.NET Framework HTTP servers Basic read-only HTTP file server (HttpListener)
Example
Notes:
This example must be run in administrative mode.
Only one simultaneous client is supported.
For simplicity, filenames are assumed to be all ASCII (for the filename part in the Content-Disposition header) and file access errors are not handled.
using System;
using System.IO;
using System.Net;
class HttpFileServer
{
private static HttpListenerResponse response;
private static HttpListener listener;
private static string baseFilesystemPath;
static void Main(string[] args)
{
if (!HttpListener.IsSupported)
{
Console.WriteLine(
"*** HttpListener requires at least Windows XP SP2 or Windows Server 2003.");
return;
}
if(args.Length < 2)
{
Console.WriteLine("Basic read-only HTTP file server");
Console.WriteLine();
Console.WriteLine("Usage: httpfileserver <base filesystem path> <port>");
Console.WriteLine("Request format: http://url:port/path/to/file.ext");
return;
}
baseFilesystemPath = Path.GetFullPath(args[0]);
var port = int.Parse(args[1]);
listener = new HttpListener();
listener.Prefixes.Add("http://*:" + port + "/");
listener.Start();
Console.WriteLine("--- Server stated, base path is: " + baseFilesystemPath);
Console.WriteLine("--- Listening, exit with Ctrl-C");
try
{
ServerLoop();
}
catch(Exception ex)
{
Console.WriteLine(ex);
if(response != null)
{
SendErrorResponse(500, "Internal server error");
}
}
}
static void ServerLoop()
{
while(true)
{
var context = listener.GetContext();
var request = context.Request;
response = context.Response;
var fileName = request.RawUrl.Substring(1);
Console.WriteLine(
"--- Got {0} request for: {1}",
request.HttpMethod, fileName);
if (request.HttpMethod.ToUpper() != "GET")
{
SendErrorResponse(405, "Method must be GET");
continue;
}
var fullFilePath = Path.Combine(baseFilesystemPath, fileName);
if(!File.Exists(fullFilePath))
{
SendErrorResponse(404, "File not found");
continue;
}
Console.Write(" Sending file...");
using (var fileStream = File.OpenRead(fullFilePath))
{
response.ContentType = "application/octet-stream";
response.ContentLength64 = (new FileInfo(fullFilePath)).Length;
response.AddHeader(
"Content-Disposition",
"Attachment; filename=\"" + Path.GetFileName(fullFilePath) + "\"");
fileStream.CopyTo(response.OutputStream);
}
response.OutputStream.Close();
response = null;
Console.WriteLine(" Ok!");
}
}
static void SendErrorResponse(int statusCode, string statusResponse)
{
response.ContentLength64 = 0;
response.StatusCode = statusCode;
response.StatusDescription = statusResponse;
response.OutputStream.Close();
Console.WriteLine("*** Sent error: {0} {1}", statusCode, statusResponse);
}
}
