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Python中怎么使用Flask 解決跨域問題,很多新手對(duì)此不是很清楚,為了幫助大家解決這個(gè)難題,下面小編將為大家詳細(xì)講解,有這方面需求的人可以來學(xué)習(xí)下,希望你能有所收獲。
pip install flask-cors
flask-cors 有兩種用法,一種為全局使用,一種對(duì)指定的路由使用
CORS函數(shù)
配置全局路由from flask import Flask, request from flask_cors import CORS app = Flask(__name__) CORS(app, supports_credentials=True)
其中 CORS
提供了一些參數(shù)幫助我們定制一下操作。
常用的我們可以配置 origins
、methods
、allow_headers
、supports_credentials
所有的配置項(xiàng)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
@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參數(shù)。
常用的我們可以配置 origins
、methods
、allow_headers
、supports_credentials
所有的配置項(xiàng)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
參數(shù) | 類型 | Head | 默認(rèn) | 說明 |
---|---|---|---|---|
resources | 字典、迭代器或字符串 | 無 | 全部 | 配置允許跨域的路由接口 |
origins | 列表、字符串或正則表達(dá)式 | Access-Control-Allow-Origin | * | 配置允許跨域訪問的源 |
methods | 列表、字符串 | Access-Control-Allow-Methods | [GET, HEAD, POST, OPTIONS, PUT, PATCH, DELETE] | 配置跨域支持的請(qǐng)求方式 |
expose_headers | 列表、字符串 | Access-Control-Expose-Headers | None | 自定義請(qǐng)求響應(yīng)的Head信息 |
allow_headers | 列表、字符串或正則表達(dá)式 | Access-Control-Request-Headers | * | 配置允許跨域的請(qǐng)求頭 |
supports_credentials | 布爾值 | Access-Control-Allow-Credentials | False | 是否允許請(qǐng)求發(fā)送cookie |
max_age | timedelta、整數(shù)、字符串 | Access-Control-Max-Age | None | 預(yù)檢請(qǐng)求的有效時(shí)長(zhǎng) |
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