.NET实现HTTP协议中的GET、POST请求

这个代码网上找，觉得不错，放到这里和大家分享，非常有用。

 

  1using System;
  2using System.Collections.Generic;
  3using System.Text;
  4using System.Net;
  5using System.Net.Sockets;
  6using System.Collections;
  7using System.IO;
  8using System.Text.RegularExpressions;
  9using RE = System.Text.RegularExpressions.Regex;
 10using System.Security.Cryptography.X509Certificates;
 11
 12/**//***************************************************************************************************************************************************
 13 * *文件名：HttpProc.cs
 14 * *创建人：HeDaode
 15 * *日 期：2007.09.01
 16 * *描 述：实现HTTP协议中的GET、POST请求
 17 * *使 用：HttpProc.WebClient client = new HttpProc.WebClient();
 18            client.Encoding = System.Text.Encoding.Default;//默认编码方式，根据需要设置其他类型
 19            client.OpenRead("http://www.baidu.com");//普通get请求
 20            MessageBox.Show(client.RespHtml);//获取返回的网页源代码
 21            client.DownloadFile("http://www.loopc.com/upload/163album.rar",@"C:\163album.rar");//下载文件
 22            client.OpenRead("http://passport.baidu.com/?login","username=zhangsan&password=123456");//提交表单，此处是登录百度的示例
 23            client.UploadFile("http://hiup.baidu.com/zhangsan/upload", @"file1=D:\1.mp3");//上传文件
 24            client.UploadFile("http://hiup.baidu.com/zhangsan/upload", "folder=myfolder&size=4003550",@"file1=D:\1.mp3");//提交含文本域和文件域的表单
 25*****************************************************************************************************************************************************/
 26
 27namespace HttpProc
 28{
 29    /**////<summary>
 30    ///上传事件委托
 31    ///</summary>
 32    ///<param name="sender"></param>
 33    ///<param name="e"></param>
 34    public delegate void WebClientUploadEvent(object sender, HttpProc.UploadEventArgs e);
 35
 36    /**////<summary>
 37    ///下载事件委托
 38    ///</summary>
 39    ///<param name="sender"></param>
 40    ///<param name="e"></param>
 41    public delegate void WebClientDownloadEvent(object sender, HttpProc.DownloadEventArgs e);
 42
 43
 44    /**////<summary>
 45    ///上传事件参数
 46    ///</summary>
 47    public struct UploadEventArgs
 48    {
 49        /**////<summary>
 50        ///上传数据总大小
 51        ///</summary>
 52        public long totalBytes;
 53        /**////<summary>
 54        ///已发数据大小
 55        ///</summary>
 56        public long bytesSent;
 57        /**////<summary>
 58        ///发送进度(0-1)
 59        ///</summary>
 60        public double sendProgress;
 61        /**////<summary>
 62        ///发送速度Bytes/s
 63        ///</summary>
 64        public double sendSpeed;
 65    }
 66
 67    /**////<summary>
 68    ///下载事件参数
 69    ///</summary>
 70    public struct DownloadEventArgs
 71    {
 72        /**////<summary>
 73        ///下载数据总大小
 74        ///</summary>
 75        public long totalBytes;
 76        /**////<summary>
 77        ///已接收数据大小
 78        ///</summary>
 79        public long bytesReceived;
 80        /**////<summary>
 81        ///接收数据进度(0-1)
 82        ///</summary>
 83        public double ReceiveProgress;
 84        /**////<summary>
 85        ///当前缓冲区数据
 86        ///</summary>
 87        public byte[] receivedBuffer;
 88        /**////<summary>
 89        ///接收速度Bytes/s
 90        ///</summary>
 91        public double receiveSpeed;
 92    }
 93
 94    /**////<summary>
 95    ///实现向WEB服务器发送和接收数据
 96    ///</summary>
 97    public class WebClient
 98    {
 99        private WebHeaderCollection requestHeaders, responseHeaders;
100        private TcpClient clientSocket;
101        private MemoryStream postStream;
102        private Encoding encoding = Encoding.Default;
103        private const string BOUNDARY = "--HEDAODE--";
104        private const int SEND_BUFFER_SIZE = 10245;
105        private const int RECEIVE_BUFFER_SIZE = 10245;
106        private string cookie = "";
107        private string respHtml = "";
108        private string strRequestHeaders = "";
109        private string strResponseHeaders = "";
110        private int statusCode = 0;
111        private bool isCanceled = false;
112        public event WebClientUploadEvent UploadProgressChanged;
113        public event WebClientDownloadEvent DownloadProgressChanged;
114
115        /**////<summary>
116        ///初始化WebClient类
117        ///</summary>
118        public WebClient()
119        {
120            responseHeaders = new WebHeaderCollection();
121            requestHeaders = new WebHeaderCollection();
122        }
123
124
125        /**////<summary>
126        ///读取指定URL的文本
127        ///</summary>
128        ///<param name="URL">请求的地址</param>
129        ///<returns>服务器响应文本</returns>
130        public string OpenRead(string URL)
131        {
132            requestHeaders.Add("Connection", "close");
133            SendRequestData(URL, "GET");
134            return GetHtml();
135        }
136
137
138        //解决证书过期无法访问的问题
139        class CertPolicy : ICertificatePolicy
140        {
141            public bool CheckValidationResult(ServicePoint srvpt, X509Certificate cert, WebRequest req, int certprb)
142            { return true; }
143        }
144
145        /**////<summary>
146        ///采用https协议访问网络
147        ///</summary>
148        ///<param name="URL">url地址</param>
149        ///<param name="strPostdata">发送的数据</param>
150        ///<returns></returns>
151        public string OpenReadWithHttps(string URL, string strPostdata)
152        {
153            ServicePointManager.CertificatePolicy = new CertPolicy();
154            HttpWebRequest request = (HttpWebRequest)WebRequest.Create(URL);
155            request.CookieContainer = new CookieContainer();
156            request.Method = "POST";
157            request.Accept = "*/*";
158            request.ContentType = "application/x-www-form-urlencoded";
159            byte[] buffer = this.encoding.GetBytes(strPostdata);
160            request.ContentLength = buffer.Length;
161            request.GetRequestStream().Write(buffer, 0, buffer.Length);
162            HttpWebResponse response = (HttpWebResponse)request.GetResponse();
163            StreamReader reader = new StreamReader(response.GetResponseStream(), encoding);
164            this.respHtml = reader.ReadToEnd();
165            foreach (System.Net.Cookie ck in response.Cookies)
166            {
167                this.cookie += ck.Name + "=" + ck.Value + ";";
168            }
169            reader.Close();
170            return respHtml;
171        }
172
173        /**////<summary>
174        ///读取指定URL的文本
175        ///</summary>
176        ///<param name="URL">请求的地址</param>
177        ///<param name="postData">向服务器发送的文本数据</param>
178        ///<returns>服务器响应文本</returns>
179        public string OpenRead(string URL, string postData)
180        {
181            byte[] sendBytes = encoding.GetBytes(postData);
182            postStream = new MemoryStream();
183            postStream.Write(sendBytes, 0, sendBytes.Length);
184
185            requestHeaders.Add("Content-Length", postStream.Length.ToString());
186            requestHeaders.Add("Content-Type", "application/x-www-form-urlencoded");
187            requestHeaders.Add("Connection", "close");
188
189            SendRequestData(URL, "POST");
190            return GetHtml();
191        }
192
193
194        /**////<summary>
195        ///读取指定URL的流
196        ///</summary>
197        ///<param name="URL">请求的地址</param>
198        ///<param name="postData">向服务器发送的数据</param>
199        ///<returns>服务器响应流</returns>
200        public Stream GetStream(string URL, string postData)
201        {
202            byte[] sendBytes = encoding.GetBytes(postData);
203            postStream = new MemoryStream();
204            postStream.Write(sendBytes, 0, sendBytes.Length);
205
206            requestHeaders.Add("Content-Length", postStream.Length.ToString());
207            requestHeaders.Add("Content-Type", "application/x-www-form-urlencoded");
208            requestHeaders.Add("Connection", "close");
209
210            SendRequestData(URL, "POST");
211
212            MemoryStream ms = new MemoryStream();
213            SaveNetworkStream(ms);
214            return ms;
215        }
216
217
218        /**////<summary>
219        ///上传文件到服务器
220        ///</summary>
221        ///<param name="URL">请求的地址</param>
222        ///<param name="fileField">文件域(格式如:file1=C:\test.mp3&file2=C:\test.jpg)</param>
223        ///<returns>服务器响应文本</returns>
224        public string UploadFile(string URL, string fileField)
225        {
226            return UploadFile(URL, "", fileField);
227        }
228
229        /**////<summary>
230        ///上传文件和数据到服务器
231        ///</summary>
232        ///<param name="URL">请求地址</param>
233        ///<param name="textField">文本域(格式为:name1=value1&name2=value2)</param>
234        ///<param name="fileField">文件域(格式如:file1=C:\test.mp3&file2=C:\test.jpg)</param>
235        ///<returns>服务器响应文本</returns>
236        public string UploadFile(string URL, string textField, string fileField)
237        {
238            postStream = new MemoryStream();
239
240            if (textField != "" && fileField != "")
241            {
242                WriteTextField(textField);
243                WriteFileField(fileField);
244            }
245            else if (fileField != "")
246            {
247                WriteFileField(fileField);
248            }
249            else if (textField != "")
250            {
251                WriteTextField(textField);
252            }
253            else
254                throw new Exception("文本域和文件域不能同时为空。");
255
256            //写入结束标记
257            byte[] buffer = encoding.GetBytes("--" + BOUNDARY + "--\r\n");
258            postStream.Write(buffer, 0, buffer.Length);
259
260            //添加请求标头
261            requestHeaders.Add("Content-Length", postStream.Length.ToString());
262            requestHeaders.Add("Content-Type", "multipart/form-data; boundary=" + BOUNDARY);
263            requestHeaders.Add("Connection", "Keep-Alive");
264
265            //发送请求数据
266            SendRequestData(URL, "POST", true);
267
268            //返回响应文本
269            return GetHtml();
270        }
271
272
273        /**////<summary>
274        ///分析文本域，添加到请求流
275        ///</summary>
276        ///<param name="textField">文本域</param>
277        private void WriteTextField(string textField)
278        {
279            string[] strArr = RE.Split(textField, "&");
280            textField = "";
281            foreach (string var in strArr)
282            {
283                Match M = RE.Match(var, "([^=]+)=(.+)");
284                textField += "--" + BOUNDARY + "\r\n";
285                textField += "Content-Disposition: form-data; name=\"" + M.Groups[1].Value + "\"\r\n\r\n" + M.Groups[2].Value + "\r\n";
286            }
287            byte[] buffer = encoding.GetBytes(textField);
288            postStream.Write(buffer, 0, buffer.Length);
289        }
290
291        /**////<summary>
292        ///分析文件域，添加到请求流
293        ///</summary>
294        ///<param name="fileField">文件域</param>
295        private void WriteFileField(string fileField)
296        {
297            string filePath = "";
298            int count = 0;
299            string[] strArr = RE.Split(fileField, "&");
300            foreach (string var in strArr)
301            {
302                Match M = RE.Match(var, "([^=]+)=(.+)");
303                filePath = M.Groups[2].Value;
304                fileField = "--" + BOUNDARY + "\r\n";
305                fileField += "Content-Disposition: form-data; name=\"" + M.Groups[1].Value + "\"; filename=\"" + Path.GetFileName(filePath) + "\"\r\n";
306                fileField += "Content-Type: image/jpeg\r\n\r\n";
307 
308                byte[] buffer = encoding.GetBytes(fileField);
309                postStream.Write(buffer, 0, buffer.Length);
310 
311                //添加文件数据
312                FileStream fs = new FileStream(filePath, FileMode.Open, FileAccess.Read);
313                buffer = new byte[50000];
314 
315                do
316                {
317                    count = fs.Read(buffer, 0, buffer.Length);
318                    postStream.Write(buffer, 0, count);
319 
320                } while (count > 0);
321 
322                fs.Close();
323                fs.Dispose();
324                fs = null;
325 
326                buffer = encoding.GetBytes("\r\n");
327                postStream.Write(buffer, 0, buffer.Length);
328            }
329        }
330
331        /**////<summary>
332        ///从指定URL下载数据流
333        ///</summary>
334        ///<param name="URL">请求地址</param>
335        ///<returns>数据流</returns>
336        public Stream DownloadData(string URL)
337        {
338            requestHeaders.Add("Connection", "close");
339            SendRequestData(URL, "GET");
340            MemoryStream ms = new MemoryStream();
341            SaveNetworkStream(ms, true);
342            return ms;
343        }
344
345
346        /**////<summary>
347        ///从指定URL下载文件
348        ///</summary>
349        ///<param name="URL">文件URL地址</param>
350        ///<param name="fileName">文件保存路径,含文件名(如:C:\test.jpg)</param>
351        public void DownloadFile(string URL, string fileName)
352        {
353            requestHeaders.Add("Connection", "close");
354            SendRequestData(URL, "GET");
355            FileStream fs = new FileStream(fileName, FileMode.Create);
356            SaveNetworkStream(fs, true);
357            fs.Close();
358            fs = null;
359        }
360
361        /**////<summary>
362        ///向服务器发送请求
363        ///</summary>
364        ///<param name="URL">请求地址</param>
365        ///<param name="method">POST或GET</param>
366        ///<param name="showProgress">是否显示上传进度</param>
367        private void SendRequestData(string URL, string method, bool showProgress)
368        {
369            clientSocket = new TcpClient();
370            Uri URI = new Uri(URL);
371            clientSocket.Connect(URI.Host, URI.Port);
372
373            requestHeaders.Add("Host", URI.Host);
374            byte[] request = GetRequestHeaders(method + " " + URI.PathAndQuery + " HTTP/1.1");
375            clientSocket.Client.Send(request);
376
377            //若有实体内容就发送它
378            if (postStream != null)
379            {
380                byte[] buffer = new byte[SEND_BUFFER_SIZE];
381                int count = 0;
382                Stream sm = clientSocket.GetStream();
383                postStream.Position = 0;
384
385                UploadEventArgs e = new UploadEventArgs();
386                e.totalBytes = postStream.Length;
387                System.Diagnostics.Stopwatch timer = new System.Diagnostics.Stopwatch();//计时器
388                timer.Start();
389                do
390                {
391                    //如果取消就推出
392                    if (isCanceled) { break; }
393
394                    //读取要发送的数据
395                    count = postStream.Read(buffer, 0, buffer.Length);
396                    //发送到服务器
397                    sm.Write(buffer, 0, count);
398
399                    //是否显示进度
400                    if (showProgress)
401                    {
402                        //触发事件
403                        e.bytesSent += count;
404                        e.sendProgress = (double)e.bytesSent / (double)e.totalBytes;
405                        double t = timer.ElapsedMilliseconds / 1000;
406                        t = t <= 0 ? 1 : t;
407                        e.sendSpeed = (double)e.bytesSent / t;
408                        if (UploadProgressChanged != null) { UploadProgressChanged(this, e); }
409                    }
410
411                } while (count > 0);
412                timer.Stop();
413                postStream.Close();
414                //postStream.Dispose();
415                postStream = null;
416
417            }//end if
418
419        }
420
421        /**////<summary>
422        ///向服务器发送请求
423        ///</summary>
424        ///<param name="URL">请求URL地址</param>
425        ///<param name="method">POST或GET</param>
426        private void SendRequestData(string URL, string method)
427        {
428            SendRequestData(URL, method, false);
429        }
430
431
432        /**////<summary>
433        ///获取请求头字节数组
434        ///</summary>
435        ///<param name="request">POST或GET请求</param>
436        ///<returns>请求头字节数组</returns>
437        private byte[] GetRequestHeaders(string request)
438        {
439            requestHeaders.Add("Accept", "*/*");
440            requestHeaders.Add("Accept-Language", "zh-cn");
441            requestHeaders.Add("User-Agent", "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.2; SV1; .NET CLR 1.1.4322; .NET CLR 2.0.50727)");
442
443            string headers = request + "\r\n";
444
445            foreach (string key in requestHeaders)
446            {
447                headers += key + ":" + requestHeaders[key] + "\r\n";
448            }
449
450            //有Cookie就带上Cookie
451            if (cookie != "") { headers += "Cookie:" + cookie + "\r\n"; }
452
453            //空行，请求头结束
454            headers += "\r\n";
455
456            strRequestHeaders = headers;
457            requestHeaders.Clear();
458            return encoding.GetBytes(headers);
459        }
460
461
462
463        /**////<summary>
464        ///获取服务器响应文本
465        ///</summary>
466        ///<returns>服务器响应文本</returns>
467        private string GetHtml()
468        {
469            MemoryStream ms = new MemoryStream();
470            SaveNetworkStream(ms);//将网络流保存到内存流
471            StreamReader sr = new StreamReader(ms, encoding);
472            respHtml = sr.ReadToEnd();
473            sr.Close();
474            ms.Close();
475            return respHtml;
476        }
477
478        /**////<summary>
479        ///将网络流保存到指定流
480        ///</summary>
481        ///<param name="toStream">保存位置</param>
482        ///<param name="needProgress">是否显示进度</param>
483        private void SaveNetworkStream(Stream toStream, bool showProgress)
484        {
485            //获取要保存的网络流
486            NetworkStream NetStream = clientSocket.GetStream();
487
488            byte[] buffer = new byte[RECEIVE_BUFFER_SIZE];
489            int count = 0, startIndex = 0;
490
491            MemoryStream ms = new MemoryStream();
492            for (int i = 0; i < 3; i++)
493            {
494                count = NetStream.Read(buffer, 0, 500);
495                ms.Write(buffer, 0, count);
496            }
497
498            if (ms.Length == 0) { NetStream.Close(); throw new Exception("远程服务器没有响应"); }
499
500            buffer = ms.GetBuffer();
501            count = (int)ms.Length;
502
503            GetResponseHeader(buffer, out startIndex);//分析响应，获取响应头和响应实体
504            count -= startIndex;
505            toStream.Write(buffer, startIndex, count);
506
507            DownloadEventArgs e = new DownloadEventArgs();
508
509            if (responseHeaders["Content-Length"] != null)
510            { e.totalBytes = long.Parse(responseHeaders["Content-Length"]); }
511            else
512            { e.totalBytes = -1; }
513
514            //启动计时器
515            System.Diagnostics.Stopwatch timer = new System.Diagnostics.Stopwatch();
516            timer.Start();
517
518            do
519            {
520                //如果取消就推出
521                if (isCanceled) { break; }
522
523                //显示下载进度
524                if (showProgress)
525                {
526                    e.bytesReceived += count;
527                    e.ReceiveProgress = (double)e.bytesReceived / (double)e.totalBytes;
528
529                    byte[] tempBuffer = new byte[count];
530                    Array.Copy(buffer, startIndex, tempBuffer, 0, count);
531                    e.receivedBuffer = tempBuffer;
532
533                    double t = (timer.ElapsedMilliseconds + 0.1) / 1000;
534                    e.receiveSpeed = (double)e.bytesReceived / t;
535
536                    startIndex = 0;
537                    if (DownloadProgressChanged != null) { DownloadProgressChanged(this, e); }
538                }
539
540                //读取网路数据到缓冲区
541                count = NetStream.Read(buffer, 0, buffer.Length);
542
543                //将缓存区数据保存到指定流
544                toStream.Write(buffer, 0, count);
545            } while (count > 0);
546
547            timer.Stop();//关闭计时器
548
549            if (responseHeaders["Content-Length"] != null)
550            {
551                toStream.SetLength(long.Parse(responseHeaders["Content-Length"]));
552            }
553            //else
554            //{
555            //    toStream.SetLength(toStream.Length);
556            //    responseHeaders.Add("Content-Length", toStream.Length.ToString());//添加响应标头
557            //}
558
559            toStream.Position = 0;
560
561            //关闭网络流和网络连接
562            NetStream.Close();
563            clientSocket.Close();
564        }
565
566
567        /**////<summary>
568        ///将网络流保存到指定流
569        ///</summary>
570        ///<param name="toStream">保存位置</param>
571        private void SaveNetworkStream(Stream toStream)
572        {
573            SaveNetworkStream(toStream, false);
574        }
575
576
577
578        /**////<summary>
579        ///分析响应流，去掉响应头
580        ///</summary>
581        ///<param name="buffer"></param>
582        private void GetResponseHeader(byte[] buffer, out int startIndex)
583        {
584            responseHeaders.Clear();
585            string html = encoding.GetString(buffer);
586            StringReader sr = new StringReader(html);
587 
588            int start = html.IndexOf("\r\n\r\n") + 4;//找到空行位置
589            strResponseHeaders = html.Substring(0, start);//获取响应头文本
590 
591            //获取响应状态码
592            //
593            if (sr.Peek() > -1)
594            {
595                //读第一行字符串
596                string line = sr.ReadLine();
597 
598                //分析此行字符串,获取服务器响应状态码
599                Match M = RE.Match(line, @"\d\d\d");
600                if (M.Success)
601                {
602                    statusCode = int.Parse(M.Value);
603                }
604            }
605 
606            //获取响应头
607            //
608            while (sr.Peek() > -1)
609            {
610                //读一行字符串
611                string line = sr.ReadLine();
612 
613                //若非空行
614                if (line != "")
615           {
616                    //分析此行字符串，获取响应标头
617                    Match M = RE.Match(line, "([^:]+):(.+)");
618                    if (M.Success)
619                    {
620                        try
621                        {        //添加响应标头到集合
622                            responseHeaders.Add(M.Groups[1].Value.Trim(), M.Groups[2].Value.Trim());
623                        }
624                        catch
625                        { }
626 
627 
628                        //获取Cookie
629                        if (M.Groups[1].Value == "Set-Cookie")
630                        {
631                            M = RE.Match(M.Groups[2].Value, "[^=]+=[^;]+");
632                            cookie += M.Value.Trim() + ";";
633                        }
634                    }
635 
636                }
637                //若是空行，代表响应头结束响应实体开始。（响应头和响应实体间用一空行隔开）
638                else
639                {
640                    //如果响应头中没有实体大小标头，尝试读响应实体第一行获取实体大小
641                    if (responseHeaders["Content-Length"] == null && sr.Peek() > -1)
642                    {
643                        //读响应实体第一行
644                        line = sr.ReadLine();
645 
646                        //分析此行看是否包含实体大小
647                        Match M = RE.Match(line, "~[0-9a-fA-F]{1,15}");
648 
649                        if (M.Success)
650                        {
651                            //将16进制的实体大小字符串转换为10进制
652                            int length = int.Parse(M.Value, System.Globalization.NumberStyles.AllowHexSpecifier);
653                            responseHeaders.Add("Content-Length", length.ToString());//添加响应标头
654                            strResponseHeaders += M.Value + "\r\n";
655                        }
656                    }
657                    break;//跳出循环 
658                }//End If
659            }//End While
660 
661            sr.Close();
662 
663            //实体开始索引
664            startIndex = encoding.GetBytes(strResponseHeaders).Length;
665        }
666
667
668        /**////<summary>
669        ///取消上传或下载,要继续开始请调用Start方法
670        ///</summary>
671        public void Cancel()
672        {
673            isCanceled = true;
674        }
675
676        /**////<summary>
677        ///启动上传或下载，要取消请调用Cancel方法
678        ///</summary>
679        public void Start()
680        {
681            isCanceled = false;
682        }
683
684        //*************************************************************
685        //以下为属性
686        //*************************************************************
687
688        /**////<summary>
689        ///获取或设置请求头
690        ///</summary>
691        public WebHeaderCollection RequestHeaders
692        {
693            set { requestHeaders = value; }
694            get { return requestHeaders; }
695        }
696
697        /**////<summary>
698        ///获取响应头集合
699        ///</summary>
700        public WebHeaderCollection ResponseHeaders
701        {
702            get { return responseHeaders; }
703        }
704
705        /**////<summary>
706        ///获取请求头文本
707        ///</summary>
708        public string StrRequestHeaders
709        {
710            get { return strRequestHeaders; }
711        }
712
713        /**////<summary>
714        ///获取响应头文本
715        ///</summary>
716        public string StrResponseHeaders
717        {
718            get { return strResponseHeaders; }
719        }
720
721        /**////<summary>
722        ///获取或设置Cookie
723        ///</summary>
724        public string Cookie
725        {
726            set { cookie = value; }
727            get { return cookie; }
728        }
729
730        /**////<summary>
731        ///获取或设置编码方式(默认为系统默认编码方式)
732        ///</summary>
733        public Encoding Encoding
734        {
735            set { encoding = value; }
736            get { return encoding; }
737        }
738
739        /**////<summary>
740        ///获取服务器响应文本
741        ///</summary>
742        public string RespHtml
743        {
744            get { return respHtml; }
745        }
746
747
748        /**////<summary>
749        ///获取服务器响应状态码
750        ///</summary>
751        public int StatusCode
752        {
753            get { return statusCode; }
754        }
755    }
756}
757