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

Question

下面的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#，则字符串被截断

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

`localhost:8080/hash/asdfgh#jkl`

问题：我如何以本机方式传递输入参数

Answer 1

从#开始的部分不会发送到servlet或被servlet接收
这是一种仅从客户端（浏览器）使用的信息，不会产生任何影响 URI的一部分

该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.