我想返回<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-beta.2/css/bootstrap.min.css" integrity="sha384-PsH8R72JQ3SOdhVi3uxftmaW6Vc51MKb0q5P2rRUpPvrszuE4W1povHYgTpBfshb" crossorigin="anonymous">
<script src="https://code.jquery.com/jquery-3.2.1.slim.min.js" integrity="sha384-KJ3o2DKtIkvYIK3UENzmM7KCkRr/rE9/Qpg6aAZGJwFDMVNA/GpGFF93hXpG5KkN" crossorigin="anonymous"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.12.3/umd/popper.min.js" integrity="sha384-vFJXuSJphROIrBnz7yo7oB41mKfc8JzQZiCq4NCceLEaO4IHwicKwpJf9c9IpFgh" crossorigin="anonymous"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-beta.2/js/bootstrap.min.js" integrity="sha384-alpBpkh1PFOepccYVYDB4do5UnbKysX5WZXm3XxPqe5iKTfUKjNkCk9SaVuEZflJ" crossorigin="anonymous"></script>
<script src="https://cdn.steemjs.com/lib/latest/steem.min.js"></script>
</head>
<body>
<div class="container">
<div class="card-deck">
<div class="card mb-4">
<img class="card-img-top img-fluid" src="//placehold.it/500x280" alt="Card image cap">
<div class="card-body">
<h4 class="card-title">1 Card title</h4>
<p class="card-text">This is a longer card with supporting text below as a natural lead-in to additional content. This content is a little bit longer.</p>
<p class="card-text"><small class="text-muted">Last updated 3 mins ago</small></p>
</div>
</div>
<div class="card mb-4">
<img class="card-img-top img-fluid" src="//placehold.it/500x280" alt="Card image cap">
<div class="card-body">
<h4 class="card-title">2 Card title</h4>
<p class="card-text">This is a longer card with supporting text below as a natural lead-in to additional content. This content is a little bit longer.</p>
<p class="card-text"><small class="text-muted">Last updated 3 mins ago</small></p>
</div>
</div>
<div class="w-100 d-none d-sm-block d-md-none"><!-- wrap every 2 on sm--></div>
<div class="card mb-4">
<img class="card-img-top img-fluid" src="//placehold.it/500x280" alt="Card image cap">
<div class="card-body">
<h4 class="card-title">3 Card title</h4>
<p class="card-text">This is a longer card with supporting text below as a natural lead-in to additional content. This content is a little bit longer.</p>
<p class="card-text"><small class="text-muted">Last updated 3 mins ago</small></p>
</div>
</div>
<div class="w-100 d-none d-md-block d-lg-none"><!-- wrap every 3 on md--></div>
<div class="card mb-4">
<img class="card-img-top img-fluid" src="//placehold.it/500x280" alt="Card image cap">
<div class="card-body">
<h4 class="card-title">4 Card title</h4>
<p class="card-text">This is a longer card with supporting text below as a natural lead-in to additional content. This content is a little bit longer.</p>
<p class="card-text"><small class="text-muted">Last updated 3 mins ago</small></p>
</div>
</div>
<div class="w-100 d-none d-sm-block d-md-none"><!-- wrap every 2 on sm--></div>
<div class="w-100 d-none d-lg-block d-xl-none"><!-- wrap every 4 on lg--></div>
<div class="card mb-4">
<img class="card-img-top img-fluid" src="//placehold.it/500x280" alt="Card image cap">
<div class="card-body">
<h4 class="card-title">5 Card title</h4>
<p class="card-text">This is a longer card with supporting text below as a natural lead-in to additional content. This content is a little bit longer.</p>
<p class="card-text"><small class="text-muted">Last updated 3 mins ago</small></p>
</div>
</div>
<div class="w-100 d-none d-xl-block"><!-- wrap every 5 on xl--></div>
<div class="card mb-4">
<img class="card-img-top img-fluid" src="//placehold.it/500x300" alt="Card image cap">
<div class="card-body">
<h4 class="card-title">6 Card title</h4>
<p class="card-text">This card has supporting text below as a natural lead-in to additional content.</p>
<p class="card-text"><small class="text-muted">Last updated 3 mins ago</small></p>
</div>
</div>
<div class="w-100 d-none d-sm-block d-md-none"><!-- wrap every 2 on sm--></div>
<div class="w-100 d-none d-md-block d-lg-none"><!-- wrap every 3 on md--></div>
<div class="card mb-4">
<img class="card-img-top img-fluid" src="//placehold.it/500x270" alt="Card image cap">
<div class="card-body">
<h4 class="card-title">7 Card title</h4>
<p class="card-text">This is a wider card with supporting text below as a natural lead-in to additional content. This card has even longer content than the first to show that equal height action.</p>
<p class="card-text"><small class="text-muted">Last updated 3 mins ago</small></p>
</div>
</div>
<div class="card mb-4">
<img class="card-img-top img-fluid" src="//placehold.it/500x300" alt="Card image cap">
<div class="card-body">
<h4 class="card-title">8 Card title</h4>
<p class="card-text">This card has supporting text below as a natural lead-in to additional content.</p>
<p class="card-text"><small class="text-muted">Last updated 3 mins ago</small></p>
</div>
</div>
<div class="w-100 d-none d-sm-block d-md-none"><!-- wrap every 2 on sm--></div>
<div class="w-100 d-none d-lg-block d-xl-none"><!-- wrap every 4 on lg--></div>
<div class="card mb-4">
<img class="card-img-top img-fluid" src="//placehold.it/500x270" alt="Card image cap">
<div class="card-body">
<h4 class="card-title">Card title</h4>
<p class="card-text">This is a wider card with supporting text below as a natural lead-in to additional content. This card has even longer content than the first to show that equal height action.</p>
<p class="card-text"><small class="text-muted">Last updated 3 mins ago</small></p>
</div>
</div>
<div class="w-100 d-none d-md-block d-lg-none"><!-- wrap every 3 on md--></div>
<div class="card mb-4">
<img class="card-img-top img-fluid" src="//placehold.it/500x270" alt="Card image cap">
<div class="card-body">
<h4 class="card-title">10 Card title</h4>
<p class="card-text">This is a wider card with supporting text below as a natural lead-in to additional content. This card has even longer content than the first to show that equal height action.</p>
<p class="card-text"><small class="text-muted">Last updated 3 mins ago</small></p>
</div>
</div>
</div>
</div>
</body> http状态代码。虽然我想添加一个自定义错误消息，提供详细信息为什么哪里没有内容。
问题：我使用204 no content，并且在返回spring-mvc类型时，响应正文始终被移除并为客户端清空！
HttpStatus.NO_CONTENT如果我将类型更改为@RestControllerAdvice
public class ExeptionHandler {
@ExceptionHandler(Exception.class)
@ResponseStatus(HttpStatus.NO_CONTENT)
public Object handler(HttpServletRequest req, Exception e) {
return new ResponseEntity<String>(e.getMessage(), HttpStatus.NO_CONTENT);
}
}
，则错误消息将显示为响应正文。
如何用204实现相同的目标？
答案 0 :(得分：4)
我想返回一个
204无内容的HTTP状态代码。虽然我想添加一个自定义错误消息，但会详细说明为何没有内容。
你不能。
问题：我使用的是Spring MVC，当返回
HttpStatus.NO_CONTENT类型时，响应主体总是被移除并为客户端清空！
这是预期的行为。
如果我将类型更改为
HttpStatus.NOT_FOUND，则错误消息将显示为响应正文。我怎么能用204实现同样的目标呢？
您无法通过204实现目标。您误解（并且可能滥用）此类状态代码。 204的目的是表明服务器已成功完成请求，并且不会在响应有效内容中发送其他内容。
了解如何在RFC 7231：
中定义此状态代码
204（无内容）状态代码表示服务器具有 成功完成了请求，并且没有其他要求 要在响应有效负载主体中发送的内容。 [...]
204响应由标头后的第一个空行终止 字段，因为它不能包含邮件正文。 [...]
答案 1 :(得分：1)
204表示成功请求。它应该没有包含错误消息。
如果发生错误，则应使用其他HTTP代码。
请参阅https://httpstatuses.com/204
204响应由标题字段后面的第一个空行终止，因为它不能包含邮件正文。