用Flask解决跨源数据共享问题 [英] Solve Cross Origin Resource Sharing with Flask
问题描述
以下 ajax
对 Flask
(如何使用从ajax发布的数据?):
$。ajax({
url:http://127.0.0.1:5000/foo,
type:POST ,
contentType:application / json,
data:JSON.stringify({'inputVar':1}),
success:function(data){
alert 成功+数据);
}
});
我得到 跨源资源共享(CORS)
错误:
否请求的资源上存在Access-Control-Allow-Origin标题。
原因'null'因此不被允许访问。
响应的HTTP状态码为500.
我尝试用以下两种方法解决,但看起来没有任何作用。
$ b
- 使用Flask-CORS
- http://flask-cors.readthedocs.org/zh/latest/ 如何在flask和heroku中启用CORS >
- Javascript - 没有Access-Control-Allow-Origin标题出现在请求的资源上
- 使用特定的Flask Decorator
- http://flask.pocoo.org/snippets/56/
- Python Flask跨网站HTTP POST - 不适用于特定的允许来源 http://chopapp.com/#351l7gc3
- Using Flask-CORS
- http://flask-cors.readthedocs.org/en/latest/
- How to enable CORS in flask and heroku
- Flask-cors wrapper not working when jwt auth wrapper is applied.
- Javascript - No 'Access-Control-Allow-Origin' header is present on the requested resource
- Using specific Flask Decorator
- http://flask.pocoo.org/snippets/56/
- Python Flask cross site HTTP POST - doesn't work for specific allowed origins
- http://chopapp.com/#351l7gc3
ol>
这是一个 Flask
扩展,用于处理 CORS
可能是跨网站AJAX。
我的 pythonServer.py 使用此解决方案:
from flask import Flask
from flask.ext .cors import CORS,cross_origin
app = Flask(__ name__)
cors = CORS(app,resources = {r/ foo:{origins:*}})
app.config ['CORS_HEADERS'] ='Content-Type'
@ app.route('/ foo',methods = ['POST','OPTIONS'])
@cross_origin(origin ='*',headers = ['Content-Type','Authorization'])
def foo():
return request.json ['inputVar']
if __name__ =='__main__':
app.run()
官方 Flask代码片段定义了一个装饰器,它应该允许 CORS
对其进行装饰。
我的 pythonServer.py 使用这个解决方案:
from flask import Flask,make_response,request,current_app $ b $ from datetime import timedelta
from functools import update_wrapper
$ b $ app = Flask(__ name__)
$ b $ def def crossdomain(origin = None,methods = None,headers = None,
max_age = 21600,attach_to_all =真,
automatic_options =真):
如果方法不是无:
methods =','.join(对方法中的x进行排序(x.upper()))
如果标题不是None而不是isinstance(headers,basestring):
headers =','.join(x.upper()for x in header)
如果不是isinstance(origin,basestring):
origin =','.join(origin)
如果isinstance(max_age,timedelta):
max_age = max_age.total_seconds()
$ b $ def get_methods():
如果方法不是None:
返回方法
options_resp = current_app.make_default_options_response()
返回options_resp.headers ['allow']
def decorator(f):
def wrapped_function(* args,** kwargs):
if auto_options and request.method =='OPTIONS':
resp = current_app.make_default_options_response()
else:
resp = make_response(f(* args,** kwargs))
如果不是attach_to_all和request.method!='OPTIONS':
return resp
h = r esp.headers
$ bh ['Access-Control-Allow-Origin'] = origin $ b $ ['Access-Control-Allow-Methods'] = get_methods()$ b $ ['Access -Control-Max-Age'] = str(max_age)
如果标题不是无:
h ['Access-Control-Allow-Headers'] =标题
return resp
f.provide_automatic_options = False
return update_wrapper(wrapped_function,f)
返回装饰器
@ app.route('/ foo',methods = ['GET' ,'POST','OPTIONS'])
@crossdomain(origin =*)
def foo():
返回request.json ['inputVar']
if __name__ =='__main__':
app.run()
<你可以给一些为什么是这样的指示吗?
它像一个冠军,修改了一下你的代码。 nitialization
app = Flask(__ name__)
app.config ['SECRET_KEY'] ='快速的棕色狐狸跳过懒狗'
app.config ['CORS_HEADERS'] ='内容类型'
cors = CORS(app,resources = {r/ foo:{origins:http:// localhost:port}})
@ app.route('/ foo',methods = ['POST'])
@cross_origin(origin ='localhost',headers = ['Content- Type','Authorization'])
def foo():
return request.json ['inputVar']
if __name__ =='__main__':
app.run()
我用localhost替换了*。因为正如我在许多博客和文章中读到的,您应该允许访问特定的域名
For the following ajax
post request for Flask
(how can I use data posted from ajax in flask?):
$.ajax({
url: "http://127.0.0.1:5000/foo",
type: "POST",
contentType: "application/json",
data: JSON.stringify({'inputVar': 1}),
success: function( data ) {
alert( "success" + data );
}
});
I get a Cross Origin Resource Sharing (CORS)
error:
No 'Access-Control-Allow-Origin' header is present on the requested resource.
Origin 'null' is therefore not allowed access.
The response had HTTP status code 500.
I tried solving it in the two following ways, but none seems to work.
This is a Flask
extension for handling CORS
that should make cross-origin AJAX possible.
My pythonServer.py using this solution:
from flask import Flask
from flask.ext.cors import CORS, cross_origin
app = Flask(__name__)
cors = CORS(app, resources={r"/foo": {"origins": "*"}})
app.config['CORS_HEADERS'] = 'Content-Type'
@app.route('/foo', methods=['POST','OPTIONS'])
@cross_origin(origin='*',headers=['Content-Type','Authorization'])
def foo():
return request.json['inputVar']
if __name__ == '__main__':
app.run()
This is an official Flask code snippet defining a decorator that should allow CORS
on the functions it decorates.
My pythonServer.py using this solution:
from flask import Flask, make_response, request, current_app
from datetime import timedelta
from functools import update_wrapper
app = Flask(__name__)
def crossdomain(origin=None, methods=None, headers=None,
max_age=21600, attach_to_all=True,
automatic_options=True):
if methods is not None:
methods = ', '.join(sorted(x.upper() for x in methods))
if headers is not None and not isinstance(headers, basestring):
headers = ', '.join(x.upper() for x in headers)
if not isinstance(origin, basestring):
origin = ', '.join(origin)
if isinstance(max_age, timedelta):
max_age = max_age.total_seconds()
def get_methods():
if methods is not None:
return methods
options_resp = current_app.make_default_options_response()
return options_resp.headers['allow']
def decorator(f):
def wrapped_function(*args, **kwargs):
if automatic_options and request.method == 'OPTIONS':
resp = current_app.make_default_options_response()
else:
resp = make_response(f(*args, **kwargs))
if not attach_to_all and request.method != 'OPTIONS':
return resp
h = resp.headers
h['Access-Control-Allow-Origin'] = origin
h['Access-Control-Allow-Methods'] = get_methods()
h['Access-Control-Max-Age'] = str(max_age)
if headers is not None:
h['Access-Control-Allow-Headers'] = headers
return resp
f.provide_automatic_options = False
return update_wrapper(wrapped_function, f)
return decorator
@app.route('/foo', methods=['GET','POST','OPTIONS'])
@crossdomain(origin="*")
def foo():
return request.json['inputVar']
if __name__ == '__main__':
app.run()
Can you please give some some indication of why that is?
@Matt:
It worked like a champ, after bit modification to your code
# initialization
app = Flask(__name__)
app.config['SECRET_KEY'] = 'the quick brown fox jumps over the lazy dog'
app.config['CORS_HEADERS'] = 'Content-Type'
cors = CORS(app, resources={r"/foo": {"origins": "http://localhost:port"}})
@app.route('/foo', methods=['POST'])
@cross_origin(origin='localhost',headers=['Content- Type','Authorization'])
def foo():
return request.json['inputVar']
if __name__ == '__main__':
app.run()
I replaced * by localhost. Since as I read in many blogs and posts, you should allow access for specific domain
这篇关于用Flask解决跨源数据共享问题的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!