flaskcors跨域问题,

  flaskcors跨域问题,

  大蟒视频教程栏目为大家介绍蟒蛇皮烧瓶解决跨域问题。

  Table of Contents

  系列文章目录前言使用步骤1.引入库2.配置1.使用克-奥二氏分级量表函数配置全局路由2.使用@交叉起源来配置单行路由配置参数说明总结参考

我靠,又跨域了

  

系列文章目录

管道安装烧瓶-科尔斯复制代码

前言

烧瓶-科尔斯有两种用法,一种为全局使用,一种对指定的路由使用

  

使用步骤

从瓶进口烧瓶,请求从烧瓶_cors进口克-奥二氏分级量表

  app=Flask(__name__)

  CORS(app,supports_credentials=True)复制代码其中克-奥二氏分级量表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起源、方法、允许_头、支持_凭证

  所有的配置项如下:

  :参数资源:

  正则表达式系列和(可选)关联的克-奥二氏分级量表

  要应用于给定资源路径的选项。

  如果参数是一个字典,它的键必须是正则表达式,

  并且这些值必须是参数的字典,与参数相同

  这个函数。

  如果参数是一个列表,它应该是一个常规列表

  表达式,应用了应用程序范围内配置的选项。

  如果参数是一个字符串,它应该是一个正则表达式

  应用了应用程序范围内配置的选项。

  默认:匹配全部并应用应用程序级配置

  :类型资源:字典、可迭代或线

  :参数来源:

  允许请求的来源或来源列表。

  来源可以是正则表达式、区分大小写的字符串,

  或者一个星号

  默认: *

  :类型来源:列表、字符串或正则表达式

  :参数方法:

  允许原点允许的方法或方法列表

  非简单请求的访问。

  默认:[获取,标题,发布,选项,上传,修补,删除]

  :键入方法:列表或字符串

  :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_origin

  app = 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_originCORS 提供一些基本相同的参数。

  常用的我们可以配置 originsmethodsallow_headerssupports_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

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-HeadersNone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-CredentialsFalse是否允许请求发送cookiemax_agetimedelta、整数、字符串Access-Control-Max-AgeNone预检请求的有效时长

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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