How to upload file to server with HTTP POST multipart form-data

Question

I am developing Windows Phone 8 app  I want to upload SQLite database via PHP web service using HTTP POST request with MIME type multipart form-data  amp  a string data called  userid SOME ID     I don t want to use 3rd party libs like HttpClient  RestSharp or MyToolkit  I tried the below code but it doesn t upload the file  amp  also doesn t give me any errors  It s working fine in Android  PHP  etc so there s no issue in web service  Below is my given code  for WP8   what s wrong with it   I ve googled and I m not getting specific for WP8  async void MainPage Loaded object sender  RoutedEventArgs e        var file   await Windows ApplicationModel Package Current InstalledLocation GetFileAsync DBNAME         Below line gives me file with 0 bytes  why  Should I use        IsolatedStorageFile instead of StorageFile       var file   await ApplicationData Current LocalFolder GetFileAsync DBNAME       byte   fileBytes   null      using  var stream   await file OpenReadAsync                  fileBytes   new byte stream Size           using  var reader   new DataReader stream                         await reader LoadAsync  uint stream Size               reader ReadBytes fileBytes                          var res   await HttpPost Util UPLOAD BACKUP  fileBytes       HttpPost fileBytes      private void HttpPost byte   file bytes        HttpWebRequest httpWebRequest    HttpWebRequest WebRequest Create  http   www myserver com upload php        httpWebRequest ContentType    multipart form-data       httpWebRequest Method    POST       var asyncResult   httpWebRequest BeginGetRequestStream  ar    gt    GetRequestStreamCallback ar  file bytes      httpWebRequest        private void GetRequestStreamCallback IAsyncResult asynchronousResult  byte   postData            DON T KNOW HOW TO PASS  userid some user id        HttpWebRequest request    HttpWebRequest asynchronousResult AsyncState        Stream postStream   request EndGetRequestStream asynchronousResult         postStream Write postData  0  postData Length         postStream Close          var asyncResult   request BeginGetResponse new AsyncCallback GetResponseCallback   request          private void GetResponseCallback IAsyncResult asynchronousResult            HttpWebRequest request    HttpWebRequest asynchronousResult AsyncState        HttpWebResponse response    HttpWebResponse request EndGetResponse asynchronousResult         Stream streamResponse   response GetResponseStream          StreamReader streamRead   new StreamReader streamResponse         string responseString   streamRead ReadToEnd          streamResponse Close          streamRead Close          response Close            I also tried to solve my problem in Windows 8 but it s also not working   public async Task Upload byte   fileBytes        using  var client   new HttpClient                  using  var content   new MultipartFormDataContent  Upload----    DateTime Now ToString System Globalization CultureInfo InvariantCulture                          content Add new StreamContent new MemoryStream fileBytes                   Not sure below line is true or not             content Add new StringContent  userid farhanW8                 using  var message   await client PostAsync  http   www myserver com upload php   content                                 var input   await message Content ReadAsStringAsync

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Top to  loop answer   We got below error for Asp Net MVC  Unable to connect to the remote server   Fix  After adding the below code in Web Confing issue has been resolved for us     lt system net gt       lt defaultProxy useDefaultCredentials  true   gt       lt  defaultProxy gt     lt  system net gt

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I know this is and old thread  but I was fighting with this and I would like to share my solution  This solution works with HttpClient and MultipartFormDataContent  from System Net Http  You can release it with  NET Core 1 0 or higher  or  NET Framework 4 5 or higher  As a quick summary  it s an asynchronous method that receives as parameters the URL in which you want to perform the POST  a key value collection for sending strings  and a key value collection for sending files  private static async Task lt HttpResponseMessage gt  Post string url  NameValueCollection strings  NameValueCollection files        var formContent   new MultipartFormDataContent    If you need a boundary  you can define it here              Strings     foreach  string key in strings Keys                string inputName   key          string content   strings key            formContent Add new StringContent content   inputName                 Files     foreach  string key in files Keys                string inputName   key          string fullPathToFile   files key            FileStream fileStream   File OpenRead fullPathToFile           var streamContent   new StreamContent fileStream           var fileContent   new ByteArrayContent streamContent ReadAsByteArrayAsync   Result           formContent Add fileContent  inputName  Path GetFileName fullPathToFile               var myHttpClient   new HttpClient        var response   await myHttpClient PostAsync url  formContent         string stringContent   await response Content ReadAsStringAsync       If you need to read the content      return response     You can prepare your POST like this  you can add so many strings and files as you need   string url     quot http   yoursite com upload php quot   NameValueCollection strings   new NameValueCollection    strings Add  quot stringInputName1 quot    quot The content for input 1 quot    strings Add  quot stringInputNameN quot    quot The content for input N quot     NameValueCollection files   new NameValueCollection    files Add  quot fileInputName1 quot     quot FullPathToFile1 quot       Path   filename files Add  quot fileInputNameN quot     quot FullPathToFileN quot     And finally  call the method like this  var result   Post url  strings  files  GetAwaiter   GetResult     If you want  you can check your status code  and show the reason as below  if  result StatusCode    HttpStatusCode OK           Logic if all was OK   else          You can show a message like this      Console WriteLine string Format  quot Error  StatusCode   0    ReasonPhrase   1  quot   result StatusCode  result ReasonPhrase       And if someone need it  here I let a small example of how to receive store a file with PHP  at the other side of our  Net app    lt  php  if  isset   FILES  fileInputName1     amp  amp    FILES  fileInputName1    error       UPLOAD ERR OK       fileTmpPath     FILES  fileInputName1    tmp name       fileName     FILES  fileInputName1    name       move uploaded file  fileTmpPath    the final path you want      fileName      I hope you find it useful  I am attentive to your questions

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I ve been playing around a little bit and came up with a simplified  more generic solution   private static string sendHttpRequest string url  NameValueCollection values  NameValueCollection files   null        string boundary    ----------------------------    DateTime Now Ticks ToString  x           The first boundary     byte   boundaryBytes   System Text Encoding UTF8 GetBytes   r n--    boundary     r n           The last boundary     byte   trailer   System Text Encoding UTF8 GetBytes   r n--    boundary    -- r n           The first time it itereates  we need to make sure it doesn t put too many new paragraphs down or it completely messes up poor webbrick     byte   boundaryBytesF   System Text Encoding ASCII GetBytes  --    boundary     r n            Create the request and set parameters     HttpWebRequest request    HttpWebRequest  WebRequest Create url       request ContentType    multipart form-data  boundary     boundary      request Method    POST       request KeepAlive   true      request Credentials   System Net CredentialCache DefaultCredentials          Get request stream     Stream requestStream   request GetRequestStream         foreach  string key in values Keys                   Write item to stream         byte   formItemBytes   System Text Encoding UTF8 GetBytes string Format  Content-Disposition  form-data  name    0     r n r n 1    key  values key             requestStream Write boundaryBytes  0  boundaryBytes Length           requestStream Write formItemBytes  0  formItemBytes Length              if  files    null                 foreach string key in files Keys                        if File Exists files key                                  int bytesRead   0                  byte   buffer   new byte 2048                   byte   formItemBytes   System Text Encoding UTF8 GetBytes string Format  Content-Disposition  form-data  name    0     filename    1    r nContent-Type  application octet-stream r n r n   key  files key                     requestStream Write boundaryBytes  0  boundaryBytes Length                   requestStream Write formItemBytes  0  formItemBytes Length                    using  FileStream fileStream   new FileStream files key   FileMode Open  FileAccess Read                                         while   bytesRead   fileStream Read buffer  0  buffer Length      0                                                   Write file content to stream  byte by byte                         requestStream Write buffer  0  bytesRead                                              fileStream Close                                                            Write trailer and close stream     requestStream Write trailer  0  trailer Length       requestStream Close         using  StreamReader reader   new StreamReader request GetResponse   GetResponseStream                   return reader ReadToEnd               You can use it like this   string fileLocation   Environment GetFolderPath Environment SpecialFolder MyDocuments    Path DirectorySeparatorChar    somefile jpg   NameValueCollection values   new NameValueCollection    NameValueCollection files   new NameValueCollection    values Add  firstName    Alan    files Add  profilePicture   fileLocation   sendHttpRequest  http   example com handler php   values  files     And in the PHP script you could handle data like this   echo   POST  firstName     name     POST  firstName     image     FILES  profilePicture     ds   DIRECTORY SEPARATOR  move uploaded file  image  tmp name    realpath dirname   FILE        ds    uploads     ds    image  name

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Basic implementation using MultipartFormDataContent  - HttpClient httpClient   new HttpClient    MultipartFormDataContent form   new MultipartFormDataContent     form Add new StringContent username    quot username quot    form Add new StringContent useremail    quot email quot    form Add new StringContent password    quot password quot                form Add new ByteArrayContent file bytes  0  file bytes Length    quot profile pic quot    quot hello1 jpg quot    HttpResponseMessage response   await httpClient PostAsync  quot PostUrl quot   form    response EnsureSuccessStatusCode    httpClient Dispose    string sd   response Content ReadAsStringAsync   Result

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This simplistic version also works   public void UploadMultipart byte   file  string filename  string contentType  string url        var webClient   new WebClient        string boundary    ------------------------    DateTime Now Ticks ToString  x        webClient Headers Add  Content-Type    multipart form-data  boundary     boundary       var fileData   webClient Encoding GetString file       var package   string Format  -- 0  r nContent-Disposition  form-data  name   file    filename    1    r nContent-Type   2  r n r n 3  r n-- 0 -- r n   boundary  filename  contentType  fileData        var nfile   webClient Encoding GetBytes package        byte   resp   webClient UploadData url   POST   nfile       Add any extra required headers if needed

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You can use this class   using System Collections Specialized  class Post File       public static void HttpUploadFile string url  string file  string paramName  string contentType  NameValueCollection nvc                string boundary    ---------------------------    DateTime Now Ticks ToString  x            byte   boundarybytes   System Text Encoding ASCII GetBytes   r n--    boundary     r n            byte   boundarybytesF   System Text Encoding ASCII GetBytes  --    boundary     r n        the first time it itereates  you need to make sure it doesn t put too many new paragraphs down or it completely messes up poor webbrick              HttpWebRequest wr    HttpWebRequest WebRequest Create url           wr Method    POST           wr KeepAlive   true          wr Credentials   System Net CredentialCache DefaultCredentials          wr Accept    text html application xhtml xml application xml q 0 9     q 0 8           var nvc2   new NameValueCollection            nvc2 Add  Accepts-Language    en-us en q 0 5            wr Headers Add nvc2           wr ContentType    multipart form-data  boundary     boundary            Stream rs   wr GetRequestStream             bool firstLoop   true          string formdataTemplate    Content-Disposition  form-data  name    0    r n r n 1            foreach  string key in nvc Keys                        if  firstLoop                                rs Write boundarybytesF  0  boundarybytesF Length                   firstLoop   false                            else                               rs Write boundarybytes  0  boundarybytes Length                             string formitem   string Format formdataTemplate  key  nvc key                byte   formitembytes   System Text Encoding UTF8 GetBytes formitem               rs Write formitembytes  0  formitembytes Length                     rs Write boundarybytes  0  boundarybytes Length            string headerTemplate    Content-Disposition  form-data  name    0     filename    1    r nContent-Type   2  r n r n           string header   string Format headerTemplate  paramName  new FileInfo file  Name  contentType           byte   headerbytes   System Text Encoding UTF8 GetBytes header           rs Write headerbytes  0  headerbytes Length            FileStream fileStream   new FileStream file  FileMode Open  FileAccess Read           byte   buffer   new byte 4096           int bytesRead   0          while   bytesRead   fileStream Read buffer  0  buffer Length      0                        rs Write buffer  0  bytesRead                     fileStream Close             byte   trailer   System Text Encoding ASCII GetBytes   r n--    boundary    -- r n            rs Write trailer  0  trailer Length           rs Close             WebResponse wresp   null          try                       wresp   wr GetResponse                Stream stream2   wresp GetResponseStream                StreamReader reader2   new StreamReader stream2                     catch  Exception ex                        if  wresp    null                                wresp Close                    wresp   null                                  finally                       wr   null                      use it                               NameValueCollection nvc   new NameValueCollection      nvc Add  id    TTR    nvc Add  table name    uploadfile    nvc Add  commit    uploadfile    Post File HttpUploadFile  http   example upload file php     C  user yourfile docx    uploadfile    application vnd ms-excel   nvc     example server upload file php   m  File upload     copy   FILES  uploadfile    tmp name   getcwd              FILES  uploadfile    name       success     failed     function m  msg        echo   lt div style  background  f1f1f1 border 1px solid  ddd padding 15px font 14px text-align center font-weight bold   gt        echo  msg      echo   lt  div gt

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The below code reads a file  converts it to a byte array and then makes a request to the server       public void PostImage                 HttpClient httpClient   new HttpClient            MultipartFormDataContent form   new MultipartFormDataContent             byte   imagebytearraystring   ImageFileToByteArray   C  Users Downloads icon png            form Add new ByteArrayContent imagebytearraystring  0  imagebytearraystring Count      profile pic    hello1 jpg            HttpResponseMessage response   httpClient PostAsync  your url   form  Result           httpClient Dispose            string sd   response Content ReadAsStringAsync   Result             private byte   ImageFileToByteArray string fullFilePath                FileStream fs   File OpenRead fullFilePath           byte   bytes   new byte fs Length           fs Read bytes  0  Convert ToInt32 fs Length            fs Close            return bytes

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Here s my final working code  My web service needed one file  POST parameter name was  file    amp  a string value  POST parameter name was  userid          lt summary gt      Occurs when upload backup application bar button is clicked  Author   Farhan Ghumra       lt  summary gt  private async void btnUploadBackup Click object sender  EventArgs e        var dbFile   await ApplicationData Current LocalFolder GetFileAsync Util DBNAME       var fileBytes   await GetBytesAsync dbFile       var Params   new Dictionary lt string  string gt       userid    9           UploadFilesToServer new Uri Util UPLOAD BACKUP   Params  Path GetFileName dbFile Path    application octet-stream   fileBytes           lt summary gt      Creates HTTP POST request  amp  uploads database to server  Author   Farhan Ghumra      lt  summary gt  private void UploadFilesToServer Uri uri  Dictionary lt string  string gt  data  string fileName  string fileContentType  byte   fileData        string boundary    ----------    DateTime Now Ticks ToString  x        HttpWebRequest httpWebRequest    HttpWebRequest WebRequest Create uri       httpWebRequest ContentType    multipart form-data  boundary     boundary      httpWebRequest Method    POST       httpWebRequest BeginGetRequestStream  result    gt                try                       HttpWebRequest request    HttpWebRequest result AsyncState              using  Stream requestStream   request EndGetRequestStream result                                 WriteMultipartForm requestStream  boundary  data  fileName  fileContentType  fileData                             request BeginGetResponse a   gt                                try                                       var response   request EndGetResponse a                       var responseStream   response GetResponseStream                        using  var sr   new StreamReader responseStream                                                 using  StreamReader streamReader   new StreamReader response GetResponseStream                                                           string responseString   streamReader ReadToEnd                                  responseString is depend upon your web service                              if  responseString     Success                                                                 MessageBox Show  Backup stored successfully on server                                                               else                                                               MessageBox Show  Error occurred while uploading backup on server                                                                                                                      catch  Exception                                                      null                     catch  Exception                              httpWebRequest           lt summary gt      Writes multi part HTTP POST request  Author   Farhan Ghumra      lt  summary gt  private void WriteMultipartForm Stream s  string boundary  Dictionary lt string  string gt  data  string fileName  string fileContentType  byte   fileData            The first boundary     byte   boundarybytes   Encoding UTF8 GetBytes  --    boundary     r n            the last boundary      byte   trailer   Encoding UTF8 GetBytes   r n--    boundary    -- r n            the form data  properly formatted     string formdataTemplate    Content-Dis-data  name    0    r n r n 1            the form-data file upload  properly formatted     string fileheaderTemplate    Content-Dis-data  name    0     filename    1     r nContent-Type   2  r n r n            Added to track if we need a CRLF or not      bool bNeedsCRLF   false       if  data    null                foreach  string key in data Keys                            if we need to drop a CRLF  do that              if  bNeedsCRLF                  WriteToStream s    r n                     Write the boundary              WriteToStream s  boundarybytes                    Write the key              WriteToStream s  string Format formdataTemplate  key  data key                 bNeedsCRLF   true                           If we don t have keys  we don t need a crlf      if  bNeedsCRLF          WriteToStream s    r n         WriteToStream s  boundarybytes       WriteToStream s  string Format fileheaderTemplate   file   fileName  fileContentType            Write the file data to the stream      WriteToStream s  fileData       WriteToStream s  trailer           lt summary gt      Writes string to stream  Author   Farhan Ghumra      lt  summary gt  private void WriteToStream Stream s  string txt        byte   bytes   Encoding UTF8 GetBytes txt       s Write bytes  0  bytes Length           lt summary gt      Writes byte array to stream  Author   Farhan Ghumra      lt  summary gt  private void WriteToStream Stream s  byte   bytes        s Write bytes  0  bytes Length           lt summary gt      Returns byte array from StorageFile  Author   Farhan Ghumra      lt  summary gt  private async Task lt byte   gt  GetBytesAsync StorageFile file        byte   fileBytes   null      using  var stream   await file OpenReadAsync                  fileBytes   new byte stream Size           using  var reader   new DataReader stream                         await reader LoadAsync  uint stream Size               reader ReadBytes fileBytes                        return fileBytes      I am very much thankful to Darin Rousseau for helping me

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Here is multipart data post with basic authentication C   public string UploadFilesToRemoteUrl string url                try                                                     Dictionary lt string  object gt  formFields   new Dictionary lt string  object gt                 formFields Add  requestid       id     idvalue                    string boundary    ----------------------------    DateTime Now Ticks ToString  x                 HttpWebRequest request    HttpWebRequest WebRequest Create url               request ContentType    multipart form-data  boundary     boundary                  basic authentication              var username    userid               var password    password                string credidentials   username         password              var authorization   Convert ToBase64String Encoding Default GetBytes credidentials                request Headers  Authorization      Basic     authorization               request Method    POST               request KeepAlive   true               Stream memStream   new System IO MemoryStream                WriteFormData formFields  memStream  boundary                FileInfo fileToUpload   new FileInfo   filelocation with name                string fileFormKey    file               if  fileToUpload    null                                WritefileToUpload fileToUpload  memStream  boundary  fileFormKey                             request ContentLength   memStream Length               using  Stream requestStream   request GetRequestStream                                  memStream Position   0                  byte   tempBuffer   new byte memStream Length                   memStream Read tempBuffer  0  tempBuffer Length                   memStream Close                    requestStream Write tempBuffer  0  tempBuffer Length                              using  var response   request GetResponse                                  Stream responseSReam   response GetResponseStream                    StreamReader streamReader   new StreamReader responseSReam                   return streamReader ReadToEnd                                    catch  WebException ex                        using  WebResponse response   ex Response                                HttpWebResponse httpResponse    HttpWebResponse response                  using  var streamReader   new StreamReader response GetResponseStream                         return streamReader ReadToEnd                                           write form id      public static void WriteFormData Dictionary lt string  object gt  dictionary  Stream stream  string mimeBoundary                string formdataTemplate     r n--    mimeBoundary                                         r nContent-Disposition  form-data  name    0     r n r n 1            if  dictionary    null                        foreach  string key in dictionary Keys                                string formitem   string Format formdataTemplate  key  dictionary key                    byte   formitembytes   System Text Encoding UTF8 GetBytes formitem                   stream Write formitembytes  0  formitembytes Length                                         write file      public static void WritefileToUpload FileInfo file  Stream stream  string mimeBoundary  string formkey                var boundarybytes   System Text Encoding ASCII GetBytes   r n--    mimeBoundary     r n            var endBoundaryBytes   System Text Encoding ASCII GetBytes   r n--    mimeBoundary    --             string headerTemplate    Content-Disposition  form-data  name    0     filename    1    r n                                     Content-Type  application octet-stream r n r n            stream Write boundarybytes  0  boundarybytes Length           var header   string Format headerTemplate  formkey  file Name           var headerbytes   System Text Encoding UTF8 GetBytes header            stream Write headerbytes  0  headerbytes Length            using  var fileStream   new FileStream file FullName  FileMode Open  FileAccess Read                         var buffer   new byte 1024               var bytesRead   0              while   bytesRead   fileStream Read buffer  0  buffer Length      0                                stream Write buffer  0  bytesRead                                   stream Write endBoundaryBytes  0  endBoundaryBytes Length

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It work for window phone 8 1  You can try this   Dictionary lt string  object gt   headerContents   new Dictionary lt string  object gt     const String  lineEnd     r n   const String  twoHyphens    --   const String  boundary            private async void UploadFile OnTap object sender  System Windows Input GestureEventArgs e       Uri serverUri   new Uri  http www myserver com Mp4UploadHandler   UriKind Absolute          string fileContentType    multipart form-data             byte    boundarybytes   Encoding UTF8 GetBytes  twoHyphens    boundary    lineEnd      byte    trailerbytes   Encoding UTF8 GetBytes  twoHyphens    boundary    twoHyphens    lineEnd      Dictionary lt string  object gt   headerContents   new Dictionary lt string  object gt        SetEndHeaders        to add some extra parameter if you need     httpWebRequest    HttpWebRequest WebRequest Create serverUri      httpWebRequest ContentType   fileContentType      boundary      boundary     httpWebRequest Method    POST      httpWebRequest AllowWriteStreamBuffering   false      get response after upload header part     var fileName   Path GetFileName MediaStorageFile Path          Stream fStream    await MediaStorageFile OpenAsync Windows Storage FileAccessMode Read   AsStream      MediaStorageFile is a storage file from where you want to upload the file of your device        string fileheaderTemplate    Content-Disposition  form-data  name    0        lineEnd    lineEnd     1      lineEnd         long httpLength   0     foreach  var headerContent in  headerContents     get the length of upload strem    httpLength     boundarybytes Length   Encoding UTF8 GetBytes string Format fileheaderTemplate  headerContent Key  headerContent Value   Length      httpLength     boundarybytes Length   Encoding UTF8 GetBytes  Content-Disposition  form-data  name   uploadedFile   filename       fileName           lineEnd  Length                                          Encoding UTF8 GetBytes  lineEnd  Length   2    trailerbytes Length     httpWebRequest ContentLength   httpLength   fStream Length      wait until you upload your total stream       httpWebRequest BeginGetRequestStream  result    gt               try                   HttpWebRequest request    HttpWebRequest result AsyncState           using  Stream stream   request EndGetRequestStream result                          foreach  var headerContent in  headerContents                               WriteToStream stream   boundarybytes                  WriteToStream stream  string Format fileheaderTemplate  headerContent Key  headerContent Value                                 WriteToStream stream   boundarybytes                WriteToStream stream   Content-Disposition  form-data  name   uploadedFile   filename       fileName           lineEnd                WriteToStream stream   lineEnd                 int bytesRead   0               byte   buffer   new byte 2048      upload 2K each time               while   bytesRead   fStream Read buffer  0  buffer Length      0                                stream Write buffer  0  bytesRead                  Array Clear buffer  0  2048      Clear the array                                 WriteToStream stream   lineEnd                 WriteToStream stream   trailerbytes                 fStream Close                        request BeginGetResponse a   gt               get response here             try                              var response   request EndGetResponse a                  using  Stream streamResponse   response GetResponseStream                   using  var memoryStream   new MemoryStream                                           streamResponse CopyTo memoryStream                      responseBytes   memoryStream ToArray        here I get byte response from server  you can change depends on server response                                    if  responseBytes Length  gt  0  amp  amp  responseBytes 0     1                   MessageBox Show  Uploading Completed                  else                   MessageBox Show  Uploading failed  please try again                               catch  Exception ex                              null                 catch  Exception ex                   fStream Close                                               httpWebRequest      private static void WriteToStream Stream s  string txt       byte   bytes   Encoding UTF8 GetBytes txt      s Write bytes  0  bytes Length        private static void WriteToStream Stream s  byte   bytes        s Write bytes  0  bytes Length        private void SetEndHeaders          headerContents Add  sId   LocalData currentUser SessionId       headerContents Add  uId   LocalData currentUser UserIdentity       headerContents Add  authServer   LocalData currentUser AuthServerIP       headerContents Add  comPort   LocalData currentUser ComPort

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Here is what worked for me while sending the file as mult-form data       public T HttpPostMultiPartFileStream lt T gt  string requestURL  string filePath  string fileName                string content   null           using  MultipartFormDataContent form   new MultipartFormDataContent                          StreamContent streamContent              using  var fileStream   new FileStream filePath  FileMode Open                                 streamContent   new StreamContent fileStream                    streamContent Headers Add  Content-Type    application octet-stream                    streamContent Headers Add  Content-Disposition   string Format  form-data  name   file    filename    0      fileName                    form Add streamContent   file   fileName                    using  HttpClient client   GetAuthenticatedHttpClient                                          HttpResponseMessage response   client PostAsync requestURL  form  GetAwaiter   GetResult                        content   response Content ReadAsStringAsync   GetAwaiter   GetResult                           try                                               return JsonConvert DeserializeObject lt T gt  content                                             catch  Exception ex                                                   Log the exception                                            return default T                                                     GetAuthenticatedHttpClient used above can be   private HttpClient GetAuthenticatedHttpClient         HttpClient httpClient   new HttpClient        httpClient BaseAddress   new Uri  lt yourBaseURL gt         httpClient DefaultRequestHeaders Add  Token   lt yourToken gt        return httpClient

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For people searching for 403 forbidden issue while trying to upload in multipart form the below might help as there is a case depending on the server configuration that you will get MULTIPART STRICT ERROR    eq 0  due to incorrect MultipartFormDataContent headers  Please note that both imagetag filename variables include quotations      eg filename    myfile png           MultipartFormDataContent form   new MultipartFormDataContent        ByteArrayContent imageContent   new ByteArrayContent fileBytes  0  fileBytes Length       imageContent Headers TryAddWithoutValidation  Content-Disposition    form-data  name   imagetag    filename   filename       imageContent Headers TryAddWithoutValidation  Content-Type    image   png        form Add imageContent  imagetag  filename

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I was also wanted to upload stuff to a Server and it was a Spring application i finally discovered that I needed to acctually set an content type for it to interpret it as a file  Just like this       MultipartFormDataContent form   new MultipartFormDataContent    var fileStream   new FileStream uniqueTempPathInProject  FileMode Open   var streamContent   new StreamContent fileStream   streamContent Headers ContentType new MediaTypeHeaderValue  application zip    form Add streamContent   file  fileName

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hi guys after one day searching on web finally i solve problem with below source code hope to help you       public UploadResult UploadFile string  fileAddress                HttpClient client   new HttpClient             MultipartFormDataContent form   new MultipartFormDataContent            HttpContent content   new StringContent  fileToUpload            form Add content   fileToUpload                   var stream   new FileStream fileAddress  FileMode Open                       content   new StreamContent stream           var fileName            content Headers ContentDisposition   new ContentDispositionHeaderValue  form-data                         Name    name               FileName   Path GetFileName fileAddress                                       form Add content           HttpResponseMessage response   null                     var url   new Uri  http   192 168 10 236 2000 api Upload2            response    client PostAsync url  form   Result

[c#] How to upload file to server with HTTP POST multipart/form-data?

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