{"id":182,"date":"2014-10-31T06:20:39","date_gmt":"2014-10-31T06:20:39","guid":{"rendered":"http:\/\/anexia-www-3-blog.dev.anx-cus.net\/?p=182"},"modified":"2022-04-19T14:30:14","modified_gmt":"2022-04-19T12:30:14","slug":"english-the-tale-of-lighttpd-not-sending-the-last-modified-header","status":"publish","type":"post","link":"https:\/\/anexia.com\/blog\/de\/english-the-tale-of-lighttpd-not-sending-the-last-modified-header\/","title":{"rendered":"Die Geschichte von lighttpd und dem Last-Modified-Header"},"content":{"rendered":"<p>W\u00e4hrend ich gestern unseren neuen \u00f6ffentlichen Debian Mirror (<a title=\"debian.anexia.at\" href=\"http:\/\/debian.anexia.at\/\" target=\"_blank\" rel=\"noopener\">http:\/\/debian.anexia.at\/<\/a>) einigen Tests unterzog, bemerkte ich, dass mein System die <em>Packages.gz<\/em> Dateien jedes mal neu downloadete, sobald ich ein <em>apt-get update<\/em> machte.<\/p>\n<p>Das war nicht, was ich erwartet hatte und mein erster Verdacht, dass ein Konfigurationsfehler unsererseits die Ursache dieses Verhaltens\u00a0war, w\u00fcrde sich best\u00e4tigen.<\/p>\n<p>Wie schon der Titel dieses Eintrags verr\u00e4t, war der Grund, warum apt-get die Package-Liste jedes Mal neu gedownloadet hat, ein fehlender Last-Modified Header auf Serverseite.<\/p>\n<p><!--more--><\/p>\n<p>Nachdem ich eine ganze Weile versucht hatte zu debuggen, ohne wirklich etwas zu finden, \u00f6ffnete\u00a0ich den lighttpd Quellcode (mit apt-get source lighttpd \u2013 welches mir Version 1.4.31-4 brachte) und begann zu suchen.<\/p>\n<p>Nach f\u00fcnf Minuten stie\u00df ich auf ein interessantes St\u00fcck Code in mod_staticfile.c von lighttpd 1.4.31, Zeile 449.<\/p>\n<p>Ohne nun den Code selbst anzuf\u00fchren ist die Kurzversion dessen, was ich dort vorgefunden habe, folgendes: wenn der Content-Type NULL ist, dann setze den Content-Type auf &#8222;application\/octet-stream&#8220; und <strong>deaktiviere Caching<\/strong>.<\/p>\n<p>In diesem Fall f\u00fchrt die Deaktivierung von Caching dazu, dass sowohl ETag, als auch Last-Modified weder berechnet, noch mit der HTTP Response\u00a0gesendet werden.<\/p>\n<p>Aber wie l\u00e4sst sich das beheben? Es gibt einige Ans\u00e4tze, da\u00a0lighttpd unter Debian die Datei\u00a0<em>\/etc\/mime.types<\/em>\u00a0auswertet. Eine L\u00f6sung die f\u00fcr absolut jede Datei funktioniert ist, einen Fall-Back-Wert in der Konfigurationsdatei zu definieren.<\/p>\n<p>Warum? Weil dann der Content-Type nicht NULL ist, wenn er abgefragt wird.<\/p>\n<p>tl;dr:<\/p>\n<p>Langer Rede kurzer Sinn, die L\u00f6sung des Problems war, diese drei Zeilen am Ende unserer <em>lighttpd.conf<\/em> anzuf\u00fcgen:<\/p>\n<blockquote><p>mimetype.assign += (<\/p>\n<p>&#8222;&#8220; =&gt; &#8222;application\/octet-stream&#8220;<\/p>\n<p>)<\/p><\/blockquote>\n","protected":false},"excerpt":{"rendered":"<p>Wie schon der Titel verr\u00e4t, war der Grund, warum apt-get die Package-Liste immer neu heruntergeladen hat, ein fehlender Last-Modified Header auf Serverseite.<\/p>\n","protected":false},"author":5,"featured_media":205,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[10],"tags":[36,31,35,32],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v22.2 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Die Geschichte von lighttpd und dem Last-Modified-Header - ANEXIA Blog<\/title>\n<meta name=\"description\" content=\"Wie schon der Titel verr\u00e4t, war der Grund, warum apt-get die Package-Liste immer neu heruntergeladen hat, ein fehlender Last-Modified Header auf Serverseite.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/anexia.com\/blog\/de\/english-the-tale-of-lighttpd-not-sending-the-last-modified-header\/\" \/>\n<meta property=\"og:locale\" content=\"de_DE\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Die Geschichte von lighttpd und dem Last-Modified-Header - 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