flaskcors跨域问题,
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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其中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
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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