中转Http请求

应用场景：公司与外部公司数据对接，外部公司需申请指定IP访问。而本地ip经常变动，无法因ip变动时刻向外部公司申请绑定IP，给本地程序调试带来麻烦，故只能在指定ip服务器上搭建请求中转http请求；

/// <summary>
    /// 中转 绑定ip中转请求；参数Base64解密，gzip压缩返回；
    /// kk 
    /// </summary>
    public class tc : IHttpHandler
    {
        public void ProcessRequest(HttpContext context)
        {
            Dictionary<string, string> dict = AnaylerUrlParaGet(context.Request);
            if (dict.Count == 0 || string.IsNullOrEmpty(dict["url"]) || string.IsNullOrEmpty(dict["postdata"]))
            {
                context.Response.ContentType = "text/plain";
                context.Response.Write("no post data");
                context.Response.End();
            }
            HttpUtil _httputil = new HttpUtil();
            string strurl = Base64.DecodeBase64IgnoreEmpty(dict["url"]);
            string strJson = Base64.DecodeBase64IgnoreEmpty(dict["postdata"]);
            string strcontext = _httputil.HttpPost(strurl, strJson, System.Text.Encoding.UTF8);
            context.Response.ContentType = "application/octet-stream";
            context.Response.BinaryWrite(Common.EncryptHelper.Compress(strcontext));
            context.Response.Flush();
            context.Response.End();
        }

        public bool IsReusable
        {
            get
            {
                return false;
            }
        }

        /// <summary>
        /// 获取GET参数
        /// </summary>
        /// <param name="req"></param>
        /// <returns></returns>
        public Dictionary<string, string> AnaylerUrlParaGet(System.Web.HttpRequest req)
        {
            Dictionary<string, string> dict = new Dictionary<string, string>();
            string tmp1;
            string tmp2;
            System.Collections.Specialized.NameValueCollection col = req.QueryString;
            for (int i = 0; i < col.Count; i++)
            {
                tmp1 = col.AllKeys[i].Trim();
                tmp2 = col[i].Trim();
                if (!dict.ContainsKey(tmp1))
                {
                    dict.Add(tmp1, tmp2);
                }
            }
            return dict;
        }
    }

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