您的代码没有意义.在第一个路由中，您告诉Express响应302重定向并发送一些数据. 它将向您的客户端发送JSON ，这是您得到正确的Content-Length的事实.

Your code doesn't make sense. In the first route, you tell Express to respond with a 302 redirect and send some data. It is sending your JSON to the client, something you can see in the fact that you're getting a correct Content-Length.

但是，您的第二条路线无效.首先，GET请求不能具有正文； req.body总是 为空.

However, your second route can't work. Firstly, GET requests cannot have a body; req.body will always be empty.

第二，看起来您假设接收到重定向的客户端将向其目标(在这种情况下为 example.com/sending )向其请求中重新提交重定向响应的实体主体. .这是不正确的.

Secondly, it looks like you're assuming a client receiving a redirect will resubmit the entity-body of the redirect response in its request to the target (example.com/sending in this case). This is incorrect.

• 符合规范的HTTP客户端绝不会将服务器的响应作为另一个请求的主体发送.
• HTTP客户端传统上将302视为303，这意味着对目标URL的请求始终是GET请求，即使原始请求是POST.因此，重定向的请求不可能包含任何类型的主体.

• A spec-compliant HTTP client will never send a server's response as the body of another request.
• HTTP clients traditionally treat a 302 like a 303, meaning that the request to the target URL is always a GET request, even if the original request was a POST. Thus, it is impossible for the redirected request to contain any kind of body.

如果要将某种数据发送到另一台服务器，则有两个选择:

If you want to send some kind of data to another server, you have two options:

• 使用303重定向在查询字符串上发送数据.

• Send the data on the query string with a 303 redirect.

// I'll use the built-in querystring module to convert an object into
// a properly URL-encoded query string.
res.redirect(303, '/url?' + querystring.stringify(data));

res.send('<form id="redir" method="post" action="/url">' +
         '<input type="hidden" name="foo" value="bar">' +
         // ...
         '</form>' +
         '<script>document.getElementById("redir").submit()</script>');