WEB项目后端跨域请求

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using System; using System.Collections.Generic; using System.IO; using System.Linq; using System.Net; using System.Text; using System.Web; using System.Web.SessionState;   namespace GL {     public class CrossDomainHandler:IHttpModule, IRequiresSessionState     {         /// <summary>         /// 释放内存         /// </summary>         public void Dispose()         {         }           /// <summary>         /// 开始请求         /// </summary>         /// <param name="context"></param>         public void Init(HttpApplication context)         {             //页面开始请求时，绑定时间             context.BeginRequest += new EventHandler(context_PreRequestHandlerExecute);         }           /// <summary>         /// 请求处理         /// </summary>         /// <param name="sender"></param>         /// <param name="e"></param>         void context_PreRequestHandlerExecute(object sender, EventArgs e)         {               HttpApplication app = (HttpApplication)sender;             HttpContext context = app.Context;               context.Response.AppendHeader("charset", "utf-8");             context.Response.AppendHeader("defaultCharset", "utf-8");             context.Response.AppendHeader("Content-Type", "text/html; charset=utf-8");               var relativeAddr = context.Request.AppRelativeCurrentExecutionFilePath.Remove(0, 2);             if (relativeAddr.StartsWith("Server"))             {                 var url = string.Concat("http://localhost:89", relativeAddr.Substring(relativeAddr.IndexOf('/')));                 HttpWebRequest request = WebRequest.Create(url) as HttpWebRequest;                 request.Method = "POST";                 request.ContentType = "application/x-www-form-urlencoded";                 var rs = request.GetRequestStream();                 var sb = new StringBuilder("a=a&");                 context.Request.Form.AllKeys.ToList().ForEach(name =>                 {                     sb.AppendFormat("{0}={1}&", name, context.Request.Form[name]);                 });                 var str = sb.ToString();                 if(str.Contains('&'))                 {                     str = str.Substring(0, str.Length - 1);                 }                 var sw = new StreamWriter(rs, Encoding.UTF8);                 sw.Write(sb.ToString());                 sw.Close();                   request.Timeout = 60 * 1000;                 var response = request.GetResponse() as HttpWebResponse;                 var ps = response.GetResponseStream();                 var reader = new StreamReader(ps, Encoding.UTF8);                 string html = reader.ReadToEnd();                 ps.Close();                 context.Response.Write(html);                 context.Response.End();             }         }     } }