new_contents: #! /usr/bin/env python
  # -*- coding: utf-8 -*-
  
  import json
  import requests
  import os.path
  
  def get_api_token():
      """read my api token
      """
      with open('E:\Dropbox\Bin\dropbox_api_token.txt') as f:
          token = f.readline().rstrip()
      #print "token='{}'".format(token)
      return token
  
  
  def download(url, filename=None):
      # https://www.dropbox.com/developers/documentation/http/documentation#files-save_url
  
      # curl -X POST https://api.dropboxapi.com/2/files/save_url \
      # --header "Authorization: Bearer " \
      # --header "Content-Type: application/json" \
      # --data "{\"path\": \"/a.txt\",\"url\": \"http://example.com/a.txt\"}"
  
      if not filename:
          filename = os.path.basename(url)
  
      apiurl = 'https://api.dropboxapi.com/2/files/save_url'
      token = get_api_token()
      print 'requesting download of', filename
      r = requests.post(apiurl, headers={ 
          "Authorization": 'Bearer %s' % token,
          "Content-Type": 'application/json'
       }, json={  # "json" instead of "data"
           'path' : '/%s' % filename,  # should start with a '/'
           'url': url
      })
      #r.raise_for_status()
      print 'r.status_code =', r.status_code
      # print 'r.headers =', r.headers
      # print 'r.encoding =', r.encoding
      # print 'r.url =', r.url
      print 'r.text =', r.text
      # if r.status_code==200:
      #     print 'r.json() =', r.json()
  
      # r.status_code = 200
      # r.headers = {'X-Content-Type-Options': 'nosniff', 'Content-Encoding': 'gzip', 'Transfer-Encoding': 'chunked', 'X-Server-Response-Time': '571', 'Vary': 'Accept-Encoding', 'Server': 'nginx', 'X-Envoy-Upstream-Service-Time': '579', 'Connection': 'keep-alive', 'X-Dropbox-Request-Id': '03665620068c9845c23a1cc92890f9dd', 'Pragma': 'no-cache', 'Cache-Control': 'no-cache', 
      # 'Date': 'Sun, 03 May 2020 15:07:10 GMT', 'X-Frame-Options': 'SAMEORIGIN', 'Content-Type': 'application/json'}
      # r.encoding = None
      # r.url = https://api.dropboxapi.com/2/files/save_url
      # r.text = {".tag": "async_job_id", "async_job_id": "2fzY2UcViSYAAAAAAAS9tg"}
      # r.json() = {u'.tag': u'async_job_id', u'async_job_id': u'2fzY2UcViSYAAAAAAAS9tg'}
  
  if __name__=="__main__":
  
      url='https://cdimage.debian.org/debian-cd/current-live/amd64/iso-hybrid/debian-live-10.3.0-amd64-standard.iso'
  
      download(url)
  
subject: add download url script