根据政策，S3 AWS无效。政策条件失败。["eq", "$content-type", "audio/wav"]

我正在尝试使用预设的URL将对象上传到S3

下面是我的python代码。(参考这个帖子 ：https://boto3.amazonaws.com/v1/documentation/api/latest/guide/s3-presigned-urls.html)

import json
URL = "https://exmaple.server-give-me-presigned-URLs"
r = requests.get(url = URL)
response = r.json()
print("debug type payload: ", type(response))
print("debug key: ", response.keys())
print("debug value: ", response["jsonresult"])
print("debug ", response["signedupload"]["fields"])
print("debug ", response["signedupload"]["url"])
print("url type ", type(response["signedupload"]["url"]))
with open("test-wav-file.wav", 'rb') as f:
    files = {'file': ("/test-wav-file.wav", f)}
    http_response = requests.post(response["signedupload"]["url"], data=response["signedupload"]["fields"], files=files)
print("File upload HTTP: ", http_response.text)
我在运行时得到了错误。
('File upload HTTP: ', u'<?xml version="1.0" encoding="UTF-8"?>\n<Error><Code>AccessDenied</Code><Message>Invalid according to Policy: Policy Condition failed: ["eq", "$content-type", "audio/wav"]</Message><RequestId>1TRNC1XPX4MCJPN6</RequestId><HostId>h/YdSUDuPeZhUU1TqAu1BZrCfyXKiNTYvisbvp3iaLcoLoriQPREnJI1LZp69hDE4kOWYSVog7A=</HostId></Error>')
但当我把头文件内容类型改为headers = {'Content-type': 'audio/wav'}
我得到了错误。
('File upload HTTP: ', u'<?xml version="1.0" encoding="UTF-8"?>\n<Error><Code>PreconditionFailed</Code><Message>At least one of the pre-conditions you specified did not hold</Message><Condition>Bucket POST must be of the enclosure-type multipart/form-data</Condition><RequestId>S86QYFG0AYTY26WQ</RequestId><HostId>lvxNkydNcuiwE/UVZY2xRMBoqk/BSUn7qathgXWSu3Fii8ZlVlKDkEjOotw4fmU3bfFgjYbsspE=</HostId></Error>')
那么我们是否有任何一种内容类型满足所有条件？请帮助我