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。

我有同样的问题，做一些检查我的脚本只是没有得到sessionid cookie。

通过查看浏览器中的sessionid cookie值，我发现我的框架(Django)将sessionid cookie以HttpOnly作为默认值传递。这意味着脚本不能访问sessionid值，因此不能将它与请求一起传递。有点荒谬的是，HttpOnly将是默认值，而很多东西都使用Ajax，这将需要访问限制。

为了解决这个问题，我改变了一个设置(SESSION_COOKIE_HTTPONLY=False)，但在其他情况下，它可能是cookie路径上的“HttpOnly”标志

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。

加上我的设想和解决方案，说不定能帮助到别人。我在使用RESTful api时遇到过类似的情况。我的承载HTML/Script/CSS文件的Web服务器和公开api的Application server托管在同一个域中。 然而，道路是不同的。

Web服务器- mydomain/webpages/abc.html

使用abc.js将cookie设置为mycookie

应用服务器- mydomain/webapis/servicename。

对哪个API调用

我期待在我的域名/webapis/servicename的cookie，并尝试读取它，但它没有被发送。 在阅读评论从答案，我检查在浏览器的开发工具 Mycookie的路径被设置为“/webpages”，因此在服务调用中不可用

mydomain webapis / xml数据

所以当设置cookie从jquery，这是我所做的-

$.cookie("mycookie","mayvalue",{**path:'/'**});

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
});

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