Question

i am trying to build simple web server, that able to transfer files.
I know, there is a lot of examples, but most of them too complex to understand for someone who never worked with HTTP
So i have…

    public Hashtable MimeTypes = new Hashtable();

    public HttpServer(int port)
    {
        this.port = port;

        MimeTypes.Add("html", "text/html");
        MimeTypes.Add("htm", "text/html");
        MimeTypes.Add("css", "text/css");
        MimeTypes.Add("js", "application/x-javascript");

        MimeTypes.Add("png", "image/png");
        MimeTypes.Add("gif", "image/gif");
        MimeTypes.Add("jpg", "image/jpeg");
        MimeTypes.Add("jpeg", "image/jpeg");
    }

    public void writeSuccess(string mime_type, string file_name, int file_size)
    {
        outputStream.Write("HTTP/1.0 200 OK\n");
        outputStream.Write("Content-Type: " + mime_type + "\n");

        if (file_name != null)//if file name isn't null, this mean we need to add additional headers
        {
            outputStream.Write("Content-Disposition: attachment; filename=" + file_name);
            outputStream.Write("Content-Length: " + file_size);
        }

        outputStream.Write("Connection: close\n");
        outputStream.Write("\n");
    }

public override void handleGETRequest(HttpProcessor p)
{
    Console.WriteLine("request: {0}", p.http_url);

    byte[] file_content = null;

    try { file_content = File.ReadAllBytes(work_folder + p.http_url); } //tring to read requested file
    catch (Exception exc) { p.writeFailure(); return; } //return failure if no such file

    string[] splitted_html_url = p.http_url.Split(new char[] { '.' }, StringSplitOptions.RemoveEmptyEntries ); //splitting url for future format check

    string mime_type = "application/octet-stream"; //the most generic type

    if (MimeTypes.Contains(splitted_html_url[splitted_html_url.Length - 1]))
        mime_type = (string)MimeTypes[splitted_html_url[splitted_html_url.Length - 1]]; //set mimy type that math to requested file format

    if (mime_type.Contains("image") || mime_type == "application/octet-stream") //hacky thing for tests...
        p.writeSuccess(mime_type, p.http_url.Remove(0, 1), file_content.Length); //if mime type is image or unknown, than pass file name and length to responce builder
    else
        p.writeSuccess(mime_type, null, 0); //er else just add general headers

    p.outputStream.Write(Encoding.ASCII.GetString(file_content)); //write file content after headers
}

It works for HTML transfers, but i can’t make it transfer images 🙁
If i make html page with this tag:

<img src = "logo225x90.gif" width = "100%" height = "100%" />

and place this file to right directory, it still showed in browser as missing file

Answer 1

I think you are making multiple mistakes.

• You are assuming that you can avoid all the complexity of the example code.
• Instead of pasting your code and make somebody do your work you should educate yourself about HTTP – it shouldn’t be too hard for the scope of your task
• You are writing code to do something which can be done by IIS which runs your code (if you run your code on IIS)
• You are writing the file as string with p.outputStream.Write(Encoding.ASCII.GetString(file_content)); //write file content after headers


I suggest:

• Don’t use the CodeProject example you are using;
• Try the ServiceStack project (your may want to read ServiceStack and returning a stream)