系列文章目录前言使用步骤1. 引入库2. 配置1. 使用 CORS函数 配置全局路由2. 使用 @cross_origin 来配置单行路由配置参数说明总结参考前言
我靠，又跨域了
使用步骤1. 引入库
pip install flask-cors复制代码
2. 配置
flask-cors 有两种用法，一种为全局使用，一种对指定的路由使用
1. 使用 CORS函数 配置全局路由
from flask import Flask, requestfrom flask_cors import CORSapp = Flask(__name__)CORS(app, supports_credentials=True)复制代码
其中 CORS 提供了一些参数帮助我们定制一下操作。
常用的我们可以配置 origins、methods、allow_headers、supports_credentials
所有的配置项如下：
: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复制代码
2. 使用 @cross_origin 来配置单行路由
from flask import Flask, requestfrom flask_cors import cross_originapp = Flask(__name__)@app.route('/')@cross_origin(supports_credentials=True)def hello(): name = request.args.get("name", "World") return f'Hello, {name}!'复制代码
其中 cross_origin 和 CORS 提供一些基本相同的参数。
常用的我们可以配置 origins、methods、allow_headers、supports_credentials
所有的配置项如下：
: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复制代码
配置参数说明
总结
在 flask 的跨域配置中，我们可以使用 flask-cors 来进行配置，其中 CORS 函数 用来做全局的配置, @cross_origin 来实现特定路由的配置。
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