Code Review Asked by honey the codewitch on December 6, 2021
I’ve got this quick and dirty little console app in C# to serve an HTTP/HTML page.
static void Main()
{
// create a socket
var socket = new Socket(SocketType.Stream, ProtocolType.Tcp);
// bind to localhost:8080
socket.Bind(new IPEndPoint(IPAddress.Loopback, 8080));
socket.Listen(16); // listen
// begin our accept task
var t = socket.AcceptTaskAsync();
// when we're done accepting process the request
t.ContinueWith((task) =>
{
_ProcessRequest(socket, t);
});
// show a prompt and wait for a keypress to exit
Console.WriteLine("Press any key to exit...");
Console.ReadKey();
}
static void _ProcessRequest(Socket socket,Task<Socket> t)
{
Console.Write("Awaiting request...");
t.ContinueWith((task1) =>
{
var s = t.Result;
var rt = s.ReceiveHttpRequestAsync();
rt.ContinueWith((task2) =>
{
Console.Write("Done: ");
var req = rt.Result;
Console.WriteLine(req.Method + " " + req.Url);
// our html to send
var html = "<html><head><title>Hello</title></head><body><h1>Hello World!</h1></body>";
var headers = "HTTP/1.1 200 OKnDate: "
+ DateTime.Now.ToUniversalTime().ToString("r")
+ "nContent-Type: text/htmlnContent-Length: "
+ html.Length.ToString()
+ "nConnection: Closedn";
s.SendAsync(headers + "n" + html, Encoding.UTF8)
.ContinueWith((task3) =>
{
s.DisconnectAsync(false);
t = socket.AcceptTaskAsync();
t.ContinueWith((task4) =>
{
_ProcessRequest(socket, t);
});
}).Wait();
s.Close();
});
});
}
I’m calling async TAP methods on a socket because I use an EAP->TAP adapter class that I built up from this code:
https://blogs.msdn.microsoft.com/pfxteam/2011/12/15/awaiting-socket-operations/
It appears to work, and it has little to do with my question, which has to do with handling incoming requests using TAP. I’ve also got HttpReceiveRequestAsync which I’ve used for a year and isn’t important here.
Basically what I’m trying to do is accept on a socket and then asynchronously serve the request, and then accept on a socket again to keep it going. The code works, but I don’t think it works right. For one thing, my _ProcessRequest() routine is getting called 3 times every time I refresh the browser (i’m using chrome) – i know chrome will sometimes initiate multiple requests but i think it will only do two. Edit: I figured out why this is, and it’s fine
Also this seems dodgy. I don’t know why but there’s code smell, and not just because I threw it together. I don’t trust it. Can anyone take a look and see if there isn’t a better way to do this? I’m pretty new at this.
Edit: I fixed it up and I trust it more now, but I just wanted to see if it could be improved, or if there is some better pattern for this. I don’t care about using async/await keywords unless it significantly eases things. Sometimes it does. Here I didn’t find much use.
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