[issue36226] multipart/related header causes false positive StartBoundaryNotFoundDefect and MultipartInvariantViolationDefect

[Ned Deily]

Change by Ned Deily <nad at python.org>:


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nosy: +barry, maxking, r.david.murray

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue36226>
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