In my case, same error was coming with JSP. This is how I got to the root of this issue: I went to the Network tab and clearly saw that the browser request to fetch the css was returning response header having "Content-type" : "text/html". I opened another tab and manually hit the request to fetch the css. It ended up returning a html log in form. Turns out that my web application had a url mapping for path = / Tomcat servlet entry : (@WebServlet({ "/, /index", }). So, any unmatching request URLs were somehow being matched to / and the corresponding servlet was returning a Log in html form. I fixed it by removing the mapping to /

此外，tomcat配置wrt处理css MIME-TYPE已经存在。

我在MVC4中使用表单身份验证时遇到了类似的问题。问题出在web。config中的这一行，

<modules runAllManagedModulesForAllRequests="true">

这意味着每个请求，包括静态内容的请求，都要经过身份验证。

将这一行更改为:

<modules runAllManagedModulesForAllRequests="false">

使用ReactJs，当我添加样式文件到index.html使用相对链接，如

<link rel="stylesheet" href="./css/style.css"> .

然后我导航到一条路线，说;localhost:3000/artist和刷新，我得到错误。

错误消失后，我取代相对链接与绝对链接说;

<link rel=“stylesheet” href=“http://localhost/project/public/css/style.css”。

以防有人来到这个帖子，有类似的问题。我也遇到过类似的问题，但是解决方法很简单。

一名开发人员错误地丢失了一份网页副本。将config文件放到CSS目录下。删除后，所有错误都得到解决，页面正常显示。

有同样的错误，因为我忘记发送一个正确的头

header("Content-type: text/css; charset: UTF-8");
print 'body { text-align: justify; font-size: 2em; }';

如果你使用nginx提供静态css，你应该添加

location ~ \.css {
    add_header  Content-Type    text/css;
}
location ~ \.js {
    add_header  Content-Type    application/x-javascript;
}

or

location ~ \.css{
    default_type text/css;
}
location ~ \.js{
    default_type application/x-javascript;
}

到nginx conf