在尝试了其他解决方案后，仍然没有奏效，我发现了我的问题所在。我把contentType从“application/json”改为“text/plain”。

$.ajax(fullUrl, {
    type: "GET",
    contentType: "text/plain",
    xhrFields: {
         withCredentials: true
    },
    crossDomain: true
});

AJAX调用仅在您调用的url与调用脚本在同一域中时发送cookie。

这可能是一个跨域问题。

也许你试图从www.domain-a.com调用一个url，而你的调用脚本在www.domain-b.com上(换句话说:你进行了跨域调用，在这种情况下浏览器不会发送任何cookie来保护你的隐私)。

在这种情况下，你的选择是:

Write a small proxy which resides on domain-b and forwards your requests to domain-a. Your browser will allow you to call the proxy because it's on the same server as the calling script.This proxy then can be configured by you to accept a cookie name and value parameter which it can send to domain-a. But for this to work you need to know the cookie's name and value your server on domain-a wants for authentication. If you're fetching JSON objects try to use a JSONP request instead. jQuery supports these. But you need to alter your service on domain-a so that it returns valid JSONP responds.

如果这能帮到你就好了。

如果您正在localhost或localhost上的端口(如localhost:8080)上进行开发，除了上面回答中描述的步骤外，还需要确保您没有在Set-Cookie报头中传递域值。 您不能在set - cookie报头中将域设置为localhost -这是不正确的-只需省略域即可。

查看cookie在本地主机与显式域和为什么asp.net不会在本地主机创建cookie ?

我在跨域场景下操作。在登录期间，远程服务器返回set - cookie报头，并将Access-Control-Allow-Credentials设置为true。

下一次对远程服务器的ajax调用应该使用这个cookie。

CORS的Access-Control-Allow-Credentials允许跨域日志记录。查看https://developer.mozilla.org/En/HTTP_access_control获取示例。

对我来说，这似乎是JQuery的一个bug(或者至少是下一个版本的新特性)。

更新:

cookie不会从AJAX响应中自动设置(引用:http://aleembawany.com/2006/11/14/anatomy-of-a-well-designed-ajax-login-experience/) 为什么? 您无法从响应中获取cookie的值以手动设置(http://www.w3.org/TR/XMLHttpRequest/#dom-xmlhttprequest-getresponseheader) 我困惑. . 应该有一种方法可以让jquery.ajax()设置XMLHttpRequest。withCredentials = "true"参数。

答: 您应该使用http://api.jquery.com/jQuery.ajax/的xhrFields参数

文档中的示例如下:

$.ajax({
   url: a_cross_domain_url,
   xhrFields: {
      withCredentials: true
   }
});

服务器正确地响应这个请求也很重要。这里复制来自@Frédéric和@Pebbl的精彩评论:

重要提示:当响应一个已验证的请求时，服务器必须指定一个域，并且不能使用通配符。如果头部是通配符，上面的例子将失败:Access-Control-Allow-Origin: *

所以当请求是:

Origin: http://foo.example
Cookie: pageAccess=2

服务器应响应:

Access-Control-Allow-Origin: http://foo.example
Access-Control-Allow-Credentials: true

[payload]

否则有效负载将不会返回到脚本。见:https://developer.mozilla.org/en-US/docs/Web/HTTP/Access_control_CORS Requests_with_credentials

当您试图发送跨站点请求时发生此错误。 我怎么解决这个问题?

在nginx配置文件中添加

add_header Access-Control-Allow-Origin '*.domain.com'
add_header Access-Control-Allow-Credentials 'true';

在“domain.com”中，我试图发送ajax请求

$.ajax({
   url: sub.domain.com,
   xhrFields: {
      withCredentials: true
   }
});

There are already a lot of good responses to this question, but I thought it may be helpful to clarify the case where you would expect the session cookie to be sent because the cookie domain matches, but it is not getting sent because the AJAX request is being made to a different subdomain. In this case, I have a cookie that is assigned to the *.mydomain.com domain, and I am wanting it to be included in an AJAX request to different.mydomain.com". By default, the cookie does not get sent. You do not need to disable HTTPONLY on the session cookie to resolve this issue. You only need to do what wombling suggested (https://stackoverflow.com/a/23660618/545223) and do the following.

1)在ajax请求中添加以下内容。

xhrFields: { withCredentials:true }

2)在不同子域的资源的响应头中添加以下内容。

Access-Control-Allow-Origin : http://original.mydomain.com
Access-Control-Allow-Credentials : true