cant upload files

```
// openai
// To use dotenv, you need to add the "io.github.cdimascio:dotenv-kotlin:version"
// dependency. Then you can add a .env file in your project directory.
//String key = Dotenv.load().get("OPENAI_TOKEN");
openai = OpenAI.builder()
.apiKey("API_KEY")
.build();

messages = new ArrayList<>();
messages.add(ChatMessage.toSystemMessage("Help the user with their problem."));

// Here you can change the model's settings, add tools, and more.
request = ChatRequest.builder()
.model("gpt-4o")
.messages(messages)
.build();
```
```
private byte[] downloadFile(String url) throws ClientProtocolException, IOException {
HttpGet request = new HttpGet(url.replace(" ", "%20"));
request.addHeader("sec-ch-ua",
"\" Not A;Brand\";v=\"99\", \"Chromium\";v=\"130\", \"Microsoft Edge\";v=\"130\"");
request.addHeader("X-Requested-With", "XMLHttpRequest");
request.addHeader("sec-ch-ua-mobile", "?0");
request.addHeader(
"User-Agent",
"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/130.0.0.0 Safari/537.36 Edg/130.0.0.0");
request.addHeader("sec-ch-ua-platform", "\"Windows\"");
request.addHeader("Origin", url); // to be fixed
request.addHeader("Sec-Fetch-Site", "same-origin");
request.addHeader("Sec-Fetch-Mode", "cors");
request.addHeader("Sec-Fetch-Dest", "empty");
request.addHeader("Referer", url);
request.addHeader("Accept-Language", "en-US,en;q=0.9");
request.addHeader("sec-gpc", "1");
DefaultHttpClient httpClient = new DefaultHttpClient();
request.addHeader(
"sec-ch-ua",
"\" Not A;Brand\";v=\"99\", \"Chromium\";v=\"100\", \"Microsoft Edge\";v=\"100\"");
request.addHeader("sec-ch-ua-mobile", "?0");
request.addHeader(
"User-Agent",
"Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/100.0.4863.0 Safari/537.36 Edg/100.0.1163.1");
CloseableHttpResponse response = httpClient.execute(request);
InputStream is = response.getEntity().getContent();
byte[] b = new byte[1024];
int r;
ByteArrayOutputStream baos = new ByteArrayOutputStream();
while ((r = is.read(b)) != -1) {
baos.write(Arrays.copyOf(b, r));
baos.flush();
}
baos.close();
return baos.toByteArray();
}
```
```
if (label.equalsIgnoreCase("chatgpt")) {
if (args.length == 0) {
sender.sendMessage('\r' + "Unknown translation key: command.unknown.argument");
sender.sendMessage('\r' + label + " " + String.join(" ", args)
+ "Unknown translation key: command.context.here");
return;
} else if (args[0].equalsIgnoreCase("upload") && args.length >= 2) {
String url = args[1];
String fn = url.substring(url.lastIndexOf("/") + 1, url.length());
System.out.println(fn);
byte[] b = null;
try {
b = downloadFile(url);
} catch (ClientProtocolException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
UploadFileRequest ufr = UploadFileRequest.builder().byteArray(fn, b).purpose(FilePurpose.ASSISTANTS).build();
FileObject fo = openai.files().upload(ufr);
System.out.println(fo);
return;
}
String input = String.join(" ", args);
messages.add(ChatMessage.toUserMessage(input));
ChatResponse response = openai.createChatCompletion(request);
sender.sendMessage('\r' + response.get(0).getMessage().getContent());
messages.add(response.get(0).getMessage());
}
```
when running command `chatgpt upload https://litter.catbox.moe/f4a2f1.jpg` it results in this error
```
java.io.IOException: Unexpected code Response{protocol=http/1.1, code=415, message=Unsupported Media Type, url=https://api.openai.com/v1/files}, received: {
"error": {
"message": "Invalid Content-Type header (application/json; charset=utf-8), expected multipart/form-data. (HINT: If you're using curl, you can pass -H 'Content-Type: multipart/form-data')",
"type": "invalid_request_error",
"param": null,
"code": null
}
}

at com.cjcrafter.openai.RequestHelper.executeRequest(RequestHelper.kt:66)
at com.cjcrafter.openai.RequestHelper.executeRequest(RequestHelper.kt:77)
at com.cjcrafter.openai.files.FileHandlerImpl.upload(FileHandlerImpl.kt:11)
```
and yes im fully aware im not doing my code right if i intend on actually using the uploaded file in the given chat thread to talk to gpt-4o, this is just a mere test of the file upload api for ChatGPT-Java-API which seems to be failing
`Invalid Content-Type header (application/json; charset=utf-8), expected multipart/form-data. (HINT: If you're using curl, you can pass -H 'Content-Type: multipart/form-data')` seems to be a error in ChatGPT-Java-API and not my code