17168ERP/web/App_Code/api/FilesController.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Net.Http;
using System.Web.Http;
using System.IO;
using System.Web;
//using System.Web.Helpers;
using System.Web.Hosting;
using System.Net.Http.Headers;
using System.Threading.Tasks;
//using System.Web.Mvc;


[Route("files")]
public class FilesController : ApiController
{
    // GET api/<controller>
    public IEnumerable<string> Get()
    {
        return new string[] { "value1", "value2" };
    }

    [Route("upload/{*url}")]
    public async Task<HttpResponseMessage> get_upload(string url)
    {
        // 改用標準路徑（原本使用 Sites 多站點功能，目前已停用）
        var path = HttpContext.Current.Server.MapPath($"~/upload/{url}");
        if (!System.IO.File.Exists(path))
        {
            throw new HttpResponseException(HttpStatusCode.NotFound);
        }
        string mimeType = MimeMapping.GetMimeMapping(path);

        HttpResponseMessage response = new HttpResponseMessage();
        response.Content = new StreamContent(new FileStream(path, FileMode.Open));
        response.Content.Headers.ContentType = new MediaTypeHeaderValue(mimeType);
        response.Headers.CacheControl = new CacheControlHeaderValue()
        {
            Public = true,
            MaxAge = TimeSpan.FromSeconds(Sites.MaxAge)  // MaxAge 常數仍可使用
        }; 

        return response;
    }
    [Route("public/{*url}")]
    public string get_public (string url)
    {
        return "public:" + url;
    }

    // POST api/<controller>
    public void Post([FromBody] string value)
    {
    }

    // PUT api/<controller>/5
    public void Put(int id, [FromBody] string value)
    {
    }

    // DELETE api/<controller>/5
    public void Delete(int id)
    {
    }
}