如何获取和发送Http请求和相应

首先发送get request,从response中获取cookie:

Get:

 string address = string.Empty;
            HttpWebRequest myRequest = (HttpWebRequest)WebRequest.Create(address);
            // Two ways to  set the authorization:
             //Method 1:
            //myRequest.Headers["Authorization"] = "Basic " + Convert.ToBase64String(Encoding.Default.GetBytes("domainName/name" + ":" + "psw"));

            //Method 2:
            NetworkCredential cred = CredentialCache.DefaultCredentials as NetworkCredential;
            myRequest.Credentials = cred;
            myRequest.Method = "GET";
            myRequest.Accept = "image/jpeg, image/gif, image/pjpeg, application/x-ms-application, application/xaml+xml, application/x-ms-xbap, application/vnd.ms-excel, application/vnd.ms-powerpoint, application/msword, */*";
            myRequest.Headers.Set("Accept-Language", "en-US");
            myRequest.UserAgent = "Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.1; Trident/4.0)";
            myRequest.Headers.Set("Accept-Encoding", "gzip, deflate");
            myRequest.Host = "HostName";
            myRequest.CookieContainer = new CookieContainer();
            myRequest.CookieContainer.Add(new Uri("http://localhost"),new Cookie());
       

            // Resolve the issue of Expect: 100-continue
            // eg: http://blogs.msdn.com/b/fiddler/archive/2011/11/05/http-expect-continue-delays-transmitting-post-bodies-by-up-to-350-milliseconds.aspx
            myRequest.ServicePoint.Expect100Continue = false;
            
            string cookieString = string.Empty;
            //string 
            using (HttpWebResponse webResponse = myRequest.GetResponse() as HttpWebResponse)
            {
                // Read response head info.
                cookieString = webResponse.Headers["Set-Cookie"];
               
                // Keep the cookie and use when the next send request
                myRequest.CookieContainer = new CookieContainer();
                myRequest.CookieContainer.SetCookies(new Uri(address), cookieString);
              
                string resultstring = webResponse.GetResponseString();
            }

Extension method:

 public static class HttpWebResponseExtension
    {
        public static string GetResponseString(this HttpWebResponse res)
        {
            string resultstring = null;
            using (Stream receiveStream = res.GetResponseStream())
            {
                using (StreamReader sr = new StreamReader(receiveStream))
                {
                    resultstring = sr.ReadToEnd();
                }
            }
            Console.WriteLine("Get Response String Completed.");
            return resultstring;
        }
    }

Post:

 private static void PostMethod(string address, CookieContainer container, Encoding mye, string bodyContent, string cookieString)
        {
            HttpWebRequest myReq = (HttpWebRequest)WebRequest.Create(address);

            byte[] arrB = mye.GetBytes(bodyContent);

            myReq.Method = "POST";
            myReq.Accept = "image/jpeg, image/gif, image/pjpeg, application/x-ms-application, application/xaml+xml, application/x-ms-xbap, application/vnd.ms-excel, application/vnd.ms-powerpoint, application/msword, */*";
            myReq.ContentLength = arrB.Length;
            myReq.Referer = "http://localHost";
            myReq.Host = "HostName";
            myReq.UserAgent = "Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.1; Trident/4.0)";
            myReq.ContentLength = bodyContent.Length;
          
            NetworkCredential cred = CredentialCache.DefaultCredentials as NetworkCredential;
            myReq.Credentials = cred;
            myReq.ContentType = "multipart/form-data; boundary=---------------------------1223334444555";
            myReq.Headers.Set("Accept-Encoding", "gzip, deflate");
            myReq.Headers.Set("Accept-Language", "en-US");
            myReq.Headers.Set("Pragma", "no-cache");
            myReq.KeepAlive = true;

            myReq.CookieContainer = new CookieContainer();
            myReq.CookieContainer.SetCookies(new Uri(address), cookieString);
            myReq.ServicePoint.Expect100Continue = false;         

            string resultstring = string.Empty;
            string fileName = string.Empty;

            try
            {
                using (HttpWebResponse resPost = myReq.GetResponse() as HttpWebResponse)
                {
                    fileName = resPost.Headers["Content-disposition"];

                    int index = fileName.IndexOf("filename=");

                    fileName = fileName.Substring(index + 9);

                    resultstring = resPost.GetResponseString();
                }

            }
            catch (WebException err)
            {
                using (HttpWebResponse resErr = err.Response as HttpWebResponse)
                {
                    resultstring = resErr.GetResponseString();
                }
            }

            string path = Path.Combine("D:\\FolderName", fileName);
            File.WriteAllText(path, resultstring);
      
        }