在生产中AIP要跨域请求,flask设置跨域请求。
flask-cors文档链接
https://flask-cors.readthedocs.io/en/latest/
安装flask-cors
pip install flask-cors
使用配置
1.flask-cors 全局使用
2.flask-cors也指定的路由使用
1. flask-cors 全局使用 CORS函数全局路由配置
from flask import Flask, requestfrom flask_cors import CORSapp = Flask(__name__)CORS(app, supports_credentials=True)
其中 CORS 参数配置 origins、methods、allow_headers、supports_credentials
""" :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 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}!'
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
""" This function is the decorator which is used to wrap a Flask route with. In the simplest case, simply use the default parameters to allow all origins in what is the most permissive configuration. If this method modifies state or performs authentication which may be brute-forced, you should add some degree of protection, such as Cross Site Forgery Request protection. :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
配置参数说明
参数 | 类型 | Head | 默认 | 说明 |
---|---|---|---|---|
resources | 字典、迭代器或字符串 | 无 | 全部 | 配置允许跨域的路由接口 |
origins | 列表、字符串或正则表达式 | Access-Control-Allow-Origin | * | 配置允许跨域访问的源 |
methods | 列表、字符串 | Access-Control-Allow-Methods | [GET, HEAD, POST, OPTIONS, PUT, PATCH, DELETE] | 配置跨域支持的请求方式 |
expose_headers | 列表、字符串 | Access-Control-Expose-Headers | None | 自定义请求响应的Head信息 |
allow_headers | 列表、字符串或正则表达式 | Access-Control-Request-Headers | * | 配置允许跨域的请求头 |
supports_credentials | 布尔值 | Access-Control-Allow-Credentials | False | 是否允许请求发送cookie |
max_age | timedelta、整数、字符串 | Access-Control-Max-Age | None | 预检请求的有效时长 |