Bug report

Bug description:

Description: According toRFC 9110, a recipient that parses a timestamp value in an HTTP field MUST accept all three HTTP-date formats. This includes the obsolete RFC 850 format, e.g.,Sunday, 06-Nov-94 08:49:37 GMT. However, the Python standard library modulehttp.cookies currently fails to parse this format, which leads to the cookie being discarded entirely.

Steps to Reproduce:

1. Attempt to parse a cookie with a date in the obsolete RFC 850 format using thehttp.cookies module.
2. Observe that the module fails to parse the date, resulting in the cookie being discarded.

Code Example:

importhttp.cookiescookie_string='example=value; expires=Sunday, 06-Nov-94 08:49:37 GMT'cookie=http.cookies.SimpleCookie()cookie.load(cookie_string)# The expected behavior is that the cookie's expiration date is correctly parsed.# However, the module fails to parse the date in the obsolete RFC 850 format,# resulting in the cookie being discarded.print(cookie['example'].get('expires'))

Expected Behavior:
Thehttp.cookies module should correctly parse the obsolete RFC 850 date format and retain the cookie.

Actual Behavior:
The module fails to parse the date, resulting in aKeyError and the cookie being discarded.

CPython versions tested on:

CPython main branch

Operating systems tested on:

Linux

Linked PRs

• gh-123401: Fix http.cookies module to support obsolete RFC 850 date format #123405
• [3.13] gh-123401: Fix http.cookies module to support obsolete RFC 850 date format (GH-123405) #127828
• [3.12] gh-123401: Fix http.cookies module to support obsolete RFC 850 date format (GH-123405) #127829