title: OKHTTP 3 Tracking Multipart upload progress
body: <p>How can I track progress of upload in OkHttp 3
  I can find answers for v2 but not v3, like <a href="https://stackoverflow.com/questions/25962595/tracking-progress-of-multipart-file-upload-using-okhttp">this</a></p>
  
  <p>A sample Multipart request from OkHttp recipes</p>
  
  <pre><code>private static final String IMGUR_CLIENT_ID = "...";
  private static final MediaType MEDIA_TYPE_PNG = MediaType.parse("image/png");
  
  private final OkHttpClient client = new OkHttpClient();
  
  public void run() throws Exception {
      // Use the imgur image upload API as documented at https://api.imgur.com/endpoints/image
      RequestBody requestBody = new MultipartBody.Builder()
              .setType(MultipartBody.FORM)
              .addFormDataPart("title", "Square Logo")
              .addFormDataPart("image", "logo-square.png",
                      RequestBody.create(MEDIA_TYPE_PNG, new File("website/static/logo-square.png")))
              .build();
  
      Request request = new Request.Builder()
              .header("Authorization", "Client-ID " + IMGUR_CLIENT_ID)
              .url("https://api.imgur.com/3/image")
              .post(requestBody)
              .build();
  
      Response response = client.newCall(request).execute();
      if (!response.isSuccessful()) throw new IOException("Unexpected code " + response);
  
      System.out.println(response.body().string());
  }
  </code></pre>