Demian Brecht added the comment:
> My feeling is that '' implies "present but empty" (so should have a
> content-length set to zero), whereas None implies "missing" (so should only
> have a content-length header set to zero if the method is expecting a body.
Although I understand your thinking here, I think that bodies that are either
None or empty string should be treated identically. Whether or not the
Content-Length header is set should be dependent on the method used.
>From a client standpoint, there’s no difference between sending a body with a
>value of None and an empty string (the latter will get further down the call
>stack, but no data is actually sent over the wire).
Likewise from the server standpoint, there is no functional difference between
a missing or empty body. However, there’s still the possibility of unexpected
behaviour due to the inclusion of a Content-Length header for a method not
expecting it.
In light of that, I think that HTTPConnection(‘example.com’).request(‘GET’,
‘/‘, ‘’) and HTTPConnection(‘example.com’).request(‘GET’, ‘/‘) should result in
identical headers with no Content-Length set.
If someone /really/ wants to set the Content-Length header for a method that
doesn’t expect it, they still have the ability to do so:
HTTPConnection(‘example.com’).request(‘GET’, ‘/‘, ‘’, {‘Content-Length’: 0}).
However, if the default behaviour is to include the Content-Length header for
an empty string, the user then has to change what they’re sending to be None
instead of empty string even though they should be functionally equivalent.
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<http://bugs.python.org/issue23539>
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