Python ビデオ チュートリアル コラムでは、クロスドメインの問題を解決するための Python Flask を紹介します。
#目次
グローバル ルーティングを構成するには
を使用して単一回線ルーティングを構成します
1. ライブラリをインポートします
pip install flask-cors复制代码
グローバル ルーティングを構成する
from flask import Flask, requestfrom flask_cors import CORS app = Flask(__name__) CORS(app, supports_credentials=True)复制代码
CORS は、操作のカスタマイズに役立ついくつかのパラメーターを提供します。 一般的に使用される origins、
、allow_headers、supports_credentials を設定できます。 #すべての設定項目は次のとおりです:
: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复制代码2. @cross_origin を使用して単一行ルーティングを設定します
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cross_origin は、本質的に同じパラメータをいくつか提供します。 一般的に使用される origins、
、allow_headers、supports_credentials を設定できます。 #すべての設定項目は次のとおりです:
: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复制代码設定パラメータの説明
| #デフォルト | 説明 | リソース | ||
|---|---|---|---|---|
| クロスドメイン ルーティングを許可するルーティング インターフェイスの構成 | origins | リスト、文字列、または正規表現 | Access-Control-Allow-Origin | |
| クロスドメイン アクセスを許可するオリジンを構成する | メソッド | List, string | Access-Control-Allow-Methods | |
| クロスドメイン サポート リクエストの構成メソッド | expose_headers | リスト、文字列 | Access-Control-Expose-Headers | |
| カスタマイズリクエスト レスポンス ヘッド情報 | allow_headers | リスト、文字列、または正規表現 | Access-Control-Request-Headers | |
| クロスドメイン要求ヘッダーの構成 | ##supports_credentials | ブール値 | Access-Control-Allow-Credentials | |
| #リクエストに Cookie の送信を許可するかどうか | ##max_age | timedelta、整数、文字列 | Access-Control-Max-Age | なし |
| ##概要 | フラスコのクロスドメイン構成では、次のことができます。設定には | flask-cors | を使用します。CORS 関数 | はグローバル設定に使用され、
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