对于 Flask
(how can I use data posted from ajax in flask?) 的以下 ajax
发布请求:
$.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 );
}
});
我收到了 Cross Origin Resource Sharing (CORS)
错误:
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.
我尝试通过以下两种方式解决它,但似乎都不起作用。
- 使用 Flask-CORS
这是一个用于处理 CORS
的 Flask
扩展,它应该使跨域 AJAX 成为可能。
- 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
我的 pythonServer.py 使用这个解决方案:
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()
- 使用特定的 Flask 装饰器
这是一个官方 Flask 代码片段,它定义了一个装饰器,该装饰器应该允许 CORS
在它所装饰的函数上。
- http://flask.pocoo.org/snippets/56/
- Python Flask cross site HTTP POST - doesn't work for specific allowed origins
- http://chopapp.com/#351l7gc3
我的 pythonServer.py 使用这个解决方案:
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()
您能否说明原因?
最佳答案
你可以用一个简单的方法得到结果:
@app.route('your route', methods=['GET'])
def yourMethod(params):
response = flask.jsonify({'some': 'data'})
response.headers.add('Access-Control-Allow-Origin', '*')
return response
关于javascript - 使用 Flask 解决跨域资源共享,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/26980713/