如何获得跨源资源共享(CORS)后请求工作

我在本地局域网(machineA)上有一台机器，它有两个web服务器。第一个是XBMC中的内置程序(在端口8080上)，它显示我们的库。第二个服务器是一个CherryPy python脚本(端口8081)，我用它按需触发文件转换。文件转换由XBMC服务器提供的页面的AJAX POST请求触发。

转到http://machineA:8080，显示库显示Library。用户单击“转换”链接，发出以下命令-

jQuery Ajax请求

$.post('http://machineA:8081', {file_url: 'asfd'}, function(d){console.log(d)})

浏览器发出一个带有以下报头的HTTP OPTIONS请求;

请求头- OPTIONS

Host: machineA:8081
User-Agent: ... Firefox/4.01
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
Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7
Keep-Alive: 115
Connection: keep-alive
Origin: http://machineA:8080
Access-Control-Request-Method: POST
Access-Control-Request-Headers: x-requested-with

服务器响应如下;

响应头- OPTIONS (STATUS = 200 OK)

Content-Length: 0
Access-Control-Allow-Headers: *
Access-Control-Max-Age: 1728000
Server: CherryPy/3.2.0
Date: Thu, 21 Apr 2011 22:40:29 GMT
Access-Control-Allow-Origin: *
Access-Control-Allow-Methods: POST, GET, OPTIONS
Content-Type: text/html;charset=ISO-8859-1

然后谈话就停止了。理论上，浏览器应该在服务器响应正确的(?)时发出POST请求。CORS报头(Access-Control-Allow-Origin: *)

为了排除故障，我还发布了相同的$。从http://jquery.com发布命令。这就是我难住的地方，从jquery.com, post请求工作，OPTIONS请求被post发送。来自该事务的标题如下;

请求头- OPTIONS

Host: machineA:8081
User-Agent: ... Firefox/4.01
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
Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7
Keep-Alive: 115
Connection: keep-alive
Origin: http://jquery.com
Access-Control-Request-Method: POST

响应头- OPTIONS (STATUS = 200 OK)

Content-Length: 0
Access-Control-Allow-Headers: *
Access-Control-Max-Age: 1728000
Server: CherryPy/3.2.0
Date: Thu, 21 Apr 2011 22:37:59 GMT
Access-Control-Allow-Origin: *
Access-Control-Allow-Methods: POST, GET, OPTIONS
Content-Type: text/html;charset=ISO-8859-1

请求头- POST

Host: machineA:8081
User-Agent: ... Firefox/4.01
Accept: */*
Accept-Language: en-us,en;q=0.5
Accept-Encoding: gzip,deflate
Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7
Keep-Alive: 115
Connection: keep-alive
Content-Type: application/x-www-form-urlencoded; charset=UTF-8
Referer: http://jquery.com/
Content-Length: 12
Origin: http://jquery.com
Pragma: no-cache
Cache-Control: no-cache

响应头- POST (STATUS = 200 OK)

Content-Length: 32
Access-Control-Allow-Headers: *
Access-Control-Max-Age: 1728000
Server: CherryPy/3.2.0
Date: Thu, 21 Apr 2011 22:37:59 GMT
Access-Control-Allow-Origin: *
Access-Control-Allow-Methods: POST, GET, OPTIONS
Content-Type: application/json

我不明白为什么同样的请求在一个站点上可以工作，而在另一个站点上就不行。我希望有人能指出我错过了什么。谢谢你的帮助!

当前回答

这有点晚了，但我已经为此挣扎了好几天了。这是有可能的，我在这里找到的答案都不奏效。这看似简单。下面是.ajax调用:

<!DOCTYPE HTML> <html> <head> <body> <title>Javascript Test</title> <script src="http://code.jquery.com/jquery-latest.min.js"></script> <script type="text/javascript"> $(document).domain = 'XXX.com'; $(document).ready(function () { $.ajax({ xhrFields: {cors: false}, type: "GET", url: "http://XXXX.com/test.php?email='steve@XXX.com'", success: function (data) { alert(data); }, error: function (x, y, z) { alert(x.responseText + " :EEE: " + x.status); } }); }); </script> </body> </html>

下面是服务器端的php:

<html> <head> <title>PHP Test</title> </head> <body> <?php header('Origin: xxx.com'); header('Access-Control-Allow-Origin:*'); $servername = "sqlxxx"; $username = "xxxx"; $password = "sss"; $conn = new mysqli($servername, $username, $password); if ($conn->connect_error) { die( "Connection failed: " . $conn->connect_error); } $sql = "SELECT email, status, userdata FROM msi.usersLive"; $result = $conn->query($sql); if ($result->num_rows > 0) { while($row = $result->fetch_assoc()) { echo $row["email"] . ":" . $row["status"] . ":" . $row["userdata"] . "<br>"; } } else { echo "{ }"; } $conn->close(); ?> </body>

2016-11-03 04:29:28

其他回答

我最后偶然发现了这个链接“CORS POST请求可以用普通javascript实现，但为什么用jQuery不行?”，它指出jQuery 1.5.1添加了

 Access-Control-Request-Headers: x-requested-with

头到所有CORS请求。jQuery 1.5.2没有做到这一点。另外，根据同样的问题，设置服务器响应报头的

Access-Control-Allow-Headers: *

不允许响应继续。您需要确保响应标头明确地包含所需的标头。即:

Access-Control-Allow-Headers: x-requested-with

2011-04-22 07:33:08

结合Laravel解决了我的问题。只需将此头添加到您的jquery请求Access-Control-Request-Headers: x-requested-with，并确保您的服务器端响应具有此头设置Access-Control-Allow-Headers: *。

2014-04-13 02:58:24

以下是对我有用的方法的总结:

定义一个新函数(包装为$。简化Ajax):

jQuery.postCORS = function(url, data, func) {
  if(func == undefined) func = function(){};
  return $.ajax({
    type: 'POST', 
    url: url, 
    data: data, 
    dataType: 'json', 
    contentType: 'application/x-www-form-urlencoded', 
    xhrFields: { withCredentials: true }, 
    success: function(res) { func(res) }, 
    error: function() { 
            func({}) 
    }
  });
}

用法:

$.postCORS("https://example.com/service.json",{ x : 1 },function(obj){
      if(obj.ok) {
           ...
      }
});

也可以和.done，.fail等一起使用:

$.postCORS("https://example.com/service.json",{ x : 1 }).done(function(obj){
      if(obj.ok) {
           ...
      }
}).fail(function(){
    alert("Error!");
});

服务器端(在这个例子中，example.com是托管的)，设置这些头(添加了一些PHP示例代码):

header('Access-Control-Allow-Origin: https://not-example.com');
header('Access-Control-Allow-Credentials: true');
header('Access-Control-Max-Age: 604800');
header("Content-type: application/json");
$array = array("ok" => $_POST["x"]);
echo json_encode($array);

这是我所知道的从JS真正POST跨域的唯一方法。

JSONP将POST转换为GET，后者可能在服务器日志中显示敏感信息。

2016-08-05 07:17:54

要求:

 $.ajax({
            url: "http://localhost:8079/students/add/",
            type: "POST",
            crossDomain: true,
            data: JSON.stringify(somejson),
            dataType: "json",
            success: function (response) {
                var resp = JSON.parse(response)
                alert(resp.status);
            },
            error: function (xhr, status) {
                alert("error");
            }
        });

回应:

response = HttpResponse(json.dumps('{"status" : "success"}'))
response.__setitem__("Content-type", "application/json")
response.__setitem__("Access-Control-Allow-Origin", "*")

return response

2013-12-06 12:02:37

我花了些时间才找到答案。

如果你的服务器响应正确，请求是有问题的，你应该在请求的xhrFields中添加withCredentials: true:

$.ajax({
    url: url,
    type: method,
    // This is the important part
    xhrFields: {
        withCredentials: true
    },
    // This is the important part
    data: data,
    success: function (response) {
        // handle the response
    },
    error: function (xhr, status) {
        // handle errors
    }
});

注意:jQuery >= 1.5.1是必需的

2017-03-02 11:32:47

如何获得跨源资源共享(CORS)后请求工作

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