MultiPartParser support double quotes

[007]

Although the rfc2231 document does not indicate that values can be wrapped in double quotes. However, some third-party tools wrap the value in double quotation marks when wrapping HTTP requests (such as the filename of the file uploaded by PostmanCanary). This results in double quotes for the filename at the end of Django parsing.

Postman request body:

----------------------------677822685948106391633425
Content-Disposition: form-data; name="file"; filename="测试.txt"; filename*="UTF-8''%E6%B5%8B%E8%AF%95.txt"
Content-Type: text/plain

test
----------------------------677822685948106391633425--

django got filename is 测试.txt" not 测试.txt

This is not a bug of Django. But I suggest Django do some compatibility processing.

CPython is also compatible with this situation.
​https://hg.python.org/cpython/file/default/Lib/test/test_email/test_headerregistry.py

​https://github.com/django/django/pull/12485

[Carlton Gibson]

Thanks for the report. First glance at the PR looks reasonable.

[Carlton Gibson]

PR looks correct. Thank you.

[Carlton Gibson]

GitHub is momentarily dying on me. I have small edits to push. I will try again later.

[Mariusz Felisiak <felisiak.mariusz@…>]

In e65fea92:

Fixed #31293 -- Allowed MultiPartParser to handle double-quoted encoded headers.