stackprobe7s_memo

専ら自分用メモ

HTTPサーバーを作る (C#)

手順は以下のとおり

  • Visual Studio Community 2019 をインストールしておく
    • Visual Studio Installer のワークロードで以下にチェックを入れておけば良いはず。
      • .NET デスクトップ開発
  • Visual Studio 2019 (devenv.exe) を起動してソリューションを作成
    • 新しいプロジェクトの作成
    • C# コンソールアプリケーション
    • プロジェクト名・ソリューション名は SimpleWebServer (別の名前でも可)
    • ターゲットフレームワーク .NET Core 3.1 (.NET 5.0 でも可)
    • んで「作成」
  • SimpleWebServer クラスの作成
    • プロジェクトに SimpleWebServer.cs という空のクラスを追加する。
    • 下記コード (_SimpleWebServer_cs_) を今しがた追加した SimpleWebServer.cs にコピペする。
  • SimpleWebServer を呼び出すコードを記述
    • Program.cs の Main メソッドの中身を以下のとおり記述する。(ドキュメントルート, ポート番号は適宜変更して下さい)
static void Main(string[] args)
{
	SimpleWebServer.Run(
		@"C:\www\DocRoot",   // ドキュメントルート (index.html 等を配置したフォルダ) を指定する。
		80                   // ポート番号 (特に理由が無ければ 80 を指定する)
		);
}
  • 5Fで実行すればHTTPサーバーが起動します。
    • 試しに http://localhost を開いてみて下さい。指定したドキュメントルートにある index.html (index.htm) が表示されるはずです。

_SimpleWebServer_cs_

using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.IO;
using System.Linq;
using System.Net;
using System.Net.Sockets;
using System.Text;
using System.Threading;

namespace SimpleWebServer // ★名前空間は適宜変えて下さい。
{
	public class SimpleWebServer
	{
		/// <summary>
		/// ドキュメントルート
		/// </summary>
		public string DocRoot = @"C:\www\DocRoot";

		/// <summary>
		/// ポート番号
		/// </summary>
		public int PortNo = 80;

		/// <summary>
		/// サーバー処理の合間に呼ばれる処理
		/// 戻り値:
		/// -- サーバーを継続するか
		/// </summary>
		public Func<bool> Interlude = () => !Console.KeyAvailable; // 何かキーを押したらサーバー終了

		// インスタンスの設定ここまで

		/// <summary>
		/// Keep-Alive-タイムアウト_ミリ秒
		/// -1 == INFINITE
		/// </summary>
		public static int KeepAliveTimeoutMillis = 5000;

		/// <summary>
		/// 要求タイムアウト_ミリ秒
		/// -1 == INFINITE
		/// </summary>
		public static int RequestTimeoutMillis = -1;

		/// <summary>
		/// 応答タイムアウト_ミリ秒
		/// -1 == INFINITE
		/// </summary>
		public static int ResponseTimeoutMillis = -1;

		/// <summary>
		/// リクエストの最初の行のみの無通信タイムアウト_ミリ秒
		/// -1 == INFINITE
		/// </summary>
		public static int FirstLineTimeoutMillis = 2000;

		/// <summary>
		/// リクエストの最初の行以外の(レスポンスも含む)無通信タイムアウト_ミリ秒
		/// -1 == INFINITE
		/// </summary>
		public static int IdleTimeoutMillis = 600000;

		/// <summary>
		/// スレッド占用タイムアウト_ミリ秒
		/// -1 == INFINITE
		/// </summary>
		public static int ThreadTimeoutMillis = 100;

		/// <summary>
		/// リクエストのボディの最大サイズ_バイト数
		/// -1 == INFINITE
		/// </summary>
		public static int BodySizeMax = 300000000;

		/// <summary>
		/// 接続待ちキューの長さ
		/// </summary>
		public static int Backlog = 300;

		/// <summary>
		/// 最大同時接続数
		/// </summary>
		public static int ConnectMax = 100;

		// 設定ここまで

		public static void Run(string docRoot, int portNo)
		{
			try
			{
				if (string.IsNullOrEmpty(docRoot))
					throw new Exception("ドキュメントルートを指定して下さい。");

				if (!Directory.Exists(docRoot))
					throw new Exception("ドキュメントルートは存在しません:" + docRoot);

				if (portNo < 1 || 65535 < portNo)
					throw new Exception("不正なポート番号です:" + portNo);

				new SimpleWebServer()
				{
					DocRoot = docRoot,
					PortNo = portNo,
				}
				.Perform();
			}
			catch (Exception e)
			{
				WriteLog(e);
			}
		}

		public void Perform()
		{
			HTTPServer hs = new HTTPServer();

			hs.HTTPConnected = this.P_Connected;

			hs.Perform(this.PortNo, this.Interlude);
		}

		private void P_Connected(HTTPServerChannel channel)
		{
			WriteLog("Client: " + channel.Channel.Handler.RemoteEndPoint);

			if (7 < channel.Method.Length) // ? 最も長いメソッドより長い。
				throw new Exception("Received method is too long");

			WriteLog("Method: " + channel.Method);

			switch (channel.Method)
			{
				case "GET":
					this.GetOrHead(channel, false);
					break;

				case "HEAD":
					this.GetOrHead(channel, true);
					break;

				case "POST":
					throw new Exception("Unsupported method");

				case "PUT":
					throw new Exception("Unsupported method");

				case "DELETE":
					throw new Exception("Unsupported method");

				case "CONNECT":
					throw new Exception("Unsupported method");

				case "OPTIONS":
					throw new Exception("Unsupported method");

				case "TRACE":
					throw new Exception("Unsupported method");

				case "PATCH":
					throw new Exception("Unsupported method");

				default:
					throw new Exception("Unknown method");
			}
		}

		private void GetOrHead(HTTPServerChannel channel, bool head)
		{
			string urlPath = channel.PathQuery;

			// クエリ除去
			{
				int ques = urlPath.IndexOf('?');

				if (ques != -1)
					urlPath = urlPath.Substring(0, ques);
			}

			if (1000 < urlPath.Length) // rough limit
				throw new Exception("Received path is too long");

			WriteLog("URL-Path:" + urlPath);

			string[] pTkns = urlPath.Split('/').Where(v => v != "").Select(v => ToFairLocalPath(v, 0)).ToArray();
			string path = Path.Combine(new string[] { this.DocRoot }.Concat(pTkns).ToArray());

			WriteLog("RealPath:" + path);

			if (urlPath.EndsWith("/"))
			{
				path = Path.Combine(path, "index.htm");

				if (!File.Exists(path))
					path += "l";
			}
			else if (Directory.Exists(path))
			{
				channel.ResStatus = 301;
				channel.ResHeaderPairs.Add(new string[] { "Location", $"http://{channel.GetHeaderValue("Host")}/{string.Join("", pTkns.Select(v => EncodeUrl(v)))}/" });
				//channel.ResBody = null;

				goto response;
			}
			if (File.Exists(path))
			{
				//channel.ResStatus = 200;
				channel.ResHeaderPairs.Add(new string[] { "Content-Type", ContentTypeCollection.I.GetContentType(Path.GetExtension(path)) });
				channel.ResBody = E_ReadFile(path);
			}
			else
			{
				channel.ResStatus = 404;
				//channel.ResHeaderPairs.Add();
				//channel.ResBody = null;
			}

		response:
			channel.ResHeaderPairs.Add(new string[] { "Server", "sws" });

			if (head && channel.ResBody != null)
			{
				FileInfo fileInfo = new FileInfo(path);

				channel.ResHeaderPairs.Add(new string[] { "Content-Length", fileInfo.Length.ToString() });
				channel.ResHeaderPairs.Add(new string[] { "X-Last-Modified-Time", fileInfo.LastWriteTime.Ticks.ToString() });

				channel.ResBody = null;
			}

			WriteLog("Res-Status: " + channel.ResStatus);

			foreach (string[] pair in channel.ResHeaderPairs)
				WriteLog($"Res-Header: {pair[0]} = {pair[1]}");

			WriteLog("Res-Body: " + (channel.ResBody != null));
		}

		private static string EncodeUrl(string str)
		{
			StringBuilder buff = new StringBuilder();

			foreach (byte chr in Encoding.UTF8.GetBytes(str))
			{
				buff.Append('%');
				buff.Append(chr.ToString("x2"));
			}
			return buff.ToString();
		}

		private static IEnumerable<byte[]> E_ReadFile(string file)
		{
			long fileSize = new FileInfo(file).Length;

			for (long offset = 0L; offset < fileSize;)
			{
				int readSize = (int)Math.Min(fileSize - offset, 2000000L);
				byte[] buff = new byte[readSize];

				WriteLog($"Read: {offset} {readSize} {fileSize} {(offset * 100.0 / fileSize).ToString("F2")} {((offset + readSize) * 100.0 / fileSize).ToString("F2")}");

				using (FileStream reader = new FileStream(file, FileMode.Open, FileAccess.Read))
				{
					reader.Seek(offset, SeekOrigin.Begin);
					reader.Read(buff, 0, readSize);
				}
				yield return buff;

				offset += (long)readSize;
			}
		}

		private class ContentTypeCollection
		{
			private static ContentTypeCollection _i = null;

			public static ContentTypeCollection I
			{
				get
				{
					if (_i == null)
						_i = new ContentTypeCollection();

					return _i;
				}
			}

			#region Extension2ContentTypeResource

			/// <summary>
			/// https://github.com/stackprobe/HTT/blob/master/doc/MimeType.tsv
			/// </summary>
			private static string[] Extension2ContentTypeResource = new string[]
			{
				".323", "text/h323",
				".acx", "application/internet-property-stream",
				".ai", "application/postscript",
				".aif", "audio/x-aiff",
				".aifc", "audio/x-aiff",
				".aiff", "audio/x-aiff",
				".asf", "video/x-ms-asf",
				".asr", "video/x-ms-asf",
				".asx", "video/x-ms-asf",
				".au", "audio/basic",
				".avi", "video/x-msvideo",
				".axs", "application/olescript",
				".bas", "text/plain",
				".bcpio", "application/x-bcpio",
				".bin", "application/octet-stream",
				".bmp", "image/bmp",
				".c", "text/plain",
				".cat", "application/vnd.ms-pkiseccat",
				".cdf", "application/x-cdf",
				".cer", "application/x-x509-ca-cert",
				".class", "application/octet-stream",
				".clp", "application/x-msclip",
				".cmx", "image/x-cmx",
				".cod", "image/cis-cod",
				".cpio", "application/x-cpio",
				".crd", "application/x-mscardfile",
				".crl", "application/pkix-crl",
				".crt", "application/x-x509-ca-cert",
				".csh", "application/x-csh",
				".css", "text/css",
				".dcr", "application/x-director",
				".der", "application/x-x509-ca-cert",
				".dir", "application/x-director",
				".dll", "application/x-msdownload",
				".dms", "application/octet-stream",
				".doc", "application/msword",
				".dot", "application/msword",
				".dvi", "application/x-dvi",
				".dxr", "application/x-director",
				".eps", "application/postscript",
				".etx", "text/x-setext",
				".evy", "application/envoy",
				".exe", "application/octet-stream",
				".fif", "application/fractals",
				".flr", "x-world/x-vrml",
				".gif", "image/gif",
				".gtar", "application/x-gtar",
				".gz", "application/x-gzip",
				".h", "text/plain",
				".hdf", "application/x-hdf",
				".hlp", "application/winhlp",
				".hqx", "application/mac-binhex40",
				".hta", "application/hta",
				".htc", "text/x-component",
				".htm", "text/html",
				".html", "text/html",
				".htt", "text/webviewhtml",
				".ico", "image/x-icon",
				".ief", "image/ief",
				".iii", "application/x-iphone",
				".ins", "application/x-internet-signup",
				".isp", "application/x-internet-signup",
				".jfif", "image/pipeg",
				".jpe", "image/jpeg",
				".jpeg", "image/jpeg",
				".jpg", "image/jpeg",
				".js", "application/x-javascript",
				".json", "application/json",
				".latex", "application/x-latex",
				".lha", "application/octet-stream",
				".lsf", "video/x-la-asf",
				".lsx", "video/x-la-asf",
				".lzh", "application/octet-stream",
				".m13", "application/x-msmediaview",
				".m14", "application/x-msmediaview",
				".m3u", "audio/x-mpegurl",
				".m4a", "audio/aac",
				".m4v", "video/mp4",
				".man", "application/x-troff-man",
				".mdb", "application/x-msaccess",
				".me", "application/x-troff-me",
				".mht", "message/rfc822",
				".mhtml", "message/rfc822",
				".mid", "audio/midi",
				".midi", "audio/midi",
				".mny", "application/x-msmoney",
				".mov", "video/quicktime",
				".movie", "video/x-sgi-movie",
				".mp2", "video/mpeg",
				".mp3", "audio/mpeg",
				".mp4", "video/mp4",
				".mpa", "video/mpeg",
				".mpe", "video/mpeg",
				".mpeg", "video/mpeg",
				".mpg", "video/mpeg",
				".mpga", "audio/mpeg",
				".mpp", "application/vnd.ms-project",
				".mpv2", "video/mpeg",
				".ms", "application/x-troff-ms",
				".mvb", "application/x-msmediaview",
				".nws", "message/rfc822",
				".oda", "application/oda",
				".ogv", "video/ogg",
				".p10", "application/pkcs10",
				".p12", "application/x-pkcs12",
				".p7b", "application/x-pkcs7-certificates",
				".p7c", "application/x-pkcs7-mime",
				".p7m", "application/x-pkcs7-mime",
				".p7r", "application/x-pkcs7-certreqresp",
				".p7s", "application/x-pkcs7-signature",
				".pbm", "image/x-portable-bitmap",
				".pdf", "application/pdf",
				".pfx", "application/x-pkcs12",
				".pgm", "image/x-portable-graymap",
				".pko", "application/ynd.ms-pkipko",
				".pma", "application/x-perfmon",
				".pmc", "application/x-perfmon",
				".pml", "application/x-perfmon",
				".pmr", "application/x-perfmon",
				".pmw", "application/x-perfmon",
				".png", "image/png",
				".pnm", "image/x-portable-anymap",
				".pot", "application/vnd.ms-powerpoint",
				".ppm", "image/x-portable-pixmap",
				".pps", "application/vnd.ms-powerpoint",
				".ppt", "application/vnd.ms-powerpoint",
				".prf", "application/pics-rules",
				".ps", "application/postscript",
				".pub", "application/x-mspublisher",
				".qt", "video/quicktime",
				".ra", "audio/x-pn-realaudio",
				".ram", "audio/x-pn-realaudio",
				".ras", "image/x-cmu-raster",
				".rgb", "image/x-rgb",
				".rmi", "audio/mid",
				".roff", "application/x-troff",
				".rtf", "application/rtf",
				".rtx", "text/richtext",
				".scd", "application/x-msschedule",
				".sct", "text/scriptlet",
				".setpay", "application/set-payment-initiation",
				".setreg", "application/set-registration-initiation",
				".sh", "application/x-sh",
				".shar", "application/x-shar",
				".sit", "application/x-stuffit",
				".snd", "audio/basic",
				".spc", "application/x-pkcs7-certificates",
				".spl", "application/futuresplash",
				".src", "application/x-wais-source",
				".sst", "application/vnd.ms-pkicertstore",
				".stl", "application/vnd.ms-pkistl",
				".stm", "text/html",
				".sv4cpio", "application/x-sv4cpio",
				".sv4crc", "application/x-sv4crc",
				".svg", "image/svg+xml",
				".swf", "application/x-shockwave-flash",
				".t", "application/x-troff",
				".tar", "application/x-tar",
				".tcl", "application/x-tcl",
				".tex", "application/x-tex",
				".texi", "application/x-texinfo",
				".texinfo", "application/x-texinfo",
				".tgz", "application/x-compressed",
				".tif", "image/tiff",
				".tiff", "image/tiff",
				".tr", "application/x-troff",
				".trm", "application/x-msterminal",
				".tsv", "text/tab-separated-values",
				".txt", "text/plain",
				".uls", "text/iuls",
				".ustar", "application/x-ustar",
				".vcf", "text/x-vcard",
				".vrml", "x-world/x-vrml",
				".wav", "audio/x-wav",
				".wcm", "application/vnd.ms-works",
				".wdb", "application/vnd.ms-works",
				".webm", "video/webm",
				".wks", "application/vnd.ms-works",
				".wmf", "application/x-msmetafile",
				".wps", "application/vnd.ms-works",
				".wri", "application/x-mswrite",
				".wrl", "x-world/x-vrml",
				".wrz", "x-world/x-vrml",
				".xaf", "x-world/x-vrml",
				".xbm", "image/x-xbitmap",
				".xht", "application/xhtml+xml",
				".xhtml", "application/xhtml+xml",
				".xla", "application/vnd.ms-excel",
				".xlc", "application/vnd.ms-excel",
				".xlm", "application/vnd.ms-excel",
				".xls", "application/vnd.ms-excel",
				".xlt", "application/vnd.ms-excel",
				".xlw", "application/vnd.ms-excel",
				".xml", "text/xml",
				".xof", "x-world/x-vrml",
				".xpm", "image/x-xpixmap",
				".xsl", "text/xml",
				".xwd", "image/x-xwindowdump",
				".z", "application/x-compress",
				".zip", "application/zip",
			};

			#endregion

			private Dictionary<string, string> Extension2ContentType = CreateDictionaryIgnoreCase<string>();

			private ContentTypeCollection()
			{
				for (int index = 0; index < Extension2ContentTypeResource.Length; index += 2)
					this.Extension2ContentType.Add(Extension2ContentTypeResource[index], Extension2ContentTypeResource[index + 1]);
			}

			public string GetContentType(string ext)
			{
				if (this.Extension2ContentType.ContainsKey(ext))
					return this.Extension2ContentType[ext];

				return "application/octet-stream"; // デフォルト
			}
		}

		private class HTTPServer : SockServer
		{
			/// <summary>
			/// サーバーロジック
			/// 引数:
			/// -- channel: 接続チャネル
			/// </summary>
			public Action<HTTPServerChannel> HTTPConnected = channel => { };

			protected override IEnumerable<int> E_Connected(SockChannel channel)
			{
				DateTime startedTime = DateTime.Now;

				for (; ; )
				{
					HTTPServerChannel hsChannel = new HTTPServerChannel();
					int retval = -1;

					hsChannel.Channel = channel;

					foreach (int size in hsChannel.RecvRequest())
					{
						if (size == 0)
							throw null; // never

						if (size < 0)
						{
							yield return retval;
							retval = -1;
						}
						else
							retval = 1;
					}

					HTTPConnected(hsChannel);

					if (KeepAliveTimeoutMillis != -1 && KeepAliveTimeoutMillis < (DateTime.Now - startedTime).TotalMilliseconds)
					{
						hsChannel.KeepAlive = false;
					}

					foreach (int size in hsChannel.SendResponse())
					{
						if (size == 0)
							throw null; // never

						if (size < 0)
						{
							yield return retval;
							retval = -1;
						}
						else
							retval = 1;
					}

					if (!hsChannel.KeepAlive)
						break;
				}
			}
		}

		private class HTTPServerChannel
		{
			public SockChannel Channel;

			public IEnumerable<int> RecvRequest()
			{
				this.Channel.SessionTimeoutTime = TimeoutMillisToDateTime(RequestTimeoutMillis);
				this.Channel.P_IdleTimeoutMillis = FirstLineTimeoutMillis;

				foreach (int relay in this.RecvLine(ret => this.FirstLine = ret))
					yield return relay;

				{
					string[] tokens = this.FirstLine.Split(' ');

					this.Method = tokens[0];
					this.PathQuery = DecodeURL(tokens[1]);
					this.HTTPVersion = tokens[2];
				}

				this.Channel.P_IdleTimeoutMillis = IdleTimeoutMillis;

				foreach (int relay in this.RecvHeader())
					yield return relay;

				this.CheckHeader();

				if (this.Expect100Continue)
				{
					foreach (int relay in this.SendLine("HTTP/1.1 100 Continue")
						.Concat(this.Channel.Send(CRLF)))
						yield return relay;
				}
				foreach (int relay in this.RecvBody())
					yield return relay;
			}

			private static DateTime? TimeoutMillisToDateTime(int millis)
			{
				if (millis == -1)
					return null;

				return DateTime.Now + TimeSpan.FromMilliseconds((double)millis);
			}

			private static string DecodeURL(string path)
			{
				byte[] src = Encoding.ASCII.GetBytes(path);

				using (MemoryStream dest = new MemoryStream())
				{
					for (int index = 0; index < src.Length; index++)
					{
						if (src[index] == 0x25) // ? '%'
						{
							dest.WriteByte((byte)Convert.ToInt32(Encoding.ASCII.GetString(new byte[] { src[index + 1], src[index + 2] }), 16));
							index += 2;
						}
						else if (src[index] == 0x2b) // ? '+'
						{
							dest.WriteByte(0x20); // ' '
						}
						else
						{
							dest.WriteByte(src[index]);
						}
					}

					byte[] bytes = dest.ToArray();

					if (!P_UTF8Check.Check(bytes))
						throw new Exception("URL is not Japanese UTF-8");

					return Encoding.UTF8.GetString(bytes);
				}
			}

			public string FirstLine;
			public string Method;
			public string PathQuery;
			public string HTTPVersion;
			public List<string[]> HeaderPairs = new List<string[]>();
			public byte[] Body;

			private const byte CR = 0x0d;
			private const byte LF = 0x0a;

			private readonly byte[] CRLF = new byte[] { CR, LF };

			private IEnumerable<int> RecvLine(Action<string> a_return)
			{
				const int LINE_LEN_MAX = 512000;

				List<byte> buff = new List<byte>(LINE_LEN_MAX);

				for (; ; )
				{
					byte[] chrs = null;

					foreach (int relay in this.Channel.Recv(1, ret => chrs = ret))
						yield return relay;

					byte chr = chrs[0];

					if (chr == CR)
						continue;

					if (chr == LF)
						break;

					if (LINE_LEN_MAX < buff.Count)
						throw new OverflowException("Received line is too long");

					if (chr < 0x20 || 0x7e < chr) // ? not ASCII -> SPACE
						chr = 0x20;

					buff.Add(chr);
				}
				a_return(Encoding.ASCII.GetString(buff.ToArray()));
			}

			private IEnumerable<int> RecvHeader()
			{
				const int HEADERS_LEN_MAX = 612000;
				const int WEIGHT = 1000;

				int roughHeaderLength = 0;

				for (; ; )
				{
					string line = null;

					foreach (int relay in this.RecvLine(ret => line = ret))
						yield return relay;

					if (line == null)
						throw null; // never

					if (line == "")
						break;

					roughHeaderLength += line.Length + WEIGHT;

					if (HEADERS_LEN_MAX < roughHeaderLength)
						throw new OverflowException("Received header is too long");

					if (line[0] <= ' ') // HACK: ライン・フォルディング対応 -- フォルディングは廃止されたっぽい?
					{
						this.HeaderPairs[this.HeaderPairs.Count - 1][1] += line.Trim();
					}
					else
					{
						int colon = line.IndexOf(':');

						if (colon == -1)
							throw new Exception("Bad header line (no colon)");

						this.HeaderPairs.Add(new string[]
						{
							line.Substring(0, colon).Trim(),
							line.Substring(colon + 1).Trim(),
						});
					}
				}
			}

			public string GetHeaderValue(string name)
			{
				string[] pair = this.HeaderPairs.FirstOrDefault(v => EqualsIgnoreCase(v[0], name));

				if (pair == null)
					throw new Exception("No header key: " + name);

				return pair[1];
			}

			public int ContentLength = 0;
			public bool Chunked = false;
			public string ContentType = null;
			public bool Expect100Continue = false;
			public bool KeepAlive = false;

			private void CheckHeader()
			{
				foreach (string[] pair in this.HeaderPairs)
				{
					string key = pair[0];
					string value = pair[1];

					if (1000 < key.Length || 1000 < value.Length) // rough limit
					{
						WriteLog("Ignore gen-header key and value (too long)");
						continue;
					}

					if (EqualsIgnoreCase(key, "Content-Length"))
					{
						if (value.Length < 1 || 10 < value.Length)
							throw new Exception("Bad Content-Length value");

						this.ContentLength = int.Parse(value);
					}
					else if (EqualsIgnoreCase(key, "Transfer-Encoding"))
					{
						this.Chunked = ContainsIgnoreCase(value, "chunked");
					}
					else if (EqualsIgnoreCase(key, "Content-Type"))
					{
						this.ContentType = value;
					}
					else if (EqualsIgnoreCase(key, "Expect"))
					{
						this.Expect100Continue = ContainsIgnoreCase(value, "100-continue");
					}
					else if (EqualsIgnoreCase(key, "Connection"))
					{
						this.KeepAlive = ContainsIgnoreCase(value, "keep-alive");
					}
				}
			}

			private IEnumerable<int> RecvBody()
			{
				const int READ_SIZE_MAX = 2000000;

				HTTPBodyOutputStream buff = this.Channel.BodyOutputStream;

				if (this.Chunked)
				{
					for (; ; )
					{
						string line = null;

						foreach (int relay in this.RecvLine(ret => line = ret))
							yield return relay;

						if (line == null)
							throw null; // never

						// chunk-extension の削除
						{
							int i = line.IndexOf(';');

							if (i != -1)
								line = line.Substring(0, i);
						}

						line = line.Trim();

						if (line.Length < 1 || 8 < line.Length)
							throw new Exception("Bad chunk-size line");

						int size = Convert.ToInt32(line, 16);

						if (size == 0)
							break;

						if (size < 0)
							throw new Exception("Bad chunk-size: " + size);

						if (BodySizeMax != -1 && BodySizeMax - buff.Count < size)
							throw new Exception($"Chunk is too big: {buff.Count} + {size}");

						int chunkEnd = buff.Count + size;

						while (buff.Count < chunkEnd)
						{
							byte[] data = null;

							foreach (int relay in this.Channel.Recv(Math.Min(READ_SIZE_MAX, chunkEnd - buff.Count), ret => data = ret))
								yield return relay;

							if (data == null)
								throw null; // never

							buff.Write(data);
						}
						foreach (int relay in this.Channel.Recv(2, ret => { })) // CR-LF
							yield return relay;
					}

					for (; ; ) // RFC 7230 4.1.2 Chunked Trailer Part
					{
						string line = null;

						foreach (int relay in this.RecvLine(ret => line = ret))
							yield return relay;

						if (line == null)
							throw null; // never

						if (line == "")
							break;
					}
				}
				else
				{
					if (this.ContentLength < 0)
						throw new Exception("Bad Content-Length: " + this.ContentLength);

					if (BodySizeMax != -1 && BodySizeMax < this.ContentLength)
						throw new Exception("Body is too big: " + this.ContentLength);

					while (buff.Count < this.ContentLength)
					{
						byte[] data = null;

						foreach (int relay in this.Channel.Recv(Math.Min(READ_SIZE_MAX, this.ContentLength - buff.Count), ret => data = ret))
							yield return relay;

						if (data == null)
							throw null; // never

						buff.Write(data);
					}
				}
				this.Body = buff.ToByteArray();
			}

			public int ResStatus = 200;
			public List<string[]> ResHeaderPairs = new List<string[]>();
			public IEnumerable<byte[]> ResBody = null;

			public IEnumerable<int> SendResponse()
			{
				this.Body = null;
				this.Channel.SessionTimeoutTime = TimeoutMillisToDateTime(ResponseTimeoutMillis);

				foreach (int relay in this.SendLine("HTTP/1.1 " + this.ResStatus + " Hello Happy World"))
					yield return relay;

				foreach (string[] pair in this.ResHeaderPairs)
					foreach (int relay in this.SendLine(pair[0] + ": " + pair[1]))
						yield return relay;

				if (this.ResBody == null)
				{
					foreach (int relay in this.EndHeader())
						yield return relay;
				}
				else
				{
					IEnumerator<byte[]> resBodyIterator = this.ResBody.GetEnumerator();

					if (resBodyIterator.MoveNext())
					{
						byte[] first = resBodyIterator.Current;

						if (resBodyIterator.MoveNext())
						{
							foreach (int relay in this.SendLine("Transfer-Encoding: chunked")
								.Concat(this.EndHeader())
								.Concat(this.SendChunk(first)))
								yield return relay;

							do
							{
								foreach (int relay in this.SendChunk(resBodyIterator.Current))
									yield return relay;
							}
							while (resBodyIterator.MoveNext());

							foreach (int relay in this.SendLine("0")
								.Concat(this.Channel.Send(CRLF)))
								yield return relay;
						}
						else
						{
							foreach (int relay in this.SendLine("Content-Length: " + first.Length)
								.Concat(this.EndHeader())
								.Concat(this.Channel.Send(first)))
								yield return relay;
						}
					}
					else
					{
						foreach (int relay in this.SendLine("Content-Length: 0")
							.Concat(this.EndHeader()))
							yield return relay;
					}
				}
			}

			private IEnumerable<int> EndHeader()
			{
				foreach (int relay in this.SendLine("Connection: " + (this.KeepAlive ? "keep-alive" : "close"))
					.Concat(this.Channel.Send(CRLF)))
					yield return relay;
			}

			private IEnumerable<int> SendChunk(byte[] chunk)
			{
				if (1 <= chunk.Length)
				{
					foreach (int relay in this.SendLine(chunk.Length.ToString("x"))
						.Concat(this.Channel.Send(chunk))
						.Concat(this.Channel.Send(CRLF)))
						yield return relay;
				}
			}

			private IEnumerable<int> SendLine(string line)
			{
				foreach (int relay in this.Channel.Send(Encoding.ASCII.GetBytes(line))
					.Concat(this.Channel.Send(CRLF)))
					yield return relay;
			}
		}

		private class HTTPBodyOutputStream : IDisposable
		{
#if true
			public void Write(byte[] data)
			{
				throw new Exception("Request-Body is not supported");
			}

			public int Count
			{
				get
				{
					return 0;
				}
			}

			public byte[] ToByteArray()
			{
				return new byte[0];
			}

			public void Dispose()
			{
				// noop
			}
#else
			private static string TMP_Dir = null;
			private string BuffFile;
			private int Size = 0;

			public HTTPBodyOutputStream()
			{
				if (TMP_Dir == null)
				{
					string dir = Environment.GetEnvironmentVariable("TMP");

					if (string.IsNullOrEmpty(dir))
						throw new Exception("TMP is empty");

					if (!Directory.Exists(dir))
						throw new Exception("TMP does not exists");

					TMP_Dir = dir;
				}
				this.BuffFile = Path.Combine(TMP_Dir, $"SimpleWebServer_{Guid.NewGuid().ToString()}.tmp");
				File.WriteAllBytes(this.BuffFile, new byte[0]);
			}

			public void Write(byte[] data)
			{
				using (FileStream writer = new FileStream(this.BuffFile, FileMode.Append, FileAccess.Write))
				{
					writer.Write(data, 0, data.Length);
				}
				this.Size += data.Length;
			}

			public int Count
			{
				get
				{
					return this.Size;
				}
			}

			public byte[] ToByteArray()
			{
				byte[] data = File.ReadAllBytes(this.BuffFile);

				File.WriteAllBytes(this.BuffFile, new byte[0]);
				this.Size = 0;

				return data;
			}

			public void Dispose()
			{
				if (this.BuffFile != null)
				{
					try
					{
						File.Delete(this.BuffFile);
					}
					catch
					{ }

					this.BuffFile = null;
				}
			}
#endif
		}

		private abstract class SockServer
		{
			/// <summary>
			/// サーバーロジック
			/// 通信量:
			/// -- 0 == 通信終了 -- Supplier の最後の要素の次以降 0 (default(int)) になるため
			/// -- 0 未満 == 通信無し
			/// -- 1 以上 == 通信有り
			/// </summary>
			/// <param name="channel">接続チャネル</param>
			/// <returns>通信量</returns>
			protected abstract IEnumerable<int> E_Connected(SockChannel channel);

			private List<SockChannel> Channels = new List<SockChannel>();

			public void Perform(int portNo, Func<bool> interlude)
			{
				WriteLog("SERVER STARTING...");

				try
				{
					using (Socket listener = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp))
					{
						IPEndPoint endPoint = new IPEndPoint(0L, portNo);

						try
						{
							listener.Bind(endPoint);
						}
						catch (Exception e)
						{
							throw new Exception("バインドに失敗しました。指定されたポート番号は使用中です。", e);
						}
						listener.Listen(Backlog);
						listener.Blocking = false;

						WriteLog("SERVER STARTED!");

						int waitMillis = 0;

						while (interlude())
						{
							if (waitMillis < 100)
								waitMillis++;

							for (int c = 0; c < 30; c++) // HACK: 繰り返し回数_適当
							{
								Socket handler = this.Channels.Count < ConnectMax ? this.Connect(listener) : null;

								if (handler == null) // ? 接続無し || 最大同時接続数に達している。
									break;

								waitMillis = 0; // reset

								TimeWaitMonitor.Connected();

								{
									SockChannel channel = new SockChannel();

									channel.Handler = handler;
									handler = null; // もう使わない。
									channel.Handler.Blocking = false;
									channel.ID = IDIssuer.Issue();
									channel.Connected = Supplier(this.E_Connected(channel));
									channel.BodyOutputStream = new HTTPBodyOutputStream();

									this.Channels.Add(channel);

									WriteLog("CONN-ST " + channel.ID);
								}
							}
							for (int index = this.Channels.Count - 1; 0 <= index; index--)
							{
								SockChannel channel = this.Channels[index];
								int size;

								try
								{
									size = channel.Connected();

									if (0 < size) // ? 通信有り
									{
										waitMillis = 0; // reset
									}
								}
								catch (Exception e)
								{
									WriteLog(e);
									size = 0;
								}

								if (size == 0) // ? 切断
								{
									WriteLog("CONN-ED " + channel.ID);

									this.Disconnect(channel);
									this.Channels[index] = this.Channels[this.Channels.Count - 1];
									this.Channels.RemoveAt(this.Channels.Count - 1);

									TimeWaitMonitor.Disconnect();
								}
							}

							if (0 < waitMillis)
								Thread.Sleep(waitMillis);
						}

						WriteLog("SERVER ENDING...");

						this.Stop();
					}
				}
				catch (Exception e)
				{
					WriteLog(e);
				}

				WriteLog("SERVER ENDED!");
			}

			private Socket Connect(Socket listener) // ret: null == 接続タイムアウト
			{
				try
				{
					return listener.Accept();
				}
				catch (SocketException e)
				{
					if (e.ErrorCode != 10035)
					{
						throw new Exception("Connection error", e);
					}
					return null;
				}
			}

			private void Stop()
			{
				foreach (SockChannel channel in this.Channels)
					this.Disconnect(channel);

				this.Channels.Clear();
			}

			private void Disconnect(SockChannel channel)
			{
				try
				{
					channel.Handler.Shutdown(SocketShutdown.Both);
				}
				catch (Exception e)
				{
					WriteLog(e);
				}

				try
				{
					channel.Handler.Close();
				}
				catch (Exception e)
				{
					WriteLog(e);
				}

				channel.BodyOutputStream.Dispose();

				IDIssuer.Discard(channel.ID);
			}
		}

		private class SockChannel
		{
			public Socket Handler;
			public int ID;
			public Func<int> Connected;
			public HTTPBodyOutputStream BodyOutputStream;

			/// <summary>
			/// セッションタイムアウト日時
			/// null == INFINITE
			/// </summary>
			public DateTime? SessionTimeoutTime = null;

			/// <summary>
			/// スレッド占用タイムアウト日時
			/// null == リセット状態
			/// </summary>
			public DateTime? ThreadTimeoutTime = null;

			/// <summary>
			/// 無通信タイムアウト_ミリ秒
			/// -1 == INFINITE
			/// </summary>
			public int P_IdleTimeoutMillis = -1;

			private IEnumerable<int> PreRecvSend()
			{
				if (this.SessionTimeoutTime != null && this.SessionTimeoutTime.Value < DateTime.Now)
				{
					throw new Exception("Session time-out");
				}
				if (this.ThreadTimeoutTime == null)
				{
					if (ThreadTimeoutMillis != -1)
						this.ThreadTimeoutTime = DateTime.Now + TimeSpan.FromMilliseconds((double)ThreadTimeoutMillis);
				}
				else if (this.ThreadTimeoutTime.Value < DateTime.Now)
				{
					WriteLog("Thread time-out");

					this.ThreadTimeoutTime = null;
					yield return -1;
				}
			}

			public IEnumerable<int> Recv(int size, Action<byte[]> a_return)
			{
				byte[] data = new byte[size];
				int offset = 0;

				while (1 <= size)
				{
					int? recvSize = null;

					foreach (int relay in this.TryRecv(data, offset, size, ret => recvSize = ret))
						yield return relay;

					size -= recvSize.Value;
					offset += recvSize.Value;
				}
				a_return(data);
			}

			public IEnumerable<int> TryRecv(byte[] data, int offset, int size, Action<int> a_return)
			{
				DateTime startedTime = DateTime.Now;

				for (; ; )
				{
					foreach (int relay in this.PreRecvSend())
						yield return relay;

					try
					{
						int recvSize = this.Handler.Receive(data, offset, size, SocketFlags.None);

						if (recvSize <= 0)
						{
							throw new Exception("Receive error (disconnect)");
						}
						if (10.0 <= (DateTime.Now - startedTime).TotalSeconds) // 長い無通信時間をモニタする。
						{
							WriteLog("IDLE-RECV " + (DateTime.Now - startedTime).TotalSeconds.ToString("F3"));
						}
						a_return(recvSize);
						break;
					}
					catch (SocketException e)
					{
						if (e.ErrorCode != 10035)
						{
							throw new Exception("Receive error", e);
						}
					}
					if (this.P_IdleTimeoutMillis != -1 && this.P_IdleTimeoutMillis < (DateTime.Now - startedTime).TotalMilliseconds)
					{
						throw new Exception("Receive error (idle time-out)");
					}
					this.ThreadTimeoutTime = null;
					yield return -1;
				}
				yield return 1;
			}

			public IEnumerable<int> Send(byte[] data)
			{
				int offset = 0;
				int size = data.Length;

				while (1 <= size)
				{
					int? sentSize = null;

					foreach (int relay in this.TrySend(data, offset, Math.Min(4 * 1024 * 1024, size), ret => sentSize = ret))
						yield return relay;

					size -= sentSize.Value;
					offset += sentSize.Value;
				}
			}

			private IEnumerable<int> TrySend(byte[] data, int offset, int size, Action<int> a_return)
			{
				DateTime startedTime = DateTime.Now;

				for (; ; )
				{
					foreach (int relay in this.PreRecvSend())
						yield return relay;

					try
					{
						int sentSize = this.Handler.Send(data, offset, size, SocketFlags.None);

						if (sentSize <= 0)
						{
							throw new Exception("Send error (disconnect)");
						}
						if (10.0 <= (DateTime.Now - startedTime).TotalSeconds) // 長い無通信時間をモニタする。
						{
							WriteLog("IDLE-SEND " + (DateTime.Now - startedTime).TotalSeconds.ToString("F3"));
						}
						a_return(sentSize);
						break;
					}
					catch (SocketException e)
					{
						if (e.ErrorCode != 10035)
						{
							throw new Exception("Send error", e);
						}
					}
					if (this.P_IdleTimeoutMillis != -1 && this.P_IdleTimeoutMillis < (DateTime.Now - startedTime).TotalMilliseconds)
					{
						throw new Exception("Send error (idle time-out)");
					}
					this.ThreadTimeoutTime = null;
					yield return -1;
				}
				yield return 1;
			}
		}

		private static UTF8Check P_UTF8Check = new UTF8Check();

		private class UTF8Check
		{
			private object[] Home = CreateByteCodeBranchTable();

			public UTF8Check()
			{
				for (byte chr = 0x20; chr <= 0x7e; chr++) // ASCII
					this.Add(new byte[] { chr });

				for (byte chr = 0xa1; chr <= 0xdf; chr++) // 半角カナ
					this.Add(Encoding.UTF8.GetBytes(new string(new char[] { SJISHanKanaToUnicode(chr) })));

				foreach (char chr in GetUnicodeListOfSJISMBC()) // 2バイト文字
					this.Add(Encoding.UTF8.GetBytes(new string(new char[] { chr })));
			}

			private void Add(byte[] bytes)
			{
				if (bytes.Length < 1)
					throw null; // never

				object[] curr = this.Home;

				foreach (byte bChr in bytes.Take(bytes.Length - 1))
				{
					int index = (int)bChr;

					if (curr[index] == null)
						curr[index] = CreateByteCodeBranchTable();

					curr = (object[])curr[index];

					if (curr == this.Home)
						throw null; // never
				}

				{
					int index = (int)bytes[bytes.Length - 1];

					if (curr[index] != null)
						if (curr[index] != this.Home) // 同じ文字が追加されることがある。
							throw null; // never

					curr[index] = this.Home;
				}
			}

			private static object[] CreateByteCodeBranchTable()
			{
				return new object[256];
			}

			public bool Check(byte[] bytes)
			{
				object[] curr = this.Home;

				foreach (byte bChr in bytes)
				{
					curr = (object[])curr[(int)bChr];

					if (curr == null)
						return false;
				}
				return curr == this.Home;
			}
		}

		private static class IDIssuer
		{
			private static Queue<int> Stocks = new Queue<int>(Enumerable.Range(1, 9));
			private static int Counter = 10;

			public static int Issue()
			{
				if (Stocks.Count == 0)
					Stocks.Enqueue(Counter++);

				return Stocks.Dequeue();
			}

			public static void Discard(int id)
			{
				Stocks.Enqueue(id);
			}
		}

		private static class TimeWaitMonitor
		{
			// 参考値:
			// 動的ポートの数 16384 (49152 ~ 65535), TIME_WAIT-タイムアウト 4 min (240 sec) の場合 (Windowsの既定値)
			// CTR_ROT_SEC = 60
			// COUNTER_NUM = 5       -- 直近 4 ~ 5 分間の切断回数を保持
			// COUNT_LIMIT = 10000   -- 50 ミリ秒間隔で接続&切断し続けた場合 4 分間に 4800 回 --> TIME_WAIT 数 14800 (COUNT_LIMIT + 4800) を超えない。
			// - - -
			// 動的ポートの数 64511 (1025 ~ 65535), TIME_WAIT-タイムアウト 1 min (60 sec) の場合 (動的ポート最大)
			// CTR_ROT_SEC = 30
			// COUNTER_NUM = 3       -- 直近 1 ~ 1.5 分間の切断回数を保持
			// COUNT_LIMIT = 60000   -- 50 ミリ秒間隔で接続&切断し続けた場合 1 分間に 1200 回 --> TIME_WAIT 数 61200 (COUNT_LIMIT + 1200) を超えない。

			private const int CTR_ROT_SEC = 60;
			private const int COUNTER_NUM = 5;
			private const int COUNT_LIMIT = 10000;

			private static int ConnectedCount = 0;
			private static int[] TWCounters = new int[COUNTER_NUM]; // 直近数分間に発生した切断(TIME_WAIT)の回数
			private static int TWCounterIndex = 0;
			private static DateTime NextRotateTime = GetNextRotateTime();

			public static void Connected()
			{
				KickCounter(1, 0);

				if (COUNT_LIMIT < ConnectedCount + TWCounters.Sum()) // ? TIME_WAIT 多すぎ -> 時間当たりの接続数を制限する。-- TIME_WAIT を減らす。
				{
					WriteLog("PORT-EXHAUSTION");

					Thread.Sleep(50); // HACK: 送受信も止める。
				}
			}

			public static void Disconnect()
			{
				KickCounter(-1, 1);
			}

			private static void KickCounter(int connAdd, int twAdd)
			{
				ConnectedCount += connAdd;

				if (NextRotateTime < DateTime.Now)
				{
					TWCounterIndex++;
					TWCounterIndex %= TWCounters.Length;
					TWCounters[TWCounterIndex] = twAdd;
					NextRotateTime = GetNextRotateTime();
				}
				else
					TWCounters[TWCounterIndex] += twAdd;

				WriteLog($"TIME-WAIT-MONITOR: {twAdd}, {ConnectedCount} + {TWCounters.Sum()} = {ConnectedCount + TWCounters.Sum()}");
			}

			private static DateTime GetNextRotateTime()
			{
				return DateTime.Now + TimeSpan.FromSeconds((double)CTR_ROT_SEC);
			}
		}

		#region ToFairLocalPath

		/// <summary>
		/// Windowsのローカル名に使用出来ない予約名のリストを返す。
		/// 今では使用可能なものも含む。
		/// 元にしたコード:
		/// https://github.com/stackprobe/Factory/blob/master/Common/DataConv.c#L460-L491
		/// </summary>
		/// <returns>予約名リスト</returns>
		private static IEnumerable<string> GetReservedWordsForWindowsPath()
		{
			yield return "AUX";
			yield return "CON";
			yield return "NUL";
			yield return "PRN";

			for (int no = 1; no <= 9; no++)
			{
				yield return "COM" + no;
				yield return "LPT" + no;
			}

			// グレーゾーン
			{
				yield return "COM0";
				yield return "LPT0";
				yield return "CLOCK$";
				yield return "CONFIG$";
			}
		}

		/// <summary>
		/// 歴としたローカル名に変換する。
		/// 実際に使用可能なローカル名より基準が厳しい。
		/// 元にしたコード:
		/// https://github.com/stackprobe/Factory/blob/master/Common/DataConv.c#L503-L552
		/// </summary>
		/// <param name="str">対象文字列(対象パス)</param>
		/// <param name="dirSize">対象パスが存在するディレクトリのフルパスの長さ、考慮しない場合は 0 を指定すること。</param>
		/// <returns>ローカル名</returns>
		private static string ToFairLocalPath(string str, int dirSize)
		{
			const int MY_PATH_MAX = 250;
			const string NG_CHARS = "\"*/:<>?\\|";
			const string ALT_WORD = "_";

			int localPathSizeMax = Math.Max(0, MY_PATH_MAX - dirSize);

			if (localPathSizeMax < str.Length) // HACK: 元にしたコードではバイト列の長さで判定している。
				str = str.Substring(0, localPathSizeMax);

			//str = ToJString(str);

			string[] words = str.Split('.');

			for (int index = 0; index < words.Length; index++)
			{
				string word = words[index];

				word = word.Trim();

				if (
					index == 0 &&
					GetReservedWordsForWindowsPath().Any(resWord => EqualsIgnoreCase(resWord, word)) ||
					word.Any(chr => NG_CHARS.IndexOf(chr) != -1)
					)
					word = ALT_WORD;

				words[index] = word;
			}
			str = string.Join(".", words);

			if (str == "")
				str = ALT_WORD;

			if (str.EndsWith("."))
				str = str.Substring(0, str.Length - 1) + ALT_WORD;

			return str;
		}

		#endregion

		private static void WriteLog(object message)
		{
			if (message is Exception)
				message = ((Exception)message).Message;

			Console.WriteLine("[" + DateTime.Now + "] " + message);
		}

		private static Dictionary<string, V> CreateDictionaryIgnoreCase<V>()
		{
			return new Dictionary<string, V>(new IECompStringIgnoreCase());
		}

		private static Func<T> Supplier<T>(IEnumerable<T> src)
		{
			IEnumerator<T> reader = src.GetEnumerator();

			return () =>
			{
				if (reader != null)
				{
					if (reader.MoveNext())
						return reader.Current;

					reader.Dispose();
					reader = null;
				}
				return default(T);
			};
		}

		private class IECompStringIgnoreCase : IEqualityComparer<string>
		{
			public bool Equals(string a, string b)
			{
				return a.ToLower() == b.ToLower();
			}

			public int GetHashCode(string a)
			{
				return a.ToLower().GetHashCode();
			}
		}

		private static bool EqualsIgnoreCase(string a, string b)
		{
			return a.ToLower() == b.ToLower();
		}

		private static bool ContainsIgnoreCase(string str, string ptn)
		{
			return str.ToLower().Contains(ptn.ToLower());
		}

		private static char SJISHanKanaToUnicode(byte chr)
		{
			return (char)((int)chr + 65216);
		}

#if true
		private static IEnumerable<char> GetUnicodeListOfSJISMBC()
		{
			#region RANGES_RESOURCE

			string RANGES_RESOURCE = @"

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9e819e819e889e889e8b9e8c9e919e939e959e959e979e979e9d9e9d9e9f9e9f9ea59ea69ea99eaa9ead9ead9eb89ebc9ebe9ebf9ec49ec49ecc9ed29ed49ed4
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9f3b9f3b9f3e9f3e9f4a9f4b9f4e9f4f9f529f529f549f549f5f9f639f669f679f6a9f6a9f6c9f6c9f729f729f769f779f8d9f8d9f959f959f9c9f9d9fa09fa0
f929f929f9dcf9dcfa0efa2dff01ff5effe0ffe5

";

			#endregion

			RANGES_RESOURCE = new string(RANGES_RESOURCE.Where(chr => ' ' <= chr).ToArray());

			for (int index = 0; index < RANGES_RESOURCE.Length; index += 8)
			{
				char chrMin = (char)Convert.ToInt32(RANGES_RESOURCE.Substring(index + 0, 4), 16);
				char chrMax = (char)Convert.ToInt32(RANGES_RESOURCE.Substring(index + 4, 4), 16);

				for (char chr = chrMin; chr <= chrMax; chr++)
				{
					yield return chr;
				}
			}
		}
#else
		private static IEnumerable<char> GetUnicodeListOfSJISMBC()
		{
			return P_GetUnicodeListOfSJISMBC().OrderBy(v => v).Distinct();
		}

		private static IEnumerable<char> P_GetUnicodeListOfSJISMBC()
		{
		#region RANGES_RESOURCE

			string RANGES_RESOURCE = @"
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";

		#endregion

			RANGES_RESOURCE = new string(RANGES_RESOURCE.Where(chr => ' ' <= chr).ToArray());

			//Encoding.RegisterProvider(CodePagesEncodingProvider.Instance); // for .NET Core
			Encoding SJIS = Encoding.GetEncoding(932);

			for (int index = 0; index < RANGES_RESOURCE.Length; index += 8)
			{
				int chrMin = Convert.ToInt32(RANGES_RESOURCE.Substring(index + 0, 4), 16);
				int chrMax = Convert.ToInt32(RANGES_RESOURCE.Substring(index + 4, 4), 16);

				for (int chr = chrMin; chr <= chrMax; chr++)
				{
					yield return SJIS.GetString(new byte[] { (byte)(chr >> 8), (byte)(chr & 0xff) })[0];
				}
			}
		}
#endif
	}
}

 
補足
クライアントが送信したURLはほぼ任意のバイト列であり、これをそのまま string.UTF8.GetString したり File.Exists, Directory.Exists したりするのは何かを踏み抜く気がするため US-ASCII + Shift_JIS(CP-932?) に存在する文字以外は例外を投げるようにしている。これが必要な処置なのかどうかは分からない。要らないということであれば if (!P_UTF8Check.Check(bytes)) throw new Exception("URL is not Japanese UTF-8"); を削除できるので、関連するメソッドも削除すればコード量は相当減るだろう。
同様に ToFairLocalPath も不要であれば削除されたし。NUL, PRN などのトラブルの元になるファイル名を弾くための大昔に作ったメソッドで、今だに使い続けている。今では問題無いファイル名も弾いているかもしれない。ていうか弾いてる。
- -
Hatena/SimpleWebServer.cs at main · soleil-taruto/Hatena · GitHub