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我尝试用Python用POST方式实现语音合成

headers = {"Content-type":"application/x-www-form-urlencoded","Accept":"text/plain"}

params = urllib.parse.urlencode({'@tex': '你好', '@cuid': '0026C64B35C4', '@ctp':1,'@tok':'{"access_token":"24..........92000}'})

conn = http.client.HTTPConnection("http://tsn.baidu.com/text2audio",80)

conn.request("POST", "", params, headers)

...

脚本运行后，conn.request("POST", "", params, headers) 这一行报以下错误

for res in _socket.getaddrinfo(host, port, family, type, proto, flags):

socket.gaierror: [Errno 11004] getaddrinfo failed

不知道为什么会失败？