转发http请求的实例

 ???/// <summary> ???/// eagleEyeHandler 的摘要说明 ???/// </summary> ???public class eagleEyeHandler : IHttpHandler ???{ ???????/// <summary> ???????/// 处理开始 ???????/// </summary> ???????/// <param name="context"></param> ???????public void ProcessRequest(HttpContext context) ???????{ ???????????string ak = "";//ak ???????????string service_id = "";//service_id ???????????var ah = "http:"; ???????????//转发地址 ???????????var url = context.Request["url"]; ???????????var agency_metbod = context.Request["agency_metbod"]; ???????????var callback = context.Request["callback"]; ???????????var metbod = context.Request.HttpMethod.ToUpper(); ???????????if (metbod != "GET" && metbod != "POST") { return;/* 非合法请求 停止处理业务 */ } ???????????//参数装载 ???????????Dictionary<string, string> id = new Dictionary<string, string>(); ???????????if (url == null) return;/*没有传输请求路径 停止处理业务*/ ???????????if (agency_metbod == null) agency_metbod = "GET"; ???????????//接到请求数据 代理转发 ?一律接收跨域请求 ajax jsonp (只能get传参) ???????????var sParams = string.Format("?ak={0}&service_id={1}&", ak, service_id); ???????????var QueryString = context.Request.QueryString; ???????????foreach (string item in QueryString.Keys) ???????????{ ???????????????/* callback说明 待定 是否要屏蔽callback参数 ?问题：如果相同的callback 并发足够快 服务器应该会返回 [callback] && [callback] ( jsonData ) */ ???????????????if (item == "url" || item == "metbod") { continue; }//屏蔽不需要的参数 减少传输量 ???//|| item == "callback" ???????????????sParams += string.Format("{0}={1}&", item, context.Request[item].ToString()); ???????????} ???????????HttpWebResponse hr = null; ???????????if (agency_metbod == "GET") hr = HttpWebResponseUtility.CreateGetHttpResponse(ah + url + sParams, null, null, null);//GET ???????????else hr = HttpWebResponseUtility.CreatePostHttpResponse(ah + url, sParams, null, null, System.Text.Encoding.UTF8, null);//POST ???????????StreamReader sr = new StreamReader(hr.GetResponseStream()); ???????????var result = sr.ReadToEnd();//读取所有数据 ???????????if (result.IndexOf("(") > -1) ???????????{ ???????????????result = result.Substring(result.IndexOf("(") + 1, result.LastIndexOf(")") - result.IndexOf("(") - 1);//取消相应时的不必要数据(callback说明) ???????????} ???????????sr.Close(); ???????????if (callback == null) ???????????????context.Response.Write(result); ???????????else ???????????????context.Response.Write(callback.ToString() + "(" + result + ")"); ???????????//LogWrite.AddUpdateLog("LOG", "http:" + url + sParams);//写入日志 ???????????//LogWrite.AddUpdateLog("LOG", callback.ToString() + "(" + result + ")"); ???????????context.Response.End(); ???????} ???????public bool IsReusable ???????{ ???????????get ???????????{ ???????????????return false; ???????????} ???????} ???}

 ???/// ??????/// 有关HTTP请求的辅助类 ?????/// ??????public class HttpWebResponseUtility ???{ ???????private static readonly string DefaultUserAgent = "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.2; SV1; .NET CLR 1.1.4322; .NET CLR 2.0.50727)"; ???????/// ??????????/// 创建GET方式的HTTP请求 ?????????/// ??????????/// ????????public static HttpWebResponse CreateGetHttpResponse(string url, int? timeout, string userAgent, CookieCollection cookies) ???????{ ???????????if (string.IsNullOrEmpty(url)) ???????????{ ???????????????throw new ArgumentNullException("url"); ???????????} ???????????HttpWebRequest request = WebRequest.Create(url) as HttpWebRequest; ???????????request.Method = "GET"; request.UserAgent = DefaultUserAgent; ???????????if (!string.IsNullOrEmpty(userAgent)) { request.UserAgent = userAgent; } ???????????if (timeout.HasValue) { request.Timeout = timeout.Value; } ???????????if (cookies != null) ???????????{ ???????????????request.CookieContainer = new CookieContainer(); request.CookieContainer.Add(cookies); ???????????} ???????????return request.GetResponse() as HttpWebResponse; ???????} ???????/// <summary> ???????/// CreatePostHttpResponse 创建post请求 ???????/// </summary> ???????/// <param name="url">请求地址</param> ???????/// <param name="parameters">请求参数</param> ???????/// <param name="timeout">过期时间 ?可为空</param> ???????/// <param name="userAgent">userAgent 可为空</param> ???????/// <param name="requestEncoding">编码格式</param> ???????/// <param name="cookies">cookies</param> ???????/// <returns></returns> ???????public static HttpWebResponse CreatePostHttpResponse(string url, IDictionary parameters, int? timeout, string userAgent, Encoding requestEncoding, CookieCollection cookies) ???????{ ???????????if (string.IsNullOrEmpty(url)) { throw new ArgumentNullException("url"); } ???????????if (requestEncoding == null) { throw new ArgumentNullException("requestEncoding"); } ???????????HttpWebRequest request = null; //如果是发送HTTPS请求 ???????????if (url.StartsWith("https", StringComparison.OrdinalIgnoreCase)) ???????????{ ???????????????ServicePointManager.ServerCertificateValidationCallback = new RemoteCertificateValidationCallback(CheckValidationResult); ???????????????request = WebRequest.Create(url) as HttpWebRequest; ???????????????request.ProtocolVersion = HttpVersion.Version10; ???????????} ???????????else ???????????{ ???????????????request = WebRequest.Create(url) as HttpWebRequest; ???????????} ???????????request.Method = "POST"; ???????????request.ContentType = "application/x-www-form-urlencoded"; ???????????if (!string.IsNullOrEmpty(userAgent)) ???????????{ request.UserAgent = userAgent; } ???????????else { request.UserAgent = DefaultUserAgent; } ???????????if (timeout.HasValue) { request.Timeout = timeout.Value; } ???????????if (cookies != null) ???????????{ ???????????????request.CookieContainer = new CookieContainer(); request.CookieContainer.Add(cookies); ???????????} ???????????//如果需要POST数据 ????????????if (!(parameters == null || parameters.Count == 0)) ???????????{ ???????????????StringBuilder buffer = new StringBuilder(); ???????????????int i = 0; ???????????????foreach (string key in parameters.Keys) ???????????????{ ???????????????????if (i > 0) { buffer.AppendFormat("&{0}={1}", key, parameters[key]); } ???????????????????else { buffer.AppendFormat("{0}={1}", key, parameters[key]); } ???????????????????i++; ???????????????} ???????????????byte[] data = requestEncoding.GetBytes(buffer.ToString()); ???????????????using (Stream stream = request.GetRequestStream()) ???????????????{ ???????????????????stream.Write(data, 0, data.Length); ???????????????} ???????????} ???????????return request.GetResponse() as HttpWebResponse; ???????} ???????/// <summary> ???????/// CreatePostHttpResponse 创建post请求 ???????/// </summary> ???????/// <param name="url">请求地址</param> ???????/// <param name="sParameters">请求参数 （?key=value&key1=value1...）</param> ???????/// <param name="timeout">过期时间 ?可为空</param> ???????/// <param name="userAgent">userAgent 可为空</param> ???????/// <param name="requestEncoding">编码格式</param> ???????/// <param name="cookies">cookies</param> ???????/// <returns></returns> ???????public static HttpWebResponse CreatePostHttpResponse(string url, string sParameters, int? timeout, string userAgent, Encoding requestEncoding, CookieCollection cookies) ???????{ ???????????if (string.IsNullOrEmpty(url)) { throw new ArgumentNullException("url"); } ???????????if (requestEncoding == null) { throw new ArgumentNullException("requestEncoding"); } ???????????HttpWebRequest request = null; //如果是发送HTTPS请求 ???????????if (url.StartsWith("https", StringComparison.OrdinalIgnoreCase)) ???????????{ ???????????????ServicePointManager.ServerCertificateValidationCallback = new RemoteCertificateValidationCallback(CheckValidationResult); ???????????????request = WebRequest.Create(url) as HttpWebRequest; ???????????????request.ProtocolVersion = HttpVersion.Version10; ???????????} ???????????else ???????????{ ???????????????request = WebRequest.Create(url) as HttpWebRequest; ???????????} ???????????request.Method = "POST"; ???????????request.ContentType = "application/x-www-form-urlencoded"; ???????????if (!string.IsNullOrEmpty(userAgent)) ???????????{ request.UserAgent = userAgent; } ???????????else { request.UserAgent = DefaultUserAgent; } ???????????if (timeout.HasValue) { request.Timeout = timeout.Value; } ???????????if (cookies != null) ???????????{ ???????????????request.CookieContainer = new CookieContainer(); request.CookieContainer.Add(cookies); ???????????} ???????????//如果需要POST数据 ????????????if (sParameters != null && sParameters != "") ???????????{ ???????????????StringBuilder buffer = new StringBuilder(); ???????????????buffer = buffer.Append(sParameters); ???????????????byte[] data = requestEncoding.GetBytes(buffer.ToString()); ???????????????using (Stream stream = request.GetRequestStream()) ???????????????{ ???????????????????stream.Write(data, 0, data.Length); ???????????????} ???????????} ???????????return request.GetResponse() as HttpWebResponse; ???????} ???????private static bool CheckValidationResult(object sender, X509Certificate certificate, X509Chain chain, SslPolicyErrors errors) ???????{ ???????????return true; //总是接受 ????????} ???}