Martin Panter added the comment:
If you enable BytesWarning (python -b) you do get an error:
>>> urlopen(req, data)
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "/usr/lib/python3.5/urllib/request.py", line 162, in urlopen
return opener.open(url, data, timeout)
File "/usr/lib/python3.5/urllib/request.py", line 463, in open
req = meth(req)
File "/usr/lib/python3.5/urllib/request.py", line 1171, in do_request_
if not request.has_header('Content-type'):
File "/usr/lib/python3.5/urllib/request.py", line 356, in has_header
return (header_name in self.headers or
BytesWarning: Comparison between bytes and string
I believe the “urllib.request” module is only written with text (str) field
names in mind, not byte strings. Same for
http.client.HTTPConnection.request(headers=...). But the lower-level
HTTPConnection.putheader method has special code to handle byte strings:
<http://svn.python.org/view?view=revision&revision=58823>, although this is not
documented either.
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nosy: +martin.panter
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<http://bugs.python.org/issue29891>
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