小編給大家分享一下Python Flask如何解決跨域問題，相信大部分人都還不怎么了解，因此分享這篇文章給大家參考一下，希望大家閱讀完這篇文章后大有收獲，下面讓我們一起去了解一下吧！
pip install flask-cors復制代碼
flask-cors 有兩種用法，一種為全局使用，一種對指定的路由使用
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重慶分公司
CORS函數(shù) 配置全局路由from flask import Flask, requestfrom flask_cors import CORS app = Flask(__name__) CORS(app, supports_credentials=True)復制代碼
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復制代碼@cross_origin 來配置單行路由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}!'復制代碼其中 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復制代碼| 參數(shù) | 類型 | Head | 默認 | 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] | 配置跨域支持的請求方式 |
| expose_headers | 列表、字符串 | Access-Control-Expose-Headers | None | 自定義請求響應的Head信息 |
| allow_headers | 列表、字符串或正則表達式 | Access-Control-Request-Headers | * | 配置允許跨域的請求頭 |
| supports_credentials | 布爾值 | Access-Control-Allow-Credentials | False | 是否允許請求發(fā)送cookie |
| max_age | timedelta、整數(shù)、字符串 | Access-Control-Max-Age | None | 預檢請求的有效時長 |
在 flask 的跨域配置中，我們可以使用 flask-cors 來進行配置，其中 CORS 函數(shù) 用來做全局的配置, @cross_origin 來實現(xiàn)特定路由的配置。
以上是Python Flask如何解決跨域問題的所有內(nèi)容，感謝各位的閱讀！相信大家都有了一定的了解，希望分享的內(nèi)容對大家有所幫助，如果還想學習更多知識，歡迎關(guān)注創(chuàng)新互聯(lián)-成都網(wǎng)站建設公司行業(yè)資訊頻道！
