New submission from Jon Ribbens <[email protected]>:
email.headers can wrap headers by putting a FWS as the very first thing in the
output:
>>> from email.header import Header
>>> Header("a" * 67, header_name="Content-ID").encode()
'\n aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa'
i.e. it produces headers that look like this:
Content-ID:
blah
It is unclear to me whether this is compliant with the spec, but there seems to
be little reason to do this, and good reason not to in that at the very least
Outlook does not understand such headers. (e.g. if you have an HTML email with
an inline image referenced by Content-ID then Outlook will not find it if the
Content-ID header is wrapped as above.)
----------
components: Library (Lib)
messages: 334594
nosy: jribbens
priority: normal
severity: normal
status: open
title: email.headers wraps headers badly
versions: Python 3.4, Python 3.5, Python 3.6, Python 3.7
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Python tracker <[email protected]>
<https://bugs.python.org/issue35863>
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