AngularJS、PHP Restful Cors 问题

我在尝试对我的其余 php 服务器进行 $http 调用时遇到问题。 我正在进行从客户端到后端的跨域调用。

在我的 Angular 应用程序中，$http 服务的配置方式如下：

.config(['$httpProvider', function($httpProvider) {
    $httpProvider.interceptors.push('httpResponseInterceptor');
    $httpProvider.interceptors.push('httpTimeStampMarker');
    $httpProvider.defaults.useXDomain = true;
    $httpProvider.defaults.headers.post['Access-Control-Allow-Origin'] = '*';
    $httpProvider.defaults.headers.post['Content-Type'] = 'application/x-www-form-urlencoded';
    delete $httpProvider.defaults.headers.common['Content-Type, X-Requested-With'];
}])

这就是实际 $http.post() 的配置方式：

    // Set the headers
    var headers = {
        'Access-Control-Allow-Origin': '*',
        'Access-Control-Allow-Methods': 'POST, GET, OPTIONS, PUT',
        'Content-Type': 'application/x-www-form-urlencoded',
        'Accept': '*'
    };

    return $http({
            method: "POST",
            url: base_url,
            data: $.param(args),
            headers: headers
        })
        .success(function(data, status) {

        })
        .error(function(data, status) {

        });

这是服务器的 .htaccess：

# Cors
Header add Access-Control-Allow-Origin "*"
Header add Access-Control-Allow-Headers "Origin, X-Requested-With, Content-Type, Access-Control-Allow-Origin, Access-Control-Allow-Methods"
Header add Access-Control-Allow-Methods "PUT, GET, POST, DELETE, OPTIONS"

预检请求进展顺利：

**Request headers:**
Accept:*/*
Accept-Encoding:gzip, deflate, sdch
Accept-Language:en-US,en;q=0.8
Access-Control-Request-Headers:access-control-allow-origin, accept, access-control-allow-methods, content-type
Access-Control-Request-Method:POST
Connection:keep-alive
Host:***
Origin:***
Referer:***
User-Agent:Mozilla/5.0 (Macintosh; Intel Mac OS X 10_10_1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/39.0.2171.95 Safari/537.36

**Response headers**
Access-Control-Allow-Headers:Origin, X-Requested-With, Content-Type, Access-Control-Allow-Origin, Access-Control-Allow-Methods
Access-Control-Allow-Methods:PUT, GET, POST, DELETE, OPTIONS
Access-Control-Allow-Origin:*
Allow:OPTIONS,GET,HEAD,POST
Connection:Keep-Alive
Content-Length:0
Content-Type:httpd/unix-directory
Date:Fri, 26 Dec 2014 07:12:24 GMT
Keep-Alive:timeout=5, max=100
Server:Apache/2.4.9 (Unix) PHP/5.6.2

然而实际的 post 请求失败了：

XMLHttpRequest cannot load http://***/. No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin '***' is therefore not allowed access. The response had HTTP status code 404.

这些是请求和响应标头：

**Request headers**
    Accept:*
    Accept-Encoding:gzip, deflate
    Accept-Language:en-US,en;q=0.8
    Access-Control-Allow-Methods:POST, GET, OPTIONS, PUT
    Access-Control-Allow-Origin:*
    Connection:keep-alive
    Content-Length:130
    Content-Type:application/x-www-form-urlencoded
    Host:***
    Origin:http://***
    Referer:***
    User-Agent:Mozilla/5.0 (Macintosh; Intel Mac OS X 10_10_1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/39.0.2171.95 Safari/537.36


**Response headers**
Connection:Keep-Alive
Content-Length:198
Content-Type:text/html; charset=iso-8859-1
Date:Fri, 26 Dec 2014 07:12:24 GMT
Keep-Alive:timeout=5, max=99
Server:Apache/2.4.9 (Unix) PHP/5.6.2

我显然在发布请求的响应中缺少一些标头。

然而，它失败的问题确实在预检请求中有效。我尝试在其余服务器的index.php 中添加一些标头，但是请求没有到达那里并且更早地被卡住（我猜测是在加载.htaccess 时）。

我在这里缺少什么？

几个小时后我终于发现了。

我的.htaccess：

# Cors
Header always set Access-Control-Allow-Origin "*"
Header always set Access-Control-Allow-Headers "Origin, X-Requested-With, Content-Type, Access-Control-Allow-Origin"
Header always set Access-Control-Allow-Methods "PUT, GET, POST, DELETE, OPTIONS"

@Alexey Rodin 给出的提示几乎是正确的。不应将“add”更改为“set”，而应将其设置为“always set”。

This site http://blog.bulte.net/12-24-2013/angular-wordpress-cors.html帮助我：

关于 AngularJS，我可以确认 CORS 不需要其他设置即可工作。 因此 Angular 的 $http 不需要通过标头等进行更改，默认设置应该与上述 .htaccess 条目一起使用。