Plack::...ionalGET(3)

💖 Plack::Middleware::ConditionalGET 💖

okay bestie, so this page is from the User Contributed Perl Documentation for Plack::Middleware::ConditionalGET — and yes, that's a whole mouthful, so we're just gonna vibe with it. She's a middleware. She's serving conditional GET. She's lowkey iconic for it. 🎀

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✨ NAME ✨

Plack::Middleware::ConditionalGET — the middleware that turns on conditional GET for you, no cap. 💅

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🌸 SYNOPSIS 🌸

here's the whole entire flex, look at her:

builder {
    enable "ConditionalGET";
    ....
};

that's it. that's the setup. slip enable "ConditionalGET"; into your builder block and she's in the group chat. 🫶

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🦋 DESCRIPTION 🦋

okay so here's the tea ☕: this middleware enables conditional GET and conditional HEAD, using the If-None-Match and If-Modified-Since headers. two headers, two vibes, one middleware. ✨

the thing is, your app has to do its part too — she's not doing all the work for you, bestie. your application should set either or both of these response headers:

• Last-Modified
• ETag

...and it has to do that per RFC 2616, which is the rulebook here, so we respect her. 📜👑

then, when either of those conditions is met — [If-None-Match](.) or [If-Modified-Since](.) matching up — the plot twist hits:

• the response body gets set to zero length (empty, gone, nothing left 🫥)
• and the status gets set to 304 Not Modified

so the client just gets told "yeah babe nothing changed, we already gave you this 💅" and no bytes get wasted re-sending a body that's literally the same. obsessed. efficiency queen. 👑

just to be super clear, both of those things happen together: zero-length body and 304 Not Modified. that's the whole move. no cap. 🔥

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🌈 SEE ALSO 🌈

• Rack::ConditionalGet — the Ruby cousin, if you ever wanna see how the other half lives 🍓

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and that's the page!! mwah 💋 this was pulled from perl v5.42.3, dated 2026-10-18, living in the User Contributed Perl Documentation section, filed under Plack::...ionalGET(3) because even the title got shortened for the runway. slay. ✨💖🦋