title: How to upload image on server using Unirest library
body: <p>I am uploading image on server using Unirest library, but getting error like</p>
  
  <pre><code>{"code":400,"message":"Unknown content type [contentType=application/octet-stream]"}
  </code></pre>
  
  <p>My code is</p>
  
  <pre><code> Unirest.post(url).header("Content-Type", "multipart/form-data")                     .header("x-mysolomeo-session-key", "77e02e5c-bdac-4906-bb6c-90c6001b75a3.2017-03-03T17:15:10.101Z").field("token", "77e02e5c-bdac-4906-bb6c-90c6001b75a3")                     .field("documentType","Picture ID").field("documentImage", new File(new URI("file:///storage/emulated/0/logo.png"))).asString()
  </code></pre>
  
  <p>Can anyone help me on this ?</p>
  
  <p>Thanks in advance</p>