http方式获取远程文件内容

    public class HttpServer
    {
        /// <summary>
        /// 读取远程文件的内容
        /// </summary>
        /// <param name="path"></param>
        /// <returns></returns>
        public string ReadFromFile(string serverFilePath)
        {
            if (string.IsNullOrEmpty(serverFilePath))
                return "";

            string ret = "";
            HttpWebRequest req = null;
            HttpWebResponse resp = null;

            try
            {
                req = (HttpWebRequest)HttpWebRequest.Create(serverFilePath);
                req.Method = "GET";
                req.KeepAlive = false;

                resp = req.GetResponse() as HttpWebResponse;
                using (Stream stream = resp.GetResponseStream())
                {
                    using (StreamReader reader = new StreamReader(stream, Encoding.UTF8))
                    {
                        ret = reader.ReadToEnd();
                    }
                }
            }
            catch (Exception ex)
            {
                throw ex;
            }
            finally
            {
                if (req != null)
                    req.Abort();
                if (resp != null)
                    resp.Close();
            }

            return ret;
        }

        /// <summary>
        /// 读取远程文件的内容(异步)
        /// </summary>
        /// <param name="path"></param>
        /// <returns></returns>
        public async Task<string> ReadFromFileAsync(string serverFilePath)
        {
            if (string.IsNullOrEmpty(serverFilePath))
                return "";

            string ret = "";
            HttpWebRequest req = null;
            HttpWebResponse resp = null;

            try
            {
                req = (HttpWebRequest)HttpWebRequest.Create(serverFilePath);
                req.Method = "GET";
                req.KeepAlive = false;

                resp = req.GetResponse() as HttpWebResponse;
                using (Stream stream = resp.GetResponseStream())
                {
                    using (StreamReader reader = new StreamReader(stream, Encoding.UTF8))
                    {
                        ret = await reader.ReadToEndAsync();
                    }
                }
            }
            catch (Exception ex)
            {
                throw ex;
            }
            finally
            {
                if (req != null)
                    req.Abort();
                if (resp != null)
                    resp.Close();
            }

            return ret;
        }
    }