java - 为什么 HttpServletRequest 会截断 # 字符上的 url 输入？

Question

以下 servlet 读取 url 路径参数。问题:如果输入包含特殊字符，例如我发现#，那么字符串会被截断!

@RestController
public class MyServlet {    
    @GetMapping("/hash")
    @ApiIgnore
    public String hash(HttpServletRequest req) {
        String pw = req.getPathInfo(); //asdfgh
    }
}

`localhost:8080/hash/asdfgh#jkl`

问题:如何原生传递输入参数？

Answer 1

从 # 开始的部分不会发送到您的 servlet，也不会被您的 servlet 接收。
这是仅从客户端(浏览器)使用的信息，不会使URI 的一部分。

RFC2396确实指出:

When a URI reference is used to perform a retrieval action on the identified resource, the optional fragment identifier, separated from the URI by a crosshatch ("#") character, consists of additional reference information to be interpreted by the user agent after the retrieval action has been successfully completed. As such, it is not part of a URI, but is often used in conjunction with a URI.