Escape Cors Server

import json,os,base64
import urllib.request
from flask_cors import CORS,cross_origin
from flask import Flask,request,abort,jsonify

#POSTするURL設定
method = 'POST'
url = 'https://hogehoge'
headers = {'Content-Type' : 'application/json'}

#Access-Control-Allow-Originヘッダを追加
app = Flask(__name__)
cors = CORS(app)

@app.route('/',methods = ["GET","POST"])
@cross_origin()

def main():
    if request.method == 'GET':
        #URLエンコードで受け取った文字列をdecode
        req_url = urllib.parse.unquote(request.args.get('url')) 
        req_get = urllib.request.Request(req_url,method = 'GET')
        with urllib.request.urlopen(req_get) as response :
            return response.read()
    else :
        今回は = '省略' + 'します'

if __name__ == '__main__':
    port = int(os.getenv("PORT", 5000))
    app.run(host="0.0.0.0", port=port)