HttpHelper, httphelper class

HttpHelper, httphelper class

Public class HttpHelper {private static CookieContainer _ cc = new CookieContainer (); private static WebProxy _ proxy; private static int _ delayTime; private static int _ timeout = 120000; // The default is 120000 milliseconds (120 seconds ). private static int _ tryTimes = 3; // default retry 3 times private static string _ lastUrl = string. empty; private static string reqUserAgent = "Mozilla/4.0 (compatible; MSIE 7. 0; Windows NT 6.0; Server Load balancer ;. net clr 2.0.50727 ;. net clr 3.0.04506; InfoPath.2) "; // Get public static string Get (string url) {string data = Get (url, _ lastUrl) without referer; _ lastUrl = url; return data ;} /// <summary> /// Get data from server /// </summary> /// <param name = "url"> </param> /// <returns> Return content </returns> public static string Get (string url, string referer) {int failedTimes = _ TryTimes; while (failedTimes --> 0) {try {DelaySomeTime (); HttpWebRequest req = (HttpWebRequest) WebRequest. create (new Uri (url); req. userAgent = reqUserAgent; req. cookieContainer = _ cc; req. referer = referer; req. method = "GET"; req. timeout = _ timeout; if (null! = _ Proxy & null! = _ Proxy. credentials) {req. useDefaultCredentials = true;} req. proxy = _ proxy; // receives the returned string HttpWebResponse res = (HttpWebResponse) req. getResponse (); StreamReader sr = new StreamReader (res. getResponseStream (), Encoding. UTF8); return sr. readToEnd ();} catch (Exception e) {// TraceLog. error ("http get Error:" + e. message); // TraceLog. error ("Url:" + url) ;}} return string. empty;} public static void Do Wnload (string url, string localfile) {WebClient client = new WebClient (); client. downloadFile (url, localfile);} private static void DelaySomeTime () {if (_ delayTime> 0) {Random rd = new Random (); int delayTime = _ delayTime * 1000 + rd. next (1, 1000); Thread. sleep (delayTime );}} /// <summary> /// Set Proxy /// </summary> /// <param name = "server"> </param> /// <param name = "port"> </param> public stat Ic void SetProxy (string server, int port, string username, string password) {if (null! = Server & port> 0) {_ proxy = new WebProxy (server, port); if (null! = Username & null! = Password) {_ proxy. credentials = new NetworkCredential (username, password); _ proxy. bypassProxyOnLocal = true ;}}} /// <summary> /// Set delay connect time /// </summary> /// <param name = "delayTime"> </param> public static void SetDelayConnect (int delayTime) {_ delayTime = delayTime ;} /// <summary> /// Set the timeout for each http request // </summary> /// <param name = "timeout"> </param> public static void SetTimeOut (int timeout) {if (timeout> 0) {_ timeout = timeout ;}} /// <summary> // Set the try times for each http request // </summary> /// <param name = "times"> </param> public static void SetTryTimes (int times) {if (times> 0) {_ tryTimes = times ;}}}

 

What does HttpHelper in C # Mean?

C # does not contain HttpHelper. It is a class written by someone else called HttpHelper.

What references and namespaces need to be added to httphelper?

System. Net;
System. IO;