<%@ WebHandler Language="C#" Class="SaveArchive" %>
using System;
using System.IO;
using System.Net;
using System.Text;
using System.Web;

public class SaveArchive : IHttpHandler
{
    public bool IsReusable { get { return true; } }
    public void ProcessRequest(HttpContext context)
    {
        context.Response.ContentType = "application/json";
        try
        {
            string body;
            using (var reader = new StreamReader(context.Request.InputStream, Encoding.UTF8)) body = reader.ReadToEnd();
            var url = ResolveNodeUrl();
            var req = (HttpWebRequest)WebRequest.Create(url);
            req.Method = "POST";
            req.ContentType = "application/json";
            var data = Encoding.UTF8.GetBytes(body);
            using (var s = req.GetRequestStream()) s.Write(data, 0, data.Length);
            using (var resp = (HttpWebResponse)req.GetResponse())
            using (var rs = resp.GetResponseStream())
            using (var r = new StreamReader(rs, Encoding.UTF8))
            {
                var txt = r.ReadToEnd();
                context.Response.Write(txt);
            }
        }
        catch (Exception e)
        {
            context.Response.StatusCode = 500;
            var msg = "{\"ok\":false,\"error\":\"" + Escape(e.Message) + "\"}";
            context.Response.Write(msg);
        }
    }
    string ResolveNodeUrl()
    {
        var ports = new int[] { 8976, 5050 };
        foreach (var p in ports)
        {
            var u = "http://localhost:" + p + "/api/archives/save";
            if (Probe(u)) return u;
        }
        return "http://localhost:5050/api/archives/save";
    }
    bool Probe(string url)
    {
        try
        {
            var req = (HttpWebRequest)WebRequest.Create(url.Replace("/api/archives/save", "/api/ping"));
            req.Method = "GET";
            req.Timeout = 1500;
            using (var resp = (HttpWebResponse)req.GetResponse()) return resp.StatusCode == HttpStatusCode.OK;
        }
        catch { return false; }
    }
    string Escape(string s)
    {
        return s.Replace("\\", "\\\\").Replace("\"", "\\\"");
    }
}