302,303,307

Question

假设我现在正在发表一个表格：

<form id="post-form" class="post-form" 
      action="/questions/ask/submit" method="post">

您会注意到action中没有网站，浏览器会跟随其获取网页的位置。

发布时，浏览器会遵循当前的域规则

If the current page is...                then the browser will POST to
=======================================  =============
http://stackoverflow.com/questions/ask   http://stackoverflow.com/questions/ask/submit
https://stackoverflow.com/questions/ask  https://stackoverflow.com/questions/ask/submit

但我想确保浏览器始终转到安全页面：

http://stackoverflow.com/questions/ask   https://stackoverflow.com/questions/ask/submit

通常你会尝试这样的事情：

<form id="post-form" class="post-form" 
      action="https://stackoverflow.com/questions/ask/submit" method="post">

除了需要知道托管网站的域名和虚拟路径名称（例如stackoverflow.com）。如果网站被更改：

stackoverflow.net
stackoverflow.com/mobile
de.stackoverflow.com
stackoverflow.co.uk/fr
beta.stackoverflow.com

然后表格action也必须更新：

<form id="post-form" class="post-form" action="https://stackoverflow.net/questions/ask/submit" method="post">

<form id="post-form" class="post-form" action="https://stackoverflow.com/mobile/questions/ask/submit" method="post">

<form id="post-form" class="post-form" action="https://de.stackoverflow.com/questions/ask/submit" method="post">

<form id="post-form" class="post-form" action="https://stackoverflow.co.uk/fr/questions/ask/submit" method="post">

<form id="post-form" class="post-form" action="https://beta.stackoverflow.com/questions/ask/submit" method="post">

如何指示浏览器转到页面的https版本？

假设语法：

<form id="post-form" class="post-form" action="https://./questions/ask/submit" method="post">

302,303,307

最初302 Found是告诉用户代理去其他地方的代码。目的是浏览器只需在新位置再试一次：

POST /questions/ask/submit

302 Found
Location: /submitquestion

POST /submitquestion

不幸的是，所有浏览器都错了，并且错误地总是在新位置使用GET：

POST /questions/ask/submit

302 Found
Location: /submitquestion

GET /submitquestion

由于浏览器出错了，因此创建了两个新代码：

302 Found ：（旧版已弃用）在新位置再次尝试完全相同的内容;但是旧版浏览器正在切换到GET
303 See Other ：忘记用户正在做的事情，然后在此位置上执行GET
307 Temporary Redirect：在新的位置再次尝试完全相同的事情（不，严重的，同样的事情 - 我没有说你可以切换到GET。如果您正在执行DELETE，请转到此处DELETE。）

例如，如果用户代理位于POST：

的中间

| Response               | What agent should do  | What many agents actually do |
|------------------------|-----------------------|------------------------------|
| 302 Found              | POST to new Location  | GET from new Location        |
| 303 See Other          | GET from new Location | GET from new Location        |
| 307 Temporary Redirect | POST to new Location  | POST to new Location         |

理想情况下，有一种方法可以使用307 Temporary Redirect告诉用户代理在安全网址上再次尝试POST：

POST /questions/ask/submit

307 Temporary Redirect
Location: https://beta.stackoverflow.com/questions/ask/submit

POST /questions/ask/submit

我可以在ASP.net中使用足够好的服务器端：

if (!Request.IsSecureConnection)
{
   string redirectUrl = Request.Url.ToString().Replace("http:", "https:");
   Response.Redirect(redirectUrl);

   //We don't want to send the client the deprecated 302 code, we want to use 307 telling them that we really want them to continue the POST, PUT, DELETE, etc
   Response.StatusCode = (int)System.Net.HttpStatusCode.TemporaryRedirect;     
   Response.End();
}

但我不知道你是否可以在Location中指定一个完整的uri。

Answer 1

您可以使用javascript更改表单的操作：

var form = document.getElementById("post-form");
form.action = location.href.replace(/^http:/, 'https:');

但是有一些security considerations，我建议你将表单的网址重定向到https。虽然你可以从javascript中做到这一点，但是当它获得安全性时你永远不应该信任javascript，所以从服务器做它（它也更快，页面不必加载，只有http头）

Answer 2

您最好确保如果用户登陆到您的http页面，则将其重定向到等效的https。在您的：

<script>
if ((window.location.href.substring(0, 8) != "https://") {
  window.location = location.href.replace(/^http:/, 'https:');
}
</script>

如何POST到HTTP？

302,303,307

2 个答案: