为什么 HttpServletRequest 在 # 字符上截断 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 #，那么字符串将被截断！

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

`localhost:8080/hash/asdfgh#jkl`

问题：如何原生传递入参？

Answer 1

从 # 开始的部分不会发送 to/received 到您的 servlet。
这是仅从客户端（浏览器）使用的信息，不会 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.

为什么 HttpServletRequest 在 # 字符上截断 url 输入？

Why HttpServletRequest truncates url input on a # character?

java

spring

servlets

spring-web