使用 Spotify API 时“解析 JSON 时出错”

Question

我正在学习 Python，并尝试使用 Spotify Web api 创建播放列表，但收到 http 400 错误：解析 json 时出错。我想这与令牌中不正确的变量类型有关，但我很难调试它，因为我无法找到一种方法来查看原始格式的发布请求。

通过 API 发布需要授权，这是我为此创建的脚本：

import requests
import base64
requests.packages.urllib3.disable_warnings()

client_id = 'ID'
client_secret = 'SECRET'
redirect_uri = 'http://spotify.com/'
scope = 'playlist-modify-private playlist-read-private'

def request_token():

    #  1. Your application requests authorization
    auth_url = 'https://accounts.spotify.com/authorize'
    payload = {'client_id': client_id, 'response_type':'code','redirect_uri':redirect_uri}
    auth = requests.get(auth_url,params = payload)
    print '\nPlease go to this url to authorize ', auth.url

    #  2. The user is asked to authorize access within the scopes
    #  3. The user is redirected back to your specified URI
    resp_url = raw_input('\nThen please copy-paste the url you where redirected to: ')
    resp_code= resp_url.split("?code=")[1].split("&")[0]

    #  4. Your application requests refresh and access tokens
    token_url = 'https://accounts.spotify.com/api/token'
    payload = {'redirect_uri': redirect_uri,'code': resp_code, 'grant_type': 'authorization_code','scope':scope}
    auth_header = base64.b64encode(client_id + ':' + client_secret)
    headers = {'Authorization': 'Basic %s' % auth_header}
    req = requests.post(token_url, data=payload, headers=headers, verify=True)
    response = req.json()

    return response

这是实际尝试使用授权令牌创建播放列表的函数（importauthorizer是上面的函数）：

import requests
import authorizer

def create_playlist(username, list_name):
    token = authorizer.request_token()
    access_token = token['access_token']
    auth_header = {'Authorization': 'Bearer {token}'.format(token=access_token), 'Content-Type': 'application/json'}
    api_url = 'https://api.spotify.com/v1/users/%s/playlists' % username
    payload = {'name': list_name, 'public': 'false'}
    r = requests.post(api_url, params=payload, headers=auth_header)

但无论我尝试什么，它只会导致 400 错误。有人可以在这里指出我的错误吗？

Answer 1

通过为输入添加 json.dumps 来解决：json.dumps(payload)并将请求中的有效负载更改为“data”而不是“params”。

所以新的功能请求等于：

r = requests.post(api_url, data=json.dumps(payload), headers=auth_header)