detectron2 web app get and post image in flask

flask_post_get_image.py

import io
from flask import Flask, render_template, request, send_from_directory, send_file
from PIL import Image
import requests
import os

# function to load img from url
def load_image_url(url):
	response = requests.get(url)
	img = Image.open(io.BytesIO(response.content))
	return img

@app.route("/detect", methods=['POST', 'GET'])
def upload():
	if request.method == 'POST':

		try:

			# open image
			file = Image.open(request.files['file'].stream)

			# remove alpha channel
			rgb_im = file.convert('RGB')
			rgb_im.save('file.jpg')
		
		# failure
		except:

			return render_template("failure.html")

	elif request.method == 'GET':

		# get url
		url = request.args.get("url")

		# save
		try:
			# save image as jpg
			# urllib.request.urlretrieve(url, 'file.jpg')
			rgb_im = load_image_url(url)
			rgb_im = rgb_im.convert('RGB')
			rgb_im.save('file.jpg')

		# failure
		except:
			return render_template("failure.html")

	return send_file(rgb_im, mimetype='image/jpeg')