[C#] GET, POST 전송 및 처리(HttpWebRequest)

C# 에서 GET 혹은 POST 방식으로 http 리퀘스트를 보내는 예제.

 

Get 및 Post 로 원하는 전송 방식에 따라 httpWebRequest.Method 수정하여 사용

public static string GetHttpPOST(string[,] reqstring, string url, string encode, ref int errcode)
{
    string retValue = string.Empty;
 
    if (url.IndexOf("https://") >= 0)
    {
        ServicePointManager.ServerCertificateValidationCallback = new RemoteCertificateValidationCallback(delegate { return true; });
    }
 
    try
    {
        HttpWebRequest httpWebRequest = (HttpWebRequest)WebRequest.Create(url);
        httpWebRequest.Method = "POST";
        Stream requestStream = null;
        byte[] sendData = null;
        if (reqstring != null)
        {
            string postMsg = String.Empty;
 
            for (int i = 0; i < reqstring.GetLength(0); i++)
            {
                postMsg += reqstring[i, 0] + "=" + System.Web.HttpUtility.UrlEncode(reqstring[i, 1], Encoding.GetEncoding(encode)) + "&";
            }
            postMsg = postMsg.Substring(0, postMsg.Length - 1);
 
            if (String.IsNullOrEmpty(encode) || encode == "UTF-8")
            {
                sendData = UTF8Encoding.UTF8.GetBytes(postMsg);
                httpWebRequest.ContentType = "application/x-www-form-urlencoded; charset=UTF-8";
            }
            else if (encode == "EUC-KR")
            {
                sendData = Encoding.GetEncoding("EUC-KR").GetBytes(postMsg);
                httpWebRequest.ContentType = "application/x-www-form-urlencoded; charset=EUC-KR";
            }
            else
            {
                sendData = Encoding.GetEncoding("ks_c_5601-1987").GetBytes(postMsg);
                httpWebRequest.ContentType = "application/x-www-form-urlencoded; charset=ks_c_5601-1987";
            }
            httpWebRequest.ContentLength = sendData.Length;
            requestStream = httpWebRequest.GetRequestStream();
            requestStream.Write(sendData, 0, sendData.Length);
        }
        else
        {
            httpWebRequest.ContentLength = 0;
            requestStream = httpWebRequest.GetRequestStream();
        }
        requestStream.Flush();
        requestStream.Close();
 
        HttpWebResponse httpWebResponse = (HttpWebResponse)httpWebRequest.GetResponse();
        StreamReader streamReader = new StreamReader(httpWebResponse.GetResponseStream(), Encoding.GetEncoding(encode));
        retValue = streamReader.ReadToEnd();
        streamReader.Close();
        httpWebResponse.Close();
    }
    catch (WebException ex)
    {
        if (ex.Response is HttpWebResponse)
        {
            errcode = (int)((HttpWebResponse)ex.Response).StatusCode;
            retValue = ex.Message;
        }
        else
        {
            retValue = ex.Message;
            errcode = -1;
        }
    }
    return retValue;
}
 

 

 

 

활용 예제

설정된 변수 값은 예제여서 임의로 작성

 
public void HttpPost{
    string url = "www.naver.com";                                         // 통신할 URL
    string[,] msg = new String[1, 2] { { "param", "보내는 파라메터" } }; // 전송할 Parameter
    string encodeStr = "EUC-KR";                                          // 인코딩 방식
    int errorcode = 0;                                                     // 에러 전달받을 값
    string returnVal = string.
    returnVal = GetHttpPOST(msg, url, encodeStr, ref errorcode);
}