【基础】Html跨域跳转问题整理

今天遇到一个问题，是有关 跨域跳转问题，涉及到知识比较基础。

具体问题是：

 A站点的 PageA (Post数据)到 B站点的 PageB，PageB接受到后Redirect到B站的 PageC； 那么，当前浏览器中的PageA页面 会被Redirect到PageC 吗？ 

 

测试了一下几种情况：

1.普通ajax:

类似以下这种ajax,答案是否定的

$(function(){
    $('#send').click(function(){
         $.ajax({
             type: "GET",
             url: "http://localhost:PageB/", 
             data: {username:$("#username").val(), content:$("#content").val()}, dataType: "json", success: function(data){ $('#resText').empty(); //清空resText里面的所有内容 var html = ''; $.each(data, function(commentIndex, comment){ html += '<div class="comment"><h6>' + comment['username'] + ':</h6><p class="para"' + comment['content'] + '</p></div>'; }); $('#resText').html(html); } }); }); });

2.通过Request模拟Post提交

类似以下这种后台模拟Request,答案是否定的

public  string HttpPost(string Url, string postDataStr, HttpForType hft) {

            SetAllowUnsafeHeaderParsing20(true);
            HttpWebRequest request = (HttpWebRequest)WebRequest.Create(Url);

            request.Method = "POST";
            request.ContentType = "application/x-www-form-urlencoded";
            request.CookieContainer = cookie; //cookie信息由CookieContainer自行维护

            var sss11 = GetAllCookies(cookie);

            request.UserAgent = "Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; Win64; x64; Trident/5.0)";
            Stream myRequestStream = request.GetRequestStream();
            StreamWriter myStreamWriter = new StreamWriter(myRequestStream, Encoding.GetEncoding("gb2312"));
            myStreamWriter.Write(postDataStr);
            myStreamWriter.Close();

            HttpWebResponse response = null;
            try {
                SetCertificatePolicy();
                response = (HttpWebResponse)request.GetResponse();
            } catch (System.Exception ex) {
                return ex.Message.ToString();
            }
            //获取重定向地址
            //string url1 = response.Headers["Location"];
            if (response != null) {
                var sss22 = GetAllCookies(cookie);

                Stream myResponseStream = response.GetResponseStream();
                StreamReader myStreamReader = new StreamReader(myResponseStream, Encoding.GetEncoding("utf-8"));
                string retString = myStreamReader.ReadToEnd();
                myStreamReader.Close();
                myResponseStream.Close();
 
                string retString = response.GetResponseHeader("Location");

                return retString;
            } else {
                return "error"; //post请求返回为空
            }
        }

3.拼凑form表单形式Post提交

类似以下这种ajax,答案是肯定的，可以直接从 A页面 跳转到C页面(调试发现：B页面跳转C页面是在B页面后台处理的，处理完返回302跳转码和新地址到浏览器，302的新地址,header的location属性值就是C页面地址)

或者在A页面插入类似以下表单形式，答案也是可以跳转到C页面:

 <form action="http://localhost:PageB/" method="post">
        <input id="name" name="name" value="123"/>

以上是讨论的Post跨域跳转问题。