[Python] Python flask server 405 error for a specific path when hosted on Azure, works fine...

I'm building a flask app to process images uploaded from a mobile device, before sending results back to the mobile app. I've successfully deployed the flask app on Azure, and can confirm it works with certain paths, /test for one.

The path my mobile app uses to upload an image, is /upload-data. When I run my flask app locally on my own PC and connect to it, this path works fine, accepting the image uploaded and returning a response.

However, when using the flask app deployed on Azure, the response I get for /upload-data is just 405 (Method not allowed).

This is the top part of my code in my python flask backend:

@app.route("/upload-data", methods=['POST'])
def store_data():
#Image processing code etc...


And this is how I make the post to the above path in my java android app with OkHTTP:

private void uploadData(String imagePath, String pointCloudPath) {
OkHttpClient client = new OkHttpClient.Builder()
.connectTimeout(10, TimeUnit.SECONDS)
.writeTimeout(10, TimeUnit.SECONDS)
.readTimeout(responseTimeOut, TimeUnit.SECONDS)
.build();
File imageFile = new File(imagePath);

//Create request body
RequestBody requestBody = new MultipartBody.Builder()
.setType(MultipartBody.FORM)
.addFormDataPart("image", imageFile.getName(),
RequestBody.create(imageFile, MediaType.parse("image/jpeg")))
.build();

//Create request itself
String url = "http://" + backendUrl;
Request request = new Request.Builder()
.url(url+"/upload-data")
.post(requestBody)
.build();

//Execute request in background
Log.d("OkHTTP Image Upload", "Creating image upload request to: " + request.url());
client.newCall(request).enqueue(new Callback() {
@Override
public void onFailure(@NonNull Call call, @NonNull IOException e) {
e.printStackTrace();
Log.e("OkHTTP Image Upload", "Failed: " + e.getMessage());
runOnUiThread(() -> textStatus.setText("Request Failed: " + e.getMessage()));
}
@Override
public void onResponse(@NonNull Call call, @NonNull Response response) {
if (response.isSuccessful()) {
Log.d("OkHTTP Upload", "Success");
InputStream responseZipStream = response.body().byteStream();
runOnUiThread(() -> processAnalysisResponse(responseZipStream));
}
else {
Log.e("OkHTTP Image Upload", "Error: "+response.code());
runOnUiThread(() -> textStatus.setText("Request Error: "+response.code()));
}
}
});
}

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