---
title: REST API - Using the Content-Type Multipart Method
slug: rm/rest-api-using-the-content-type-multipart-method
docTags: 
createdAt: 2026-06-09T13:38:46.116Z
---

You can use the Multipart method with the following requests:

- [REST API - Add Attachment Request](docId\:vhunQlItn6g7YA2f5EQzX)
- [REST API - Add Attachment to Subartifact Request](docId\:eGMczSNs7uZCiPG2ed9s7) 



To add data using the Multipart method, you must use boundary parameters for the data. For more information on using `MultipartContent`, see [http://www.w3.org/Protocols/rfc1341/7\_2\_Multipart.html](http://www.w3.org/Protocols/rfc1341/7_2_Multipart.html).

# Example in C\#

```swift
{  //Call REST API  var fetchRequest = (HttpWebRequest)WebRequest.Create(string.Concat(BaseURI, "/", APICall));                  fetchRequest.Headers.Add("Authorization", “BlueprintToken” + “ “ + authenticationToken);                                  fetchRequest.Accept = "application/xml";  fetchRequest.Method = "POST";  fetchRequest.KeepAlive = true;  fetchRequest.Credentials = System.Net.CredentialCache.DefaultCredentials;  //Start creating multipart boundary  string boundary = "---------------------------" + DateTime.Now.Ticks.ToString("x");  byte[] boundarybytes = System.Text.Encoding.ASCII.GetBytes("\r\n--" + boundary + "\r\n");  fetchRequest.ContentType = "multipart/form-data; boundary=" + boundary;  using (Stream rs = fetchRequest.GetRequestStream())  {  //Add starting boundary                      rs.Write(boundarybytes, 0, boundarybytes.Length);  //Add Content headers (content disposition header)  string headerTemplate = "Content-Disposition: form-data; name=\"{0}\"; filename=\"{1}\"\r\nContent-Type: {2}\r\n\r\n";  string header = string.Format(headerTemplate, paramName, file, contentType);  byte[] headerbytes = System.Text.Encoding.UTF8.GetBytes(header);  rs.Write(headerbytes, 0, headerbytes.Length);                      //Add file  using (var fileStream = new FileStream(file, FileMode.Open, FileAccess.Read))  {  var buffer = new byte[4096];  int bytesRead = 0;  while ((bytesRead = fileStream.Read(buffer, 0, buffer.Length)) != 0)  {  rs.Write(buffer, 0, bytesRead);  }  }  //Add last boundary  byte[] trailer = System.Text.Encoding.ASCII.GetBytes("\r\n--" + boundary + "--\r\n");  rs.Write(trailer, 0, trailer.Length);  }  //Send request  var webResponse = fetchRequest.GetResponse() as HttpWebResponse;                }
```