HttpWebRequestExample (C#).java

/* HTTP 요청 함수들 */
public string RequestWebPage(string url, string sendData, CookieContainer cook, Encoding encoding, string referer = "", string origin = "", string host = "")
{
    var req = (HttpWebRequest)WebRequest.Create(url);

    if (!host.Equals("")) { req.Host = host; }
    req.Headers.Add(@"Cache-Control", @"max-age=0");
    if (!origin.Equals("")) { req.Headers.Add(@"Origin", origin); }
    req.Headers.Add(@"Accept-Encoding", @"gzip,deflate");
    req.UserAgent = @"Mozilla/5.0 (Windows NT 6.3; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/42.0.2311.90 Safari/537.36";
    req.Accept = @"text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8";
    req.Method = @"POST";
    req.ContentLength = sendData.Length;
    req.ContentType = @"application/x-www-form-urlencoded";
    req.KeepAlive = true;
    req.CookieContainer = cook; // 세션 저장 쿠키

    req.ServicePoint.UseNagleAlgorithm = false;
    req.ServicePoint.Expect100Continue = false;

    // 속도 개선
    if (!isProxyEnabled()) { req.Proxy = WebRequest.DefaultWebProxy; }

    if (!referer.Equals("")) { req.Referer = referer; }

    //			req.Credentials = CredentialCache.DefaultCredentials;

    try
    {
        StreamWriter writer = new StreamWriter(req.GetRequestStream());
        writer.Write(sendData);
        writer.Close();
        using (HttpWebResponse result = (HttpWebResponse)req.GetResponse())
        {
            result.Cookies = req.CookieContainer.GetCookies(req.RequestUri);

            // 요청이 성공적일 때
            if (result.StatusCode.Equals(HttpStatusCode.OK))
            {
                cookies.Add(result.Cookies);
                //Encoding encode = Encoding.GetEncoding("UTF-8");
                using (Stream strReceiveStream = result.GetResponseStream())
                {
                    if (strReceiveStream != null)
                    {
                        StreamReader reqStreamReader = new StreamReader(strReceiveStream, encoding);

                        string strResult = reqStreamReader.ReadToEnd(); // 데이터 읽어옴

                        req.Abort();
                        strReceiveStream.Close();
                        reqStreamReader.Close();

                        return strResult;
                    }

                }
            }
            else
            {
                return "ERR";
            }

        }
        return "ERR";
    }
    catch (WebException e)
    {
        if (e.Status.Equals(WebExceptionStatus.NameResolutionFailure))
        {
            //MessageBox.Show("인터넷 연결을 확인해주세요");
            return "ERR";
        }
        if (e.Status.Equals(WebExceptionStatus.ProtocolError))
        {
            return "ERR";
        }
        throw;
    }
}
        public string MoveToAnotherPage(string url, CookieContainer cook, Encoding encoding, string referer = "")
{
    if (cook == null) throw new ArgumentNullException("cook");
    var req = (HttpWebRequest)WebRequest.Create(url);

    req.CookieContainer = cook;         // 보관된 cookie 이용
    req.Referer = referer;
    req.ServicePoint.Expect100Continue = false;
    req.ServicePoint.UseNagleAlgorithm = false;
    if (!isProxyEnabled()) { req.Proxy = null; }

    //req.Credentials = CredentialCache.DefaultCredentials;

    try
    {
        using (HttpWebResponse result = (HttpWebResponse)req.GetResponse())
        {
            result.Cookies = req.CookieContainer.GetCookies(req.RequestUri);
            cookies.Add(result.Cookies);     // 추가적인 cookie 보관
            using (Stream strm = result.GetResponseStream())
            {
                if (strm != null)
                {
                    StreamReader sr = new StreamReader(strm, encoding, true);
                    string responseHtml = sr.ReadToEnd();

                    sr.Close();
                    strm.Close();

                    return responseHtml;
                }
            }
        }
    }
    catch (WebException e)
    {
        if (e.Status.Equals(WebExceptionStatus.NameResolutionFailure))
        {
            //MessageBox.Show("인터넷 연결을 확인해주세요");
            return "ERR";
        }
        if (e.Status.Equals(WebExceptionStatus.ProtocolError))
        {
            return "ERR";
        }
        throw;
    }
    return "ERR";
}

private bool isProxyEnabled()
{
    if (WebRequest.DefaultWebProxy.Credentials == null)
    {
        return false;
    }
    return true;
}