JavaScript-why are cookies available under a two-level domain name, but not automatically sent back using Ajax, cookies cannot cross domains?

Scenario Recurrence Process:

机器A局域网地址：192.168.9.8机器B局域网地址：192.168.9.9

分别配置机器A、B的hosts地址：配置机器A的地址：192.168.9.8 --> a.site.com 配置机器B的地址：192.168.9.9 --> b.site.com

Machine A is the front-end JS code, starts the service, and requests machine B on the browser (on behalf of the server side)
The first address of the http://b.site.com:8080/login/..., the request of the server side injected a cookie,
The key for setting the cookie is ' site ', value is ' date ', Doman is. site.com, path is/
, then open a new page on the browser and request Http://a.site.com:8080/index on the new page, which you can see through the chrome console
http://b.site.com:8080/
injected cookies, but ..... Through the Ajax interface, the cookie does not appear in the request header, tried a variety of ways, get, post, asynchronous, synchronization is not. Finally, using the Jsonp method, the cookie appears

The bad code is as follows:

$("a").click(function(event) {        $.ajax({            url: 'http://b.site.com:8080/test/test.htm',            type: 'post',            dataType: 'json',            data: {'token': 'value'},        })        .done(function() {            console.log("success");        })        .fail(function() {            console.log("error");        })        .always(function() {            console.log("complete");        });});

The useful code is as follows:

function flightHandler(data) {    console.log(data);    // body...};$("a").click(function(event) {    $.ajax({         type: "get",         url: "http://b.site.com:8080/test/test.htm",         dataType: "jsonp",         jsonp: "callback",//传递给请求处理程序或页面的，用以获得jsonp回调函数名的参数名(一般默认为:callback)         jsonpCallback:"flightHandler",//自定义的jsonp回调函数名称，默认为jQuery自动生成的随机函数名，也可以写"?"，jQuery会自动为你处理数据         success: function(data){            console.log(data);         },         error: function(){             alert('fail');         }     });});

Please help the gods to see, if you can doubt, thank you very much

Reply content:

Scenario Recurrence Process:

机器A局域网地址：192.168.9.8机器B局域网地址：192.168.9.9

分别配置机器A、B的hosts地址：配置机器A的地址：192.168.9.8 --> a.site.com 配置机器B的地址：192.168.9.9 --> b.site.com

Machine A is the front-end JS code, starts the service, and requests machine B on the browser (on behalf of the server side)
The first address of the http://b.site.com:8080/login/..., the request of the server side injected a cookie,
The key for setting the cookie is ' site ', value is ' date ', Doman is. site.com, path is/
, then open a new page on the browser and request Http://a.site.com:8080/index on the new page, which you can see through the chrome console
http://b.site.com:8080/
injected cookies, but ..... Through the Ajax interface, the cookie does not appear in the request header, tried a variety of ways, get, post, asynchronous, synchronization is not. Finally, using the Jsonp method, the cookie appears

The bad code is as follows:

$("a").click(function(event) {        $.ajax({            url: 'http://b.site.com:8080/test/test.htm',            type: 'post',            dataType: 'json',            data: {'token': 'value'},        })        .done(function() {            console.log("success");        })        .fail(function() {            console.log("error");        })        .always(function() {            console.log("complete");        });});

The useful code is as follows:

function flightHandler(data) {    console.log(data);    // body...};$("a").click(function(event) {    $.ajax({         type: "get",         url: "http://b.site.com:8080/test/test.htm",         dataType: "jsonp",         jsonp: "callback",//传递给请求处理程序或页面的，用以获得jsonp回调函数名的参数名(一般默认为:callback)         jsonpCallback:"flightHandler",//自定义的jsonp回调函数名称，默认为jQuery自动生成的随机函数名，也可以写"?"，jQuery会自动为你处理数据         success: function(data){            console.log(data);         },         error: function(){             alert('fail');         }     });});

Please help the gods to see, if you can doubt, thank you very much

Withcredentials=true, and ensure that the service side allows cross-domain, specifically refer to Cors

Domain is not what you say or what it is. Cookie domain and Ajax domain are not the same thing

