Python 3.6 urllib TypeError：无法将字节连接到str

我正在尝试使用Python 3.6中的urllib从API中提取一些JSON数据。它要求传递标题信息以进行授权。这是我的代码：

import urllib.request,json

headers = {"authorization" : "Bearer {authorization_token}"}

with urllib.request.urlopen("{api_url}",data=headers) as url:
   data = json.loads(url.read().decode())
   print(data)

和我得到的错误信息：

TraceBACk (most recent call last):
  File "getter.py",line 5,in <module>
with urllib.request.urlopen("{url}",data=headers) as url:
   File "ApPDAta\Local\Programs\Python\Python36-32\lib\urllib\request.py",line 223,in urlopen
return opener.open(url,data,timeout)
  File "ApPDAta\Local\Programs\Python\Python36-32\lib\urllib\request.py",line 526,in open
response = self._open(req,data)
  File "ApPDAta\Local\Programs\Python\Python36-32\lib\urllib\request.py",line 544,in _open
'_open',req)
  File "ApPDAta\Local\Programs\Python\Python36-32\lib\urllib\request.py",line 504,in _call_chain
result = func(*args)
  File "ApPDAta\Local\Programs\Python\Python36-32\lib\urllib\request.py",line 1361,in https_open
context=self._context,check_hostname=self._check_hostName)
  File "ApPDAta\Local\Programs\Python\Python36-32\lib\urllib\request.py",line 1318,in do_open
encode_chunked=req.has_header('Transfer-encoding'))
  File "ApPDAta\Local\Programs\Python\Python36-32\lib\http\client.py",line 1239,in request
self._send_request(method,url,body,headers,encode_chunked)
  File "ApPDAta\Local\Programs\Python\Python36-32\lib\http\client.py",line 1285,in _send_request
self.endheaders(body,encode_chunked=encode_chunked)
  File "ApPDAta\Local\Programs\Python\Python36-32\lib\http\client.py",line 1234,in endheaders
self._send_output(message_body,line 1064,in _send_output
+ b'\r\n'
TypeError: can't concat bytes to str

Process finished with exit code 1

不太确定这里出了什么问题，我没有输入任何字节，所以我不确定为什么会收到错误消息，告诉我无法将字节连接到str。