Flask request.form too slow when getting image from android studio

Question

I am running my Flask app on Ubuntu VPS (linode) as server. I am capturing image from android studio sending it to flask server to get response. Image is being sent as base64 string from android studio. But the response is too slow when using request.form.to_dict(). Both ubuntu vps and android app are running on different IP. I've put timestamps on different processes and found this request.form.to_dict() is the problem taking around 22 to 35 secs. I am also using image compressing techniques on my android studio code but still too much time.

• Tried on gunicorn with nginx but same.
• threaded = True
• Images are of around 400kb to 500kb size.

Kindly help me to figure out this issue.

Below is my flask code:

@app.route('/predict', methods=['POST', 'GET'])
def predict():

    if request.method == 'POST':
        file = request.form.to_dict()['upload']     # 22.2491 sec
        b64_string = file
        image = imread(io.BytesIO(base64.b64decode(b64_string)))   #0.0023 sec
        image = cv2.cvtColor(np.array(image), cv2.COLOR_BGR2RGB)   # 0.000171 sec
        .....
        .....
        .....

Answer 1

sending the images in base64 format is not the recommended method, you should try to send the photo via a multipart request. Look here to see how to send an image from android in multipart form data (if you are using java).

If you send the images via multipart form data you will then be able to access them on flask using the method request.files['my_file_name']:

@app.route('/upload', methods=['POST'])
def upload_file():
  my_file = request.files['my_file_name']: