Chiamata upload --> da errore:

{StatusCode: 500, ReasonPhrase: 'Internal Server Error', Version: 1.1, Content: System.Net.Http.StreamContent, Headers:
{
  x-ratelimit-limit: 5
  x-ratelimit-remaining: 4
  access-control-allow-origin: *
  access-control-allow-headers: Cache-Control,X-reqed-With,x-requested-with
  content-security-policy: default-src 'self'
  x-content-type-options: nosniff
  Alt-Svc: clear
  Date: Fri, 29 Mar 2019 20:48:07 GMT
  Via: 1.1 google
  X-Powered-By: Express
  Content-Length: 1148
  Content-Type: text/html; charset=utf-8
}}