[RESOLVED] HTTP Server Response Headers
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  1. #1
    Join Date
    Apr 2011
    Location
    England
    Posts
    14

    [RESOLVED] HTTP Server Response Headers

    Hi i need to make a BASIC HTTP server for a project using JUST TCP/IP Sockets so please don't suggest anything that would use some of C#'s higher level networking components, Thanks =).

    Anyway my problem:

    i have created the server and it all works so far but i haven't implemented the HTTP Headers properly, if i leave out all the headers i wrote then some browsers work fine with it (can't remember which) but when i add in the headers (and change them around trying to get it to work) it only shows part of the page or doesn't load the css file and once it just showed half of the html code!

    btw i dont know if this makes a difference but i use the link tag in my main.html head to get the css file.
    <link rel="stylesheet" type="text/css" href="mainStylesheet.css"/>

    and before anyone asks, the html file works fine if i just run it straight on the browser! =P

    Here is some of my code:
    Code:
    class ConnectionThread
        {
            public ConnectionThread(Socket socket)
            {
                connection = socket;
            }
     
            Socket connection = null;
            NetworkStream mainStream = null;
            BinaryReader inStream = null;
            BinaryWriter outStream = null;
     
            public void run()
            {
                mainStream = new NetworkStream(connection);
     
                inStream = new BinaryReader(mainStream);
                outStream = new BinaryWriter(mainStream);
     
                byte b = 0;
                string s = "";
                string[] requestData = null;
                string requestedPage = null;
     
                try
                {
                    while (mainStream.DataAvailable)
                    {
                        b = inStream.ReadByte();
                        s += (char)b;
                    }
     
                    requestData = s.Split('\r');
     
                    int l = requestData.Length;
     
                    //check to see if it got the request data (sometimes it doesn't)
                    if (l > 1) 
                    {
                        //get the page the browser requests
                        requestedPage = requestData[0].Split(' ')[1];
     
                        //calls the method which sends the browser the page to be displayed
                        theSwitch(requestedPage);
                    }
                    else
                    {
                        //call method again to try and get the request data
                        run();
                    }
                }            
                catch (Exception exp)
                {
                    Console.WriteLine("Unexpected error.");
                    Console.WriteLine("Error caused by: " + exp.Message);                
                }
            }
     
            void theSwitch(string item)
            {
                string file = null;
                char[] output = null;
                string head = null;
     
                try
                {
                    switch (item)
                    {
                        case "/":
     
                            file = readFile("Resources/main.html");
     
                            head += "HTTP/1.1 100 Continue\r\n";
                            head += String.Format("{0:ddd, dd MMM yy HH:mm:ss} GMT\r\n", DateTime.Now);
                            head += "Server: Ollie's Server v1.0\r\n";
                            head += "Cache-Control: none\r\n";
                            head += "Content-Type: text/html\r\n";
                            head += string.Format("Content-Length: {0}\r\n", file.Length);
                            head += "<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.0 Transitional//EN\">\r\n";
     
                            Console.WriteLine(head);
                            output = (head + file).ToArray();
     
                            outStream.Write(output);
     
                            break;
     
                        case "Resources/mainStylesheet.css":
     
                            file = readFile("/mainStylesheet.css");
     
                            head += "HTTP/ 1.1 100 Continue\r\n";
                            head += String.Format("{0:ddd, dd MMM yy HH:mm:ss} GMT\r\n", DateTime.Now);
                            head += "Server: Ollie's Server v1.0\r\n";
                            head += "Cache-Control: none\r\n";
                            head += "Content-Type: text/css\r\n";
                            head += string.Format("Content-Length: {0}\r\n", file.Length);
     
                            output = (head + file).ToArray();
     
                            outStream.Write(file);
     
                            break;
     
                        case "Resources/favicon.ico":
     
                            MemoryStream ms = new MemoryStream();
                            System.Drawing.Image i = System.Drawing.Image.FromFile("Resources/favicon.gif");
                            i.Save(ms, System.Drawing.Imaging.ImageFormat.Gif);
     
                            head += "HTTP/1.1 206 Partial content";
                            head += String.Format("{0:ddd, dd MMM yy HH:mm:ss} GMT\r\n", DateTime.Now);
                            head += "Server: Ollie's Server v1.0\r\n";
                            head += "Cache-Control: none\r\n";
                            head += "Content-Type: image/gif\r\n";
                            head += string.Format("Content-Length: {0}\r\n", ms.Length);
     
                            output = (head + ms).ToArray();
     
                            outStream.Write(output);
     
                            break;
     
                        default:
     
                            Console.WriteLine("Not Found");
                            Console.WriteLine();
     
                            break;
                    }
     
                    inStream.Close();
     
                    outStream.Flush();
                    outStream.Close();
     
                    mainStream.Close();
     
                    connection.Close();
     
                }
                catch (Exception exp)
                {
                    Console.WriteLine("Unexpected error.");
                    Console.WriteLine("Error caused by: " + exp.Message);
                }
            }
     
            //method that returns a string of the html or css file to be sent to the browser
            private string readFile(string file)
            {
                string output = null;
     
                try
                {
                    StreamReader reader = new StreamReader(file);
                    while (!reader.EndOfStream)
                    {
                        output += reader.ReadToEnd();
                    }
                }
                catch (Exception exp)
                {
                    Console.WriteLine(exp.ToString());
                }
     
                return output;
            }
        }
    }
    So i guess my question is what is the correct http headers to use here and also which headers are compulsory and which are just optional?

    i would also like to use the ETag, Accept and Connection header(s) so any info you can supply on them would be greatly appreciated!

    Thanks in advance! =)
    Ollie

  2. #2
    Join Date
    Mar 2011
    Location
    London
    Posts
    54

    Re: HTTP Server Response Headers

    Sounds like an interesting project. Must give that a try sometime.
    This article may help:
    http://www.w3.org/Protocols/rfc2616/...sec4.html#sec4

  3. #3
    Join Date
    Apr 2011
    Location
    England
    Posts
    14

    Re: HTTP Server Response Headers

    yer its really good compared to some of the others i have been given! =)

    yer i looked threw that website as well but couldn't figure out the answer! in the end it was because i hadn't put a new line between the head and the body!! ooops! lol!

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