{"id":994,"date":"2025-12-29T08:40:19","date_gmt":"2025-12-29T07:40:19","guid":{"rendered":"https:\/\/mybox.com\/help\/?post_type=manual_kb&#038;p=994"},"modified":"2026-06-09T10:44:20","modified_gmt":"2026-06-09T08:44:20","slug":"what-is-http-3","status":"publish","type":"manual_kb","link":"https:\/\/mybox.com\/help\/en\/knowledgebase\/what-is-http-3\/","title":{"rendered":"What Is HTTP\/3?"},"content":{"rendered":"\n<div class=\"translation-block translation-block-merged\">\n<p class=\"wp-block-paragraph\">HTTP\/3 is the latest major version of the Hypertext Transfer Protocol (HTTP), the protocol used to transfer data between web browsers and web servers.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">It was designed to improve website performance, reduce connection delays, and provide a more reliable browsing experience, particularly on mobile and unstable network connections.<\/p>\n\n\n\n<\/div>\n\n<div id=\"mybox-1752987415\" class=\"mybox-content mybox-entity-placement\"><div class=\"early-access-banner-inpost\">\r\n  <div class=\"banner-left-inpost\">\r\n    <div class=\"icon-box-inpost\">\r\n      <img decoding=\"async\" src=\"https:\/\/mybox.com\/help\/wp-content\/uploads\/2026\/02\/square-info-icon.svg\" alt=\"Info\">\r\n    <\/div>\r\n    <div class=\"text-box-inpost\">\r\n      <span class=\"label-inpost\"><span class=\"translation-block translation-block-banner-text\">Early access<\/span><\/span>\r\n      <h4><span class=\"translation-block translation-block-banner-text\">Still need help?<\/span><\/h4>\r\n      <p><span class=\"translation-block translation-block-banner-text\">Contact our customer service team.<\/span><\/p>\r\n    <\/div>\r\n  <\/div>\r\n\r\n  <div class=\"banner-right-inpost\">\r\n    <a href=\"https:\/\/panel.mybox.com\/helpdesk2\/v\/list\/\" class=\"banner-button-inpost\"><span class=\"translation-block translation-block-banner-text\">Message us<\/span><\/a>\r\n  <\/div>\r\n<\/div><\/div>\n\n<div class=\"translation-block translation-block-merged\"><p class=\"wp-block-paragraph\">Unlike previous versions of HTTP, HTTP\/3 is built on the QUIC transport protocol instead of TCP.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_86 ez-toc-wrap-left counter-hierarchy ez-toc-counter ez-toc-custom ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Table of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/mybox.com\/help\/en\/knowledgebase\/what-is-http-3\/#Why_HTTP3_Was_Introduced\" >Why HTTP\/3 Was Introduced<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/mybox.com\/help\/en\/knowledgebase\/what-is-http-3\/#How_HTTP3_Works\" >How HTTP\/3 Works<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/mybox.com\/help\/en\/knowledgebase\/what-is-http-3\/#Key_Features_of_HTTP3\" >Key Features of HTTP\/3<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/mybox.com\/help\/en\/knowledgebase\/what-is-http-3\/#QUIC_Transport_Protocol\" >QUIC Transport Protocol<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/mybox.com\/help\/en\/knowledgebase\/what-is-http-3\/#Multiplexing\" >Multiplexing<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/mybox.com\/help\/en\/knowledgebase\/what-is-http-3\/#Built-In_Encryption\" >Built-In Encryption<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/mybox.com\/help\/en\/knowledgebase\/what-is-http-3\/#Connection_Migration\" >Connection Migration<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/mybox.com\/help\/en\/knowledgebase\/what-is-http-3\/#HTTP3_vs_HTTP2\" >HTTP\/3 vs. HTTP\/2<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/mybox.com\/help\/en\/knowledgebase\/what-is-http-3\/#Benefits_of_HTTP3\" >Benefits of HTTP\/3<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/mybox.com\/help\/en\/knowledgebase\/what-is-http-3\/#Faster_Page_Loading\" >Faster Page Loading<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/mybox.com\/help\/en\/knowledgebase\/what-is-http-3\/#Better_Mobile_Performance\" >Better Mobile Performance<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"https:\/\/mybox.com\/help\/en\/knowledgebase\/what-is-http-3\/#Improved_Reliability\" >Improved Reliability<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-13\" href=\"https:\/\/mybox.com\/help\/en\/knowledgebase\/what-is-http-3\/#Enhanced_Security\" >Enhanced Security<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-14\" href=\"https:\/\/mybox.com\/help\/en\/knowledgebase\/what-is-http-3\/#Practical_Implications\" >Practical Implications<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-15\" href=\"https:\/\/mybox.com\/help\/en\/knowledgebase\/what-is-http-3\/#Summary\" >Summary<\/a><\/li><\/ul><\/nav><\/div>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Why_HTTP3_Was_Introduced\"><\/span>Why HTTP\/3 Was Introduced<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Earlier versions of HTTP relied on the TCP transport protocol.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">While TCP is reliable, it can introduce delays when packets are lost or network conditions are poor.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">HTTP\/3 was created to address these limitations by using QUIC, a protocol designed to improve connection performance and reduce latency.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"How_HTTP3_Works\"><\/span>How HTTP\/3 Works<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">HTTP\/3 uses QUIC, which operates over UDP instead of TCP.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">This allows connections to recover more efficiently from packet loss and network interruptions.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">As a result, websites can often load faster and maintain more stable connections, especially on mobile networks or congested internet connections.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Key_Features_of_HTTP3\"><\/span>Key Features of HTTP\/3<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"QUIC_Transport_Protocol\"><\/span>QUIC Transport Protocol<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">QUIC is the foundation of HTTP\/3 and provides faster connection establishment and improved resilience to network issues.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Multiplexing\"><\/span>Multiplexing<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">HTTP\/3 allows multiple requests and responses to be transferred simultaneously over a single connection.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">This helps reduce delays when loading websites that contain many resources.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Built-In_Encryption\"><\/span>Built-In Encryption<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">HTTP\/3 requires encrypted connections using TLS.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">This helps protect data transferred between browsers and servers.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Connection_Migration\"><\/span>Connection Migration<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">HTTP\/3 can maintain active connections even when a device changes networks, such as switching from Wi-Fi to mobile data.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"HTTP3_vs_HTTP2\"><\/span>HTTP\/3 vs. HTTP\/2<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>HTTP\/3 \u2260 HTTP\/2<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Both protocols improve website performance compared to older HTTP versions, but they use different transport technologies.<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Feature<\/th><th>HTTP\/2<\/th><th>HTTP\/3<\/th><\/tr><\/thead><tbody><tr><td>Transport Protocol<\/td><td>TCP<\/td><td>QUIC (UDP-based)<\/td><\/tr><tr><td>Multiplexing<\/td><td>Yes<\/td><td>Yes<\/td><\/tr><tr><td>TLS Encryption<\/td><td>Supported<\/td><td>Required<\/td><\/tr><tr><td>Improved Packet Loss Handling<\/td><td>Limited<\/td><td>Improved<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">The most significant difference is that HTTP\/3 uses QUIC instead of TCP.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Benefits_of_HTTP3\"><\/span>Benefits of HTTP\/3<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Faster_Page_Loading\"><\/span>Faster Page Loading<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Reduced connection latency can improve loading speeds, particularly on slower or unstable networks.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Better_Mobile_Performance\"><\/span>Better Mobile Performance<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">HTTP\/3 is designed to handle changing network conditions more efficiently.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Improved_Reliability\"><\/span>Improved Reliability<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Packet loss and temporary network interruptions have less impact on performance.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Enhanced_Security\"><\/span>Enhanced Security<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Encrypted communication is mandatory in HTTP\/3 implementations.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Practical_Implications\"><\/span>Practical Implications<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Website visitors do not need to configure anything to use HTTP\/3.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">If both the browser and web server support the protocol, the connection can automatically use HTTP\/3.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The performance improvement varies depending on factors such as network quality, website design, server configuration, and geographic distance between the visitor and the server.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Summary\"><\/span>Summary<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">HTTP\/3 is the latest version of the HTTP protocol and is designed to improve the speed, reliability, and security of web communication. By using the QUIC transport protocol instead of TCP, HTTP\/3 can reduce latency and improve performance, particularly on mobile and unstable network connections.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n<\/div>\n","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"template":"","format":"standard","manualknowledgebasecat":[25],"manual_kb_tag":[858,859,850,851,852,853,854,855,856,857],"class_list":["post-994","manual_kb","type-manual_kb","status-publish","format-standard","hentry","manualknowledgebasecat-hosting","manual_kb_tag-server-push","manual_kb_tag-persistent-connections","manual_kb_tag-http","manual_kb_tag-quic","manual_kb_tag-hypertext-transfer-protocol","manual_kb_tag-user-datagram-protocol","manual_kb_tag-transport-layer-security","manual_kb_tag-zerortt","manual_kb_tag-multiplexing","manual_kb_tag-header-compression"],"_links":{"self":[{"href":"https:\/\/mybox.com\/help\/en\/wp-json\/wp\/v2\/manual_kb\/994","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/mybox.com\/help\/en\/wp-json\/wp\/v2\/manual_kb"}],"about":[{"href":"https:\/\/mybox.com\/help\/en\/wp-json\/wp\/v2\/types\/manual_kb"}],"author":[{"embeddable":true,"href":"https:\/\/mybox.com\/help\/en\/wp-json\/wp\/v2\/users\/1"}],"version-history":[{"count":3,"href":"https:\/\/mybox.com\/help\/en\/wp-json\/wp\/v2\/manual_kb\/994\/revisions"}],"predecessor-version":[{"id":4765,"href":"https:\/\/mybox.com\/help\/en\/wp-json\/wp\/v2\/manual_kb\/994\/revisions\/4765"}],"wp:attachment":[{"href":"https:\/\/mybox.com\/help\/en\/wp-json\/wp\/v2\/media?parent=994"}],"wp:term":[{"taxonomy":"manualknowledgebasecat","embeddable":true,"href":"https:\/\/mybox.com\/help\/en\/wp-json\/wp\/v2\/manualknowledgebasecat?post=994"},{"taxonomy":"manual_kb_tag","embeddable":true,"href":"https:\/\/mybox.com\/help\/en\/wp-json\/wp\/v2\/manual_kb_tag?post=994"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}