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classification
Title: email.parser.BytesParser failed to parse mail when it is with BOM
Type: behavior Stage:
Components: Library (Lib) Versions: Python 3.9
process
Status: open Resolution:
Dependencies: Superseder:
Assigned To: Nosy List: tzing
Priority: normal Keywords:

Created on 2021-03-17 15:45 by tzing, last changed 2022-04-11 14:59 by admin.

Messages (1)
msg388929 - (view) Author: Tim Shih (tzing) Date: 2021-03-17 15:45 
Python's builtin `email.parser.BytesParser` could not properly parse the message when the bytes starts with BOM.

Not 100% ensured- but this issue seems cause by that `FeedParser._parsegen` could not match any of the header line after the data is decoded.

Steps to reproduce:
1. get email sample. any from https://github.com/python/cpython/tree/master/Lib/test/test_email/data. I use msg_01.txt in following code
2. re-encoded the mail sample to some encoding with BOM
3. use `email.parser.BytesParser` to parse it

```py
import email
with open('msg_01.txt', 'rb') as fp:
    msg = email.parser.BytesParser().parse(fp)
print(msg.get('Message-ID'))
```

Expect output `<15090.61304.110929.45684@aaa.zzz.org>`, got `None`
History
Date User Action Args
2022-04-11 14:59:42adminsetgithub: 87696
2021-03-17 15:45:56tzingcreate