使用基本标记时的相对URL斜杠 [英] Relative URL slash when using base tag
问题描述
当将HTML基本标记与相对URL组合使用时，它是否可以使用？漂亮的标准，以斜线结束基础href？
我问的原因是因为我经常需要用JSP内的上下文根（例如表单动作）来表达事物，以便表单被路由到适当的servlet，因为我已经在web.xml中映射了它。
大部分时间我会每次都使用 $ {pageContext.request.contextPath} ，直到我学会了关于基本标签。然而，我猜测，由于在JSP中，斜杠被服务器解释为Web应用程序的根，所以我不能拥有我的基础，例如：
< base href =/ foo/>
然后在表单中有：
< form action =/ extension>
...
< / form>
由于这会导致表单被提交到 mydomain.com/extension 而不是 mydomain.com/foo/extension 。我是否正确理解这一点，既然斜线有特殊含义，您通常需要用反斜杠结束基础HREF以获得所需效果？
谢谢
浏览器不会简单地连接您的基 href 属性和相对URL。
相反，< base> 标签设置文档基址，然后用于动态生成新路径。
您可以在WHATWG HTML规范中看到一个有趣的例子：
< base href =http://www.example.com/news/index.html>
< p>访问< a href =archives.html>存档< / a>。< / p>
请注意， href 属性甚至以一个文件名。
这意味着如果你没有在你的基础 href 属性上加一个斜线， foo 将被视为路径的最后一个易变部分，并且将基本上被删除。举例来说：
< base href =http://www.example.com/news/index.html />
< img src =ball.png/> <！ - GET http://www.example.com/news/ball.png - >
< ; base href =http://www.example.com/news//>
< img src =ball.png/> <！ - GET http://www.example.com/news/ball.png - >
< ; base href =http://www.example.com/news/>
< img src =ball.png/> <！ - GET http://www.example.com/ball.png - >
< ; base href =http://www.example.com//>
< img src =ball.png/> <！ - GET http://www.example.com/ball.png - >
< ; - 如果从http://www.example.com提供服务： - >
< base href =//>
< img src =ball.png/> <！ - GET http://www.example.com/ball.png - >
I'm trying to learn more about the way paths are interpreted with a JSP.
When using an HTML base tag in combination with a relative URL, is it pretty standard to end the base href with a slash?
The reason I am asking is because I often need to express things in terms of the context root within a JSP (for a form action for example), so that the form is routed to the appropriate servlet as I've mapped it in web.xml.
Most of the time I would just use ${pageContext.request.contextPath} every time, until I learned about the base tag.
However, I'm guessing that since in a JSP the slash is interpreted by the server as the root of the web application, I can't have my base be, for example:
<base href="/foo"/>
and then in the form have:
<form action="/extension">
...
</form>
Since this would cause the form to be submitted to mydomain.com/extension instead of mydomain.com/foo/extension. Am I understanding this correctly, that since slash has special meaning, you generally need to end the base HREF with a backslash to get the desired effect?
Thanks
Not really.
Browsers do not simply concatenate your base href attributes and relative URLs.
Instead, <base> tag sets the Document base URL which is then used to dynamically generate a new path.
You can see an interesting example in the WHATWG HTML specification:
<base href="http://www.example.com/news/index.html">
<p>Visit the <a href="archives.html">archives</a>.</p>
Note that the href attribute even ends with a filename.
This means that if you do not put a trailing slash to your base href attribute, foo will be treated as the last, volatile part of the path and will essentially be removed. By way of example:
<base href="http://www.example.com/news/index.html" />
<img src="ball.png" /> <!-- GET http://www.example.com/news/ball.png -->
<base href="http://www.example.com/news/" />
<img src="ball.png" /> <!-- GET http://www.example.com/news/ball.png -->
<base href="http://www.example.com/news" />
<img src="ball.png" /> <!-- GET http://www.example.com/ball.png -->
<base href="http://www.example.com/" />
<img src="ball.png" /> <!-- GET http://www.example.com/ball.png -->
<!-- If served from http://www.example.com: -->
<base href="/" />
<img src="ball.png" /> <!-- GET http://www.example.com/ball.png -->
这篇关于使用基本标记时的相对URL斜杠的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
