javascript – ExtJS,Flask和AJAX：跨域请求

我正在使用ExtJS(客户端)和Flask(服务器)开发RESTful应用程序：客户端和服务器通过协议链接.

当我尝试向服务器发出AJAX请求时出现问题,如下所示：

Ext.Ajax.request ({
    url: 'http://localhost:5000/user/update/' + userId ,
    method: 'POST' ,
    xmlData: xmlUser ,
    disableCaching: false ,
    headers: {
        'Content-Type': 'application/xml'
    } ,
    success: function (res) {
        // something here
    } ,
    failure: function (res) {
        // something here
    }
});

根据上述请求,客户端正在尝试更新用户信息.
不幸的是,这是一个跨域请求(details).

服务器处理该请求,如下所示：

@app.route ("/user/update/<user_id>", methods=['GET', 'POST'])
def user_update (user_id):
  return user_id

我在浏览器控制台上看到的是OPTIONS请求而不是POST.
然后,我尝试在80端口启动Flask应用程序,但显然不可能：

app.run (host="127.0.0.1", port=80)

总之,如果客户端无法执行任何AJAX请求,我不明白客户端如何与服务器进行交互.

我怎样才能解决这个问题？

解决方法:

这是CORS与Flask的优秀设计师.

http://flask.pocoo.org/snippets/56/

如果链接失效,这是后代的代码：

from datetime import timedelta
from flask import make_response, request, current_app
from functools import update_wrapper


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