Plack::...eHeaders(3)

💖 Plack::...eHeaders(3) — like, the whole vibe 💖

okay bestie, so this is a page from the User Contributed Perl Documentation, and it's about Plack::Middleware::RearrangeHeaders. that's a long name and yes we're gonna say it every time, no cap. ✨

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✨ NAME ✨

Plack::Middleware::RearrangeHeaders — it reorders your HTTP headers for buggy clients. that's it, that's the whole job. 💅

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🦋 SYNOPSIS 🦋

here's the look, fr fr:

use Plack::Builder;

my $app = sub {
    return [ 200, [
        'Last-Modified' => 'Wed, 23 Sep 2009 13:36:33 GMT',
        'Content-Type' => 'text/plain',
        'ETag' => 'foo bar',
    ], [ 'Hello Foo' ] ];
};

builder {
    enable "Plack::Middleware::RearrangeHeaders";
    $app;
};

like. that's it. you enable it in your builder block and it just does the thing. iconic. 👑

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🌸 DESCRIPTION 🌸

so Plack::Middleware::RearrangeHeaders sorts your HTTP headers based on "Good Practice", meaning literally this:

# "Good Practice" order of HTTP message headers:
#    - Response-Headers
#    - Entity-Headers

and why, you ask? because buggy clients exist. we're talking very old MSIE, or broken HTTP proxy servers. yes, those are real. yes, people still have to deal with them. 😭

and honestly? most clients today don't care about HTTP header order — and they shouldn't care, bestie. it's giving "who asked." but if you're being too pedantic, or you're stuck in one of those environments where you genuinely have to deal with buggy clients like the ones above, then this middleware might lowkey be useful for you. 🫶

not me defending header ordering in the year of our lord 2026 💀 but ok, some of y'all live in the legacy mines and I respect it.

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🎀 AUTHOR 🎀

Tatsuhiko Miyagawa — the icon who made this. 💜

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👑 SEE ALSO 👑

• HTTP::Headers — go look at it, it's right there.

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okay that's the whole page, you ate that. this was written up for perl v5.42.3, dated 2026-10-18, and it lives in the Plack::...eHeaders(3) corner of the User Contributed Perl Documentation. bye bestie, go reorder some headers 💖🎀🦋✨