If you want to keep the 'href="/css/layout.css"' part, then yes, you can set up a rewrite rule. You just have to be careful not to redirect anything starting with /testsite (or you'll end up with a loop).
Like (in root .htaccess):
RewriteEngine On
RewriteCond %{REQUEST_URI} !^/testsite/.*$
RewriteRule ^(.*)$ /testsite/$1 [QSA,L]
There, you will be able to access your layout.css file either from:
Sure, all relative URIs (as yours) are relative to the base URI which by default is the URI of the document:
http://localhost/testsite/index.php
You only need to tell which part to add:
<link rel="stylesheet" type="text/css" href="./css/layout.css" />
^
` see this dot
Example:
Base URI :: http://localhost/testsite/index.php
Relative URI :: ./css/layout.css
Result :: http://localhost/testsite/css/layout.css
If you need to have this more modular, there are multiple ways to do that. One is to set the base URI explicitly inside the HTML document (see <base>).
Another one is to resolve links relatively on the server-side based on the Request URI and your site's root-path. See this answer for an example.
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如果您想保留 'href="/css/layout.css"' 部分，那么可以，您可以设置重写规则。您只需小心不要重定向以 /testsite 开头的任何内容（否则您将最终陷入循环）。
就像（在 root .htaccess 中）：
在那里，您将能够从以下位置访问您的 layout.css 文件：
http://localhost/ testsite/css/layout.css
或
http://localhost/css/layout.css
If you want to keep the 'href="/css/layout.css"' part, then yes, you can set up a rewrite rule. You just have to be careful not to redirect anything starting with /testsite (or you'll end up with a loop).
Like (in root .htaccess):
There, you will be able to access your layout.css file either from:
http://localhost/testsite/css/layout.css
or
http://localhost/css/layout.css
当然，所有相对 URI（如您的）都是相对于基本 URI 的，默认情况下，基本 URI 是文档的 URI：
您只需要告诉要添加哪一部分：
示例：
如果您需要更加模块化，有多种方法这样做。一种是在 HTML 文档中显式设置基本 URI（请参阅
另一种方法是根据请求 URI 和站点的根路径在服务器端相对解析链接。有关示例，请参阅此答案。
Sure, all relative URIs (as yours) are relative to the base URI which by default is the URI of the document:
You only need to tell which part to add:
Example:
If you need to have this more modular, there are multiple ways to do that. One is to set the base URI explicitly inside the HTML document (see
<base>).Another one is to resolve links relatively on the server-side based on the Request URI and your site's root-path. See this answer for an example.