Not able to recreate a cURL POST request using okHTTP multipart-form data in Java for my android app

Question

I have tried for two days now to understand how to replicate a curl request for adding an image to my Craftar image recognition collection. I am able to create an Item, but the way to setup the multipart-data code has failed me. The Craftar only provides the cURL statement of how to Post an image file to attach it to a collection Item.

I have tried using RequestB.in and Postman to see what I can see in the message transfer to figure it out, but no combination of the okHTTP methods seems to do the trick. I'm stumped. I have tried both "image/png" and "application/octet-stream" as my MediaTypes. RequestB.in showed "application/octet-stream" when I used Postman to send it a test request. Below is what the message info it showed.

Here is the cURL statement I'm trying to replicate with Java.

curl -X POST ' https://my.craftar.net/api/v0/image/api_key=123456789abcdefghijk123456789abcdefghijk ' -F "item=/api/v0/item/d05924dde1784787a3d6b815e2b1cd69/" -F "file=@back_cover.jpg"

Here is my code:

        public class OkHttpHandler extends AsyncTask<String, Void, String> {

        OkHttpClient client = new OkHttpClient();

        @Override
        protected String doInBackground(String... params) {

            File storageDir = Environment.getExternalStoragePublicDirectory(
                    Environment.DIRECTORY_PICTURES);
            File file = new File("/storage/emulated/0/Pictures/BlissBotSenderImages/kaytiandkristoffer.jpg");
            RequestBody requestBody = new MultipartBody.Builder()
                    .setType(MultipartBody.FORM)
                    .addFormDataPart("item", "/api/v0/item/d05924dde1784787a3d6b815e2b1cd69/")
                    .addFormDataPart("file","kaytiandkristoffer.jpg",
                    (RequestBody.create (MEDIA_TYPE_PNG, file)))
                    .build();

            Request request = new Request.Builder()
                    .url(postImageUrl)
                    .post(requestBody)
                    .build();

            try {
                Response response = client.newCall(request).execute();
                return response.body().string();
            } catch (Exception e) {
                e.printStackTrace();
            }

Below are the RequestB.in successful Post from Postman message details:

---

FORM/POST PARAMETERS item: /api/v0/item/d05924dde1784787a3d6b815e2b1cd69/

HEADERS Cf-Ray: 3cdba305fb509b62-DFW

Via: 1.1 vegur

Cf-Visitor: {"scheme":"https"}

Content-Type: multipart/form-data; boundary=a11df5d0-f007-4d3a-9849-18fe334c532c

Accept-Encoding: gzip

Content-Length: 3509853

Total-Route-Time: 0

Cf-Connecting-Ip: 2001:5b0:42c4:2ae8:2954:59ea:a3e8:4787

X-Request-Id: 766063f7-c368-4467-b5ed-42776ac6f528

Host: requestb.in

Connection: close

Cf-Ipcountry: US

User-Agent: okhttp/3.9.1

Connect-Time: 1

RAW BODY --a11df5d0-f007-4d3a-9849-18fe334c532c Content-Disposition: form-data; name="item" Content-Length: 46

/api/v0/item/d05924dde1784787a3d6b815e2b1cd69/ --a11df5d0-f007-4d3a-9849-18fe334c532c Content-Disposition: form-data; name="file"; filename="kaytiandkristoffer.jpg" Content-Type: application/octet-stream Content-Length: 3509467

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Answer 1

as sometimes happens the problem lay elsewhere. somewhere along the line I accidentally inserted an extraneous character in the endpoint address. I fixed that and the above code works just find.