VB.Net (3504 ตัวอักษร):
Imports System.IO:Imports System.Net:Imports System.Net.Sockets:Imports System.Text:Imports System.Text.RegularExpressions:Module x:Dim s=1024,ct As New Dictionary(Of String,String)From{{".htm","text/html"},{".html","text/html"},{".js","text/javascript"},{".css","text/css"},{".png","image/png"},{".jpg","image/jpeg"},{".jpeg","image/jpeg"},{".gif","image/gif"}}:Function b$(f$):Dim ext$=Path.GetExtension(f$):Return If(ct.ContainsKey(ext$),ct(ext$),"text/plain"):End Function:Sub Main(a$()):Try:Dim z As New Dictionary(Of String,String)From{{"--port","8080"},{"--address","127.0.0.1"},{"--base",""}}:For i As Integer=0 To a.Length-2:If a$(i).StartsWith("-")AndAlso z.ContainsKey(a$(i))Then:z(a$(i))=a$(i+1):Next:Dim b$=Path.Combine(My.Computer.FileSystem.CurrentDirectory,z("--base")),s As New TcpListener(IPAddress.Parse(z("--address")),Integer.Parse(z("--port"))),c As TcpServer:s.Start():Do:c=s.AcceptTcpServer():Dim ns As NetworkStream=c.GetStream():Dim sd As New Text.StringBuilder(),rd(s-1)As Byte,r As Integer:Do:r=ns.Read(rd,0,s):sd.Append(Encoding.UTF8.GetString(rd,0,r)):Loop While r=s:Try:If sd.Length>0 Then:Dim dd$=sd.ToString(),h$()=dd$.Split({ControlChars.Cr,ControlChars.Lf},StringSplitOptions.RemoveEmptyEntries),br$()=h$(0).Split(" "c),mt$=br$(0),f$=br$(1).Substring(1),af$=Path.Combine(b$,Uri.UnescapeDataString(Regex.Replace(f$,"\?.*$","")).TrimStart("/"c).Replace("/"c,"\"c)),hv$=br$(2),rh As New Dictionary(Of String,String),sc$="200",sr$="OK",rc()As Byte={}:If hv$<>"HTTP/1.0"AndAlso hv$<>"HTTP/1.1"Then:sc$="505":sr$="HTTP Version Not Supported":rc=Encoding.UTF8.GetBytes("505"&sr$):Else:Try:If f$=String.Empty OrElse f$="/"Then:af$=Path.Combine(b$,"index.html"):f$="/":ElseIf Directory.Exists(af$)Then:af$=Path.Combine(af$,"index.html"):End If:Catch:End Try:If mt$="GET"Then:If f$.Contains("..")Then:sc$="403":sr$="Forbidden":rc=Encoding.UTF8.GetBytes(sc$&" "&sr$):Console.WriteLine("{0} forbidden.",f$):ElseIf Not File.Exists(af$)Then:sc$="404":sr$="Not Found":rc=Encoding.UTF8.GetBytes(sc$&" "&sr$):Console.WriteLine("{0} resulted in 404 Not Found. Path {1}.",f$,af$):Else:Try:rc=File.ReadAllBytes(af$):rh.Add("Content-Length",rc.Length&""):rh.Add("Content-Type",b$(af$)):Catch:sc$="403":sr$="Forbidden":rc = Encoding.UTF8.GetBytes(sc$&" "&sr$):End Try:End If:ElseIf mt$="HEAD"Then:If f$.Contains("..")Then:sc$="403":sr$="Forbidden":rc=Encoding.UTF8.GetBytes(sc$&" "&sr$):Console.WriteLine("{0} forbidden.",f$):ElseIf Not File.Exists(af$)Then:sc$="404":sr$="Not Found":rc=Encoding.UTF8.GetBytes(sc$&" "&sr$):Console.WriteLine("404 Not Found: {0}",f$):Else:Try:rh.Add("Content-Length",New FileInfo(af$).Length&""):rh.Add("Content-Type",b$(af$)):Catch:sc$="403":sr$="Forbidden":rc = Encoding.UTF8.GetBytes(sc$&" "&sr$):End Try:End If:Else:sc$="405":sr$="Method Not Allowed":End If:Dim rr As New List(Of Byte):rr.AddRange(Encoding.UTF8.GetBytes("HTTP/1.1 "&sc$&sr$&ControlChars.CrLf)):Dim cr As New List(Of String):For Each h As KeyValuePair(Of String,String)In rh:cr.Add(h.Key&": "&h.Value):Next:rr.AddRange(Encoding.UTF8.GetBytes(String.Join(ControlChars.CrLf,cr.ToArray()))):rr.Add(13):rr.Add(10):rr.Add(13):rr.Add(10):rr.AddRange(rc):ns.Write(rr.ToArray(),0,rr.Count):End If:End If:Catch ex As Exception:Console.WriteLine("Error:"):Console.WriteLine(ex.ToString()):Dim e()As Byte=Encoding.UTF8.GetBytes("HTTP/1.1 500 Internal x Error"&ControlChars.CrLf &ControlChars.CrLf &"500 Internal x Error"):ns.Write(e,0,e.Length):End Try:c.Close():Loop:Catch:End Try:End Sub:End Module
นำมารวมกันจากคำตอบของ @ minitech
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ในเส้นทางเป็นวิธีการแยกออกจากรากเอกสารที่กำหนดไว้)