The Internet just changed.<\/a>, 24.07.2022 HTTP\/3<\/a> Head-of-Line-Blocking<\/a> What should happen if TCP packet 2 is lost in the network, but somehow packet 1 and packet 3 do arrive? Remember that TCP doesn\u2019t know it\u2019s carrying HTTP\/2, just that it needs to deliver data in-order. As such, it knows the contents of packet 1 are safe to use and passes those to the browser. However, it sees that there is a gap between the bytes in packet 1 and those in packet 3 (where packet 2 fits), and thus cannot yet pass packet 3 to the browser. TCP keeps packet 3 in its receive buffer until it receives the retransmitted copy of packet 2 (which takes at least 1 round-trip to the server), after which it can pass both to the browser in the correct order. Put differently: the lost packet 2 is HOL blocking packet 3!<\/p><\/blockquote>\n TCP usually isn\u2019t thought of to suffer from head-of-line blocking, however if you consider what head-of-line blocking is, then the following are likely to result in it occurring, or at least appearing to occur.<\/p>\n YouTube The Internet just changed., 24.07.2022 The QUIC Protocol, HTTP3, and How HTTP Has Evolved, 28.02.2022 HTTP\/2 Critical Limitation that led to HTTP\/3 & QUIC (Explained by Example), 04.05.2020 What are some problems with TCP?, 21.09.2016 Wikipedia HTTP\/3 Resource contention Head-of-line blocking Tutorials Head-of-Line-Blocking Head-of-line (HOL) blocking in HTTP\/1 and HTTP\/2 HTTP\/3 explained – TCP […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-13539","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"_links":{"self":[{"href":"https:\/\/blog.bachi.net\/index.php?rest_route=\/wp\/v2\/posts\/13539","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/blog.bachi.net\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/blog.bachi.net\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/blog.bachi.net\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/blog.bachi.net\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=13539"}],"version-history":[{"count":4,"href":"https:\/\/blog.bachi.net\/index.php?rest_route=\/wp\/v2\/posts\/13539\/revisions"}],"predecessor-version":[{"id":13543,"href":"https:\/\/blog.bachi.net\/index.php?rest_route=\/wp\/v2\/posts\/13539\/revisions\/13543"}],"wp:attachment":[{"href":"https:\/\/blog.bachi.net\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=13539"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blog.bachi.net\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=13539"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blog.bachi.net\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=13539"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}
\nThe QUIC Protocol, HTTP3, and How HTTP Has Evolved<\/a>, 28.02.2022
\nHTTP\/2 Critical Limitation that led to HTTP\/3 & QUIC (Explained by Example)<\/a>, 04.05.2020
\nWhat are some problems with TCP?<\/a>, 21.09.2016<\/p>\nWikipedia<\/h1>\n
\nResource contention<\/a>
\nHead-of-line blocking<\/a><\/p>\nTutorials<\/h1>\n
\nHead-of-line (HOL) blocking in HTTP\/1 and HTTP\/2<\/a>
\nHTTP\/3 explained – TCP Head-of-line blocking<\/a>
\nWhat is the head-of-line blocking that occurs in TCP?<\/a>
\nMicrosoft – An Optimal Solution to Head-of-Line Blocking<\/a> (PDF)
\nNETWORKING 101, CHAPTER 2 – Building Blocks of TCP<\/a>
\nHead-of-Line Blocking in QUIC and HTTP\/3: The Details<\/a><\/p>\n\n