[Bug 299084] libfetch: Localizes the "If-Modified-Since" header

From: <bugzilla-noreply_at_freebsd.org>
Date: Sat, 03 Oct 2026 09:34:58 UTC 
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=299084

            Bug ID: 299084
           Summary: libfetch: Localizes the "If-Modified-Since" header
           Product: Base System
           Version: 16.0-CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: bin
          Assignee: bugs@FreeBSD.org
          Reporter: arrowd@FreeBSD.org

libfetch uses strftime(.., "%a") to generate value for the "If-Modified-Since"
header. If the process that uses libfetch runs with non-English locale, the
HTTP request ends up looking like

GET /meta.conf HTTP/1.1
If-Modified-Since: сб, 26 сент. 2026 14:58:15 GMT

instead of

If-Modified-Since: Sat, 26 Sep 2026 14:58:15 GMT

I think libfetch clients should not bother cleaning the environment before
trying to fetch something?

Problem's context:
https://github.com/freebsd/pkg/issues/2742#issuecomment-5854328833

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