topic HTTP Utility Multipart in Product Forum

HTTP Utility Multipart

SireeshaJaggems — Thu, 29 Apr 2021 12:44:19 GMT

Hello Everyone,

I am using HTTP Utility Multipart VBO, to upload file to Web API(form-data). I am able to upload file, but file turns out to be blank after uploading . Iam passing Headers, URL and FileMetaData(filepath).Kindly , let me understand why the content is missing in the uploaded file.

Re: HTTP Utility Multipart

shashank.kumar280 — Thu, 06 May 2021 11:44:32 GMT

Hi Sireesha,

What is the response status that you get? Is it 200/201? Also have you already tried the same HTTP request from POSTMAN? Would you be able to share details on the request parameters and the API being used or any API documentation for the API that you are calling.

Re: HTTP Utility Multipart

PragatiPatnaik — Thu, 20 May 2021 06:01:24 GMT

@SireeshaJaggems : Even I have the same query(File is getting corrupted post uploading into application) too. Can you please share your solution if it is already resolved.
@shashank.kumar280 : Yes it is working fine in Postman for my solution. The status is 200 in Postman
.
Postman Details :

Accept: */*
Cache-Control: no-cache
Postman-Token: 4b24317d-edef-4ca5-bf97-c3767434b1,70ace7f6-f3dc-4876-ade9-c46de5b54fed
cookie: JSESSIONID=0000IypvyfzKGyD9J5oRV5R:1chgff5g
accept-encoding: gzip, deflate
content-type: multipart/form-data; boundary=--------------------------249786833778856564545
content-length: 260868
Connection: keep-alive
cache-control: no-cache
Content-Type: multipart/form-data; boundary=----WebKitFormBoundary7MA4YWxkTrZo7WV

Content-Disposition: form-data; name="uploadFile"; filename="/C:/Users/45078310/Desktop/1076595308.pdf

------WebKitFormBoundary7MA4YWxkTrZo7WV--

Re: HTTP Utility Multipart

SireeshaJaggems — Thu, 20 May 2021 06:32:37 GMT

@Pragati Patnaik

I couldn't find the resolution for the issue with the http VBO, so I developed below C# code to upload the files.

status = null;
string url = URL; // web api url
string file = FilePath; // path of file to upload
string paramName = "file";
// string contentType = "text/plain";

string username = null;
string password = null;
string boundary = "---------------------------" + DateTime.Now.Ticks.ToString("x");
byte[] boundarybytes = System.Text.Encoding.ASCII.GetBytes("\r\n--" + boundary + "\r\n");

HttpWebRequest wr = (HttpWebRequest)WebRequest.Create(url);

foreach (DataRow r in headers.Rows)
{
foreach (DataColumn c in headers.Columns)
{
string columnName = c.ColumnName;
string val = (r[columnName]).ToString();
wr.Headers.Add(columnName, val);
}
}

wr.Headers.Add("Authorization", "Basic");
wr.ContentType = "multipart/form-data; boundary=" + boundary;
wr.Method = "POST";
wr.KeepAlive = true;

Stream rs = wr.GetRequestStream();

string formdataTemplate = "Content-Disposition: form-data; name=\"{0}\"\r\n\r\n{1}";

rs.Write(boundarybytes, 0, boundarybytes.Length);

string headerTemplate = "Content-Disposition: form-data; name=\"{0}\"; filename=\"{1}\"\r\nContent-Type: {2}\r\n\r\n";

// var mimeType = MimeMapping.GetMimeMapping(file);
// contentType = MimeMapping.MimeUtility.GetMimeMapping(file);
// string mimeType = System.Web.MimeMapping.GetMimeMapping(file);

string filename = Path.GetFileName(file);
//contentType=MimeMapping.GetMimeMapping(filename);
string header = string.Format(headerTemplate, paramName, filename, 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);
status = "success";
//log.Debug(string.Format("File uploaded, server response is: {0}", reader2.ReadToEnd()));
}
catch (WebException ex)
{
using (var stream = ex.Response.GetResponseStream())
using (var reader = new StreamReader(stream))
{
status = reader.ReadToEnd();
}

if (wresp != null)
{
wresp.Close();
wresp = null;
}
}
finally
{
wr = null;
}

Hope this helps.

Re: HTTP Utility Multipart

shashank.kumar280 — Thu, 20 May 2021 07:00:41 GMT

@Pragati Patnaik Could you confirm what parameters were passed in FileMetadata collection and FieldMetadata collection?