本文摘自php中文网，作者coldplay.xixi，侵删。
python视频教程栏目为大家介绍Python Flask解决跨域问题。
系列文章目录
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
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
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 expressionand(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,
andthe values must be a dictionary of kwargs, identical to the kwargs
of thisfunction.
If the argument is a list, it is expected to be a list of regular
expressions,forwhich the app-wide configured options are applied.
If the argument is a string, it is expected to be a regular expression
forwhich the app-wide configured options are applied.
Default : Match allandapply app-level configuration
:type resources: dict, iterableorstring
:param origins:
The origin,orlist of origins to allow requests from.
The origin(s) may be regular expressions,case-sensitive strings,
orelsean asterisk
Default :'*'
:type origins: list, stringorregex
:param methods:
The methodorlist of methods which the allowed origins are allowed to
accessfornon-simple requests.
Default : [GET, HEAD, POST, OPTIONS, PUT, PATCH,DELETE]
:type methods: listorstring
:param expose_headers:
The headerorlist which are safe to expose to the API of a CORS API
specification.
Default : None
:type expose_headers: listorstring
:param allow_headers:
The headerorlist 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,orelsean asterisk.
Default :'*', allow all headers
:type allow_headers: list, stringorregex
:param supports_credentials:
Allows users to make authenticated requests. If true, injects the
`Access-Control-Allow-Credentials` header in responses. This allows
cookiesandcredentials 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 timeforwhich this CORS request maybe cached. This value
is setasthe `Access-Control-Max-Age` header.
Default : None
:type max_age: timedelta, integer, stringorNone
:param send_wildcard: If True,andthe 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 returnedasper 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,andan Origin than'*'is returned) informs CDNsandother
caches that the CORS headers are dynamic,andcannot be cached.
If False, the Vary header will never be injectedoraltered.
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") returnf'Hello, {name}!'复制代码
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,orlist of origins to allow requests from.
The origin(s) may be regular expressions,case-sensitive strings,
orelsean asterisk
Default :'*'
:type origins: list, stringorregex
:param methods:
The methodorlist of methods which the allowed origins are allowed to
accessfornon-simple requests.
Default : [GET, HEAD, POST, OPTIONS, PUT, PATCH,DELETE]
:type methods: listorstring
:param expose_headers:
The headerorlist which are safe to expose to the API of a CORS API
specification.
Default : None
:type expose_headers: listorstring
:param allow_headers:
The headerorlist 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,orelsean asterisk.
Default :'*', allow all headers
:type allow_headers: list, stringorregex
:param supports_credentials:
Allows users to make authenticated requests. If true, injects the
`Access-Control-Allow-Credentials` header in responses. This allows
cookiesandcredentials 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 timeforwhich this CORS request maybe cached. This value
is setasthe `Access-Control-Max-Age` header.
Default : None
:type max_age: timedelta, integer, stringorNone
:param send_wildcard: If True,andthe 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 returnedasper 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
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