python 동영상 튜토리얼 칼럼에서는 도메인 간 문제를 해결하기 위한 Python Flask를 소개합니다.

머리말`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

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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 CORS

app = Flask(__name__)
CORS(app, supports_credentials=True)复制代码

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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&#39;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 : &#39;*&#39;
: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 : &#39;*&#39;, 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 &#39;*&#39; 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&#39;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 &#39;*&#39; 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

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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(&#39;/&#39;)@cross_origin(supports_credentials=True)def hello():
    name = request.args.get("name", "World")    return f&#39;Hello, {name}!&#39;复制代码

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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 : &#39;*&#39;
: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 : &#39;*&#39;, 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 &#39;*&#39; 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&#39;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 &#39;*&#39; 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&#39;s default OPTIONS handling to return CORS headers for
    OPTIONS requests.

    Default : True
:type automatic_options: bool复制代码

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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

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

젠장, 또 크로스 도메인이군요

사용 단계

1. 라이브러리 가져오기
rrreee
2. 구성
flask-cors에는 두 가지 용도가 있습니다. 하나는 전역 사용용이고 다른 하나는 지정된 경로용입니다.
1. CORS 기능을 사용하여 전역 라우팅을 구성합니다.
rrreee여기서 CORS는 몇 가지 매개변수를 제공합니다. 작업을 사용자 정의합니다. 일반적으로 사용되는 origins, methods, allow_headers, supports_credentials를 구성할 수 있습니다

모든 구성 항목은 다음과 같습니다. ：🎜🎜rrreee

2. `@cross_origin`을 사용하여 단일 회선 라우팅을 구성합니다.

rrreee🎜여기서 cross_origin CORS는 본질적으로 동일한 매개변수를 제공합니다. 🎜🎜일반적으로 사용되는 origins, methods, allow_headers, supports_credentials를 구성할 수 있습니다🎜🎜🎜모든 구성 항목은 다음과 같습니다. 다음 ：🎜🎜rrreee

구성 매개변수 설명

없음

매개변수	유형	헤드	기본값	설명 번째>
리소스	사전, 반복자 또는 문자열	모두	교차 도메인 라우팅을 허용하는 라우팅 인터페이스 구성
원본	목록, 문자열 또는 정규 표현식	Access-Control-Allow-Origin	*	교차 도메인 액세스를 허용하는 소스 구성
메소드	목록, 문자열	접근 제어 허용 메소드	[GET , HEAD, POST, OPTIONS, PUT, PATCH, DELETE]	교차 도메인 지원을 위한 요청 방법 구성
노출_헤더	목록, 문자열	액세스 제어-노출-헤더	없음	요청 응답 헤드 정보 사용자 정의
allow_headers	목록, 문자열 또는 정규 표현식	Access-Control-Request-Headers	*	교차 도메인 요청 헤더 구성
supports_credentials	부울 값	Access-Control-Allow-Credentials	False	쿠키 전송 요청 허용 여부
max_age	timedelta, 정수, 문자열	Access-Control-Max-Age	없음	실행 전 요청의 유효 기간