[New-bugs-announce] [issue28262] Header folder folds incorrectly causing MissingHeaderBodySeparatorDefect

[Vincent Vanlaer]

New submission from Vincent Vanlaer:

Example:

X-Report-Abuse:
 =?us-ascii?q?=3Chttps=3A=2F=2Fwww=2Emailitapp=2Ecom=2Freport=5Fabuse=2Ephp=3Fmid=3Dxxx-xxx-xxxx?=
 =?us-ascii?q?xxxxxxxxxxxxxxxxxxxx=3D=3D-xxx-xx-xx=3E?=

When this header is parsed and reencoded as bytes using policy.default, the result is this:

X-Report-Abuse: <https://www.mailitapp.com/report_abuse.php?mid=xxx-xxx-xxxx
xxxxxxxxxxxxxxxxxxxx==-xxx-xx-xx>

Since the header does not require its value to be an encoded word, it is written as plain text. This removes the FWS between the encoded words. However, it appears that it is still seen as a, now invalid, folding point. When an email with this header is parsed again, it causes a MissingHeaderBodySeparatorDefect

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components: email
messages: 277299
nosy: barry, r.david.murray, vincenttc
priority: normal
severity: normal
status: open
title: Header folder folds incorrectly causing MissingHeaderBodySeparatorDefect
type: behavior
versions: Python 3.4, Python 3.5, Python 3.6

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue28262>
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