Create HTTP post request and receive response using C console application

Question

I need to post data to a URL  https   somesite com  to download file in responseStrem based on the parameters I posted  How can I do that using a C  console application   Parameters  filename  userid  password  type

User · Answer

Insted of using System Net WebClient I would recommend to have a look on System Net Http HttpClient which was introduced with net 4 5 and makes your life much easier   Also microsoft recommends to use the HttpClient on this article  http   msdn microsoft com en-us library system net webclient VS 90  aspx  An example could look like this   var client   new HttpClient    var content   new MultipartFormDataContent          new StringContent  myUserId     userid           new StringContent  myFileName     filename           new StringContent  myPassword     password           new StringContent  myType     type       var responseMessage   await client PostAsync  some url   content           var stream   await responseMessage Content ReadAsStreamAsync

User · Answer

HttpWebRequest request   HttpWebRequest WebRequest Create  some url    request Method    POST   request ContentType    application x-www-form-urlencoded   request UserAgent    Mozilla 5 0  compatible  MSIE 9 0  Windows NT 7 1  Trident 5 0    request Accept        request UseDefaultCredentials   true  request Proxy Credentials   System Net CredentialCache DefaultCredentials  doc Save request GetRequestStream     HttpWebResponse resp   request GetResponse   as HttpWebResponse    Hope it helps

User · Answer

For this you can simply use the  HttpWebRequest  and  HttpWebResponse  classes in  net   Below is a sample console app I wrote to demonstrate how easy this is   using System  using System Collections Generic  using System Text  using System Net  using System IO   namespace Test       class Program               static void Main string   args                        string url    www somewhere com                      string fileName     C  output file                HttpWebRequest request    HttpWebRequest WebRequest Create url               request Timeout   5000               try                               using  WebResponse response    HttpWebResponse request GetResponse                                          using  FileStream stream   new FileStream fileName  FileMode Create  FileAccess Write                                                 byte   bytes   ReadFully response GetResponseStream                              stream Write bytes  0  bytes Length                                                                     catch  WebException                                Console WriteLine  Error Occured                                     public static byte   ReadFully Stream input                        byte   buffer   new byte 16   1024               using  MemoryStream ms   new MemoryStream                                  int read                  while   read   input Read buffer  0  buffer Length    gt  0                                        ms Write buffer  0  read                                     return ms ToArray                                      Enjoy

User · Answer

Take a look at the System Net WebClient class  it can be used to issue requests and handle their responses  as well as to download files    http   www hanselman com blog HTTPPOSTsAndHTTPGETsWithWebClientAndCAndFakingAPostBack aspx  http   msdn microsoft com en-us library system net webclient VS 90  aspx

User · Answer

using System  using System Collections Generic  using System Linq  using System Text  using System Net  using System IO   namespace WebserverInteractionClassLibrary       public class RequestManager               public string LastResponse   protected set  get             CookieContainer cookies   new CookieContainer             internal string GetCookieValue Uri SiteUri string name                        Cookie cookie   cookies GetCookies SiteUri  name               return  cookie    null    null   cookie Value                     public string GetResponseContent HttpWebResponse response                        if  response    null                                throw new ArgumentNullException  response                              Stream dataStream   null              StreamReader reader   null              string responseFromServer   null               try                                  Get the stream containing content returned by the server                  dataStream   response GetResponseStream                       Open the stream using a StreamReader for easy access                  reader   new StreamReader dataStream                      Read the content                  responseFromServer   reader ReadToEnd                       Cleanup the streams and the response                            catch  Exception ex                                Console WriteLine ex Message                             finally                                               if  reader    null                                        reader Close                                      if  dataStream    null                                        dataStream Close                                      response Close                              LastResponse   responseFromServer              return responseFromServer                     public HttpWebResponse SendPOSTRequest string uri  string content  string login  string password  bool allowAutoRedirect                        HttpWebRequest request   GeneratePOSTRequest uri  content  login  password  allowAutoRedirect               return GetResponse request                      public HttpWebResponse SendGETRequest string uri  string login  string password  bool allowAutoRedirect                        HttpWebRequest request   GenerateGETRequest uri  login  password  allowAutoRedirect               return GetResponse request                      public HttpWebResponse SendRequest string uri  string content  string method  string login  string password  bool allowAutoRedirect                        HttpWebRequest request   GenerateRequest uri  content  method  login  password  allowAutoRedirect               return GetResponse request                      public HttpWebRequest GenerateGETRequest string uri  string login  string password  bool allowAutoRedirect                        return GenerateRequest uri  null   GET   null  null  allowAutoRedirect                      public HttpWebRequest GeneratePOSTRequest string uri  string content  string login  string password  bool allowAutoRedirect                        return GenerateRequest uri  content   POST   null  null  allowAutoRedirect                      internal HttpWebRequest GenerateRequest string uri  string content  string method  string login  string password  bool allowAutoRedirect                        if  uri    null                                throw new ArgumentNullException  uri                                 Create a request using a URL that can receive a post               HttpWebRequest request    HttpWebRequest HttpWebRequest Create uri                  Set the Method property of the request to POST              request Method   method                 Set cookie container to maintain cookies             request CookieContainer   cookies              request AllowAutoRedirect   allowAutoRedirect                 If login is empty use defaul credentials             if  string IsNullOrEmpty login                                 request Credentials   CredentialCache DefaultNetworkCredentials                            else                               request Credentials   new NetworkCredential login  password                             if  method     POST                                    Convert POST data to a byte array                  byte   byteArray   Encoding UTF8 GetBytes content                      Set the ContentType property of the WebRequest                  request ContentType    application x-www-form-urlencoded                      Set the ContentLength property of the WebRequest                  request ContentLength   byteArray Length                     Get the request stream                  Stream dataStream   request GetRequestStream                       Write the data to the request stream                  dataStream Write byteArray  0  byteArray Length                      Close the Stream object                  dataStream Close                              return request                     internal HttpWebResponse GetResponse HttpWebRequest request                        if  request    null                                throw new ArgumentNullException  request                              HttpWebResponse response   null              try                               response    HttpWebResponse request GetResponse                                    cookies Add response Cookies                                      Print the properties of each cookie                  Console WriteLine   nCookies                      foreach  Cookie cook in cookies GetCookies request RequestUri                                         Console WriteLine  Domain   0   String   1    cook Domain  cook ToString                                                 catch  WebException ex                                Console WriteLine  Web exception occurred  Status code   0    ex Status                             catch  Exception ex                                Console WriteLine ex Message                             return response

[c#] Create HTTP post request and receive response using C# console application

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