我很困惑，我不明白为什么当POST、PUT和GET工作正常时，DELETE请求没有通过。我很确定我已经做了CORS工作所需的每一个配置。我使用的是AngularJS和Flask-CORS扩展
这是我目前的工作：
Angular 配置：

angular.module('...' [...]).config(function($httpProvider) {
  $httpProvider.defaults.useXDomain = true;
  delete $httpProvider.defaults.headers.common['X-Requested-With'];
});

Angular 工厂：

angular.module('...').factory('...'), function($http) {
  return {
    deleteElectronicAddress: function (partyId, contactMechanismId) {
      return $http({
        url: urlBase + 'party/' + partyId + '/contact-mechanism/' + contactMechanismId,
        method: 'DELETE',
      });
    },

    someMoreMethods: { ... }
  }
}

我的Flask代码（我使用Miguel Grinberg在他的书Flask Web Development中提出的应用程序结构）
config.py

class Config:
    ...

    CORS_HEADERS = 'Content-Type'
    CORS_RESOURCES = {r"/api/*": {"origins": "*"}}
    CORS_METHODS = ['GET', 'POST', 'DELETE', 'PUT', 'OPTIONS', 'HEAD']

    ...

项目文件夹/应用程序/初始化.py：

from flask import Flask
from flask.ext.sqlalchemy import SQLAlchemy
from flask.ext.cors import CORS
from config import config

db = SQLAlchemy()

def create_app(config_name):
    app = Flask(__name__)
    app.config.from_object(config[config_name])
    config[config_name].init_app(app)

    db.init_app(app)
    CORS(app)

    from .api_1_0 import api as api_1_0_blueprint
    app.register_blueprint(api_1_0_blueprint, url_prefix='/api/v1.0')

    return app

我目前使用的是Flask-CORS v1.7.4。
项目文件夹/应用程序/API/参与方联系机制.py：

from datetime import date
from flask import jsonify
from .. import db
from ..models import PartyContactMechanism
from . import api

@api.route(
'/party/<int:party_id>' +
'/contact-mechanism/<int:contact_mechanism>', methods=['DELETE'])
def unlink_party_contact_mechanism(party_id, contact_mechanism):
"""Unlink the contact mechanism onto the party."""
     party_contact = PartyContactMechanism.query \
        .filter_by(party_id=party_id) \
        .filter_by(contact_mechanism_id=contact_mechanism) \
        .first()

     party_contact.thru_date = str(date.today())

     db.session.commit()

     return jsonify(success=True)

我已经用httpie测试过了，既在我的本地机器上，也在另一台连接到局域网的机器上，效果都很好。
我运行的Angular 和 flask 与0.0.0.0主机配置，以便它可以访问其他机器上连接的网络。
下面是从浏览器调用时请求和响应头
申请标题：

OPTIONS /api/v1.0/party/32232/contact-mechanism/80667 HTTP/1.1
Host: 10.61.18.217:5000
User-Agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:31.0) Gecko/20100101      Firefox/31.0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Language: en-US,en;q=0.5
Accept-Encoding: gzip, deflate
Origin: http://0.0.0.0:9000
Access-Control-Request-Method: DELETE
Connection: keep-alive

回复标题：

HTTP/1.0 200 OK
Content-Type: text/html; charset=utf-8
Allow: POST, OPTIONS, DELETE
access-control-allow-origin: *
Access-Control-Allow-Methods: POST
Access-Control-Allow-Headers: Content-Type
Content-Length: 0
Server: Werkzeug/0.9.6 Python/2.7.6
Date: Mon, 18 Aug 2014 07:20:18 GMT

这里是当从httpie调用时的请求和响应报头：
申请标题：

DELETE /api/v1.0/party/32232/contact-mechanism/80667 HTTP/1.1
Accept: */*
Accept-Encoding: gzip, deflate, compress
Content-Length: 0
Host: 10.61.18.217:5000
User-Agent: HTTPie/0.8.0

回复标题：

HTTP/1.0 200 OK
Access-Control-Allow-Headers: Content-Type
Access-Control-Allow-Methods: DELETE, GET, HEAD, OPTIONS, POST, PUT
Access-Control-Allow-Origin: *
Content-Length: 21
Content-Type: application/json
Date: Mon, 18 Aug 2014 07:31:05 GMT
Server: Werkzeug/0.9.6 Python/2.7.6

{
   "success": true
}