{"id":1530,"date":"2024-09-08T12:29:53","date_gmt":"2024-09-08T15:29:53","guid":{"rendered":"https:\/\/thiagorossi.com.br\/blog\/?p=1530"},"modified":"2025-11-25T16:00:48","modified_gmt":"2025-11-25T19:00:48","slug":"service-worker-pwa","status":"publish","type":"post","link":"https:\/\/thiagorossi.com.br\/blog\/service-worker-pwa\/","title":{"rendered":"Service Worker PWA"},"content":{"rendered":"<span class=\"span-reading-time rt-reading-time\" style=\"display: block;\"><span class=\"rt-label rt-prefix\">Tempo de leitura: <\/span> <span class=\"rt-time\"> 4<\/span> <span class=\"rt-label rt-postfix\">minutos<\/span><\/span>\n<p class=\"has-medium-font-size wp-block-paragraph\"><strong>Service Worker PWA<\/strong>: O <strong>Service Worker (SW)<\/strong> \u00e9 o pilar tecnol\u00f3gico mais crucial de um Progressive Web App (PWA). Trata-se de um <em>script<\/em> JavaScript que roda em segundo plano, <strong>separado da p\u00e1gina principal<\/strong> e atua como um <em>proxy<\/em> (intermedi\u00e1rio) entre o navegador e a rede.<\/p>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\">Ele \u00e9 o respons\u00e1vel por interceptar requisi\u00e7\u00f5es, gerenciar o cache e habilitar funcionalidades de aplicativos nativos, como o funcionamento <strong>offline<\/strong> e as <strong>Notifica\u00e7\u00f5es Push<\/strong>.<\/p>\n\n\n\n<div style=\"height:35px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h2 class=\"wp-block-heading has-large-font-size\">1. \ud83d\udcdd O Registro (Frontend &#8211; <code>index.html<\/code>)<\/h2>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\">O Service Worker deve ser explicitamente registrado pelo seu c\u00f3digo JavaScript na p\u00e1gina principal.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li class=\"has-medium-font-size\"><strong>Verifica\u00e7\u00e3o de Compatibilidade:<\/strong> O registro s\u00f3 pode ocorrer se o navegador do usu\u00e1rio suportar a API.<\/li>\n\n\n\n<li class=\"has-medium-font-size\"><strong>Escopo:<\/strong> O Service Worker s\u00f3 pode controlar as p\u00e1ginas que est\u00e3o sob seu caminho de arquivo. Se o <code>service-worker.js<\/code> estiver na raiz (<code>\/<\/code>), ele controla todo o site (<code>\/*<\/code>).<\/li>\n<\/ul>\n\n\n\n<div style=\"height:35px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h3 class=\"wp-block-heading has-medium-font-size\">C\u00f3digo de Registro (JavaScript no seu HTML)<\/h3>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\">JavaScript<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>if ('serviceWorker' in navigator) {\n  \/\/ Garante que o registro s\u00f3 ocorra ap\u00f3s o carregamento da p\u00e1gina\n  window.addEventListener('load', () =&gt; { \n    navigator.serviceWorker.register('\/service-worker.js', { scope: '\/' })\n      .then(registration =&gt; {\n        console.log('SW registrado. Escopo:', registration.scope);\n      })\n      .catch(error =&gt; {\n        console.error('Falha no registro do SW:', error);\n      });\n  });\n}\n<\/code><\/pre>\n\n\n\n<div style=\"height:35px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h2 class=\"wp-block-heading has-large-font-size\">2. \ud83d\udd01 O Ciclo de Vida do Service Worker<\/h2>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\">O SW passa por estados distintos que determinam quando ele pode ser usado. O desenvolvedor deve anexar l\u00f3gica a esses eventos.<\/p>\n\n\n\n<figure class=\"wp-block-table has-medium-font-size\"><table class=\"has-fixed-layout\"><thead><tr><td><strong>Evento\/Estado<\/strong><\/td><td><strong>A\u00e7\u00e3o<\/strong><\/td><td><strong>Prop\u00f3sito<\/strong><\/td><\/tr><\/thead><tbody><tr><td><strong><code>install<\/code><\/strong><\/td><td>Ocorre a primeira vez que o SW \u00e9 baixado e detectado.<\/td><td><strong>Pr\u00e9-caching:<\/strong> Ideal para armazenar ativos est\u00e1ticos essenciais (<em>offline shell<\/em>).<\/td><\/tr><tr><td><strong><code>activate<\/code><\/strong><\/td><td>Ocorre quando a nova vers\u00e3o do SW assume o controle da p\u00e1gina.<\/td><td><strong>Limpeza:<\/strong> Usado para apagar caches antigos de vers\u00f5es anteriores.<\/td><\/tr><tr><td><strong><code>fetch<\/code><\/strong><\/td><td>Ocorre para <strong>cada requisi\u00e7\u00e3o<\/strong> de rede feita pela p\u00e1gina controlada.<\/td><td><strong>Estrat\u00e9gias de Cache:<\/strong> Onde voc\u00ea decide buscar o recurso (Cache ou Rede).<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<div style=\"height:35px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h3 class=\"wp-block-heading\">A. O Evento <code>install<\/code> (SW Script)<\/h3>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\">Durante a instala\u00e7\u00e3o, usamos <code>event.waitUntil()<\/code> para garantir que o SW n\u00e3o seja instalado at\u00e9 que a Promise de abertura e preenchimento do cache seja resolvida com sucesso.<\/p>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\">JavaScript<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>const CACHE_NAME = 'cache-v1'; \/\/ Vers\u00e3o do Cache\nconst URLS_TO_CACHE = &#91;'\/', '\/index.html', '\/style.css', '\/app.js'];\n\nself.addEventListener('install', event =&gt; {\n  console.log('SW: Evento Install');\n  event.waitUntil(\n    caches.open(CACHE_NAME)\n      .then(cache =&gt; {\n        console.log('SW: Pr\u00e9-caching de assets...');\n        return cache.addAll(URLS_TO_CACHE);\n      })\n  );\n});\n<\/code><\/pre>\n\n\n\n<div style=\"height:35px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h3 class=\"wp-block-heading\">B. O Evento <code>activate<\/code> (SW Script)<\/h3>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\">\u00c9 onde a limpeza de caches antigos ocorre, geralmente comparando o <code>CACHE_NAME<\/code> atual com os nomes existentes.<\/p>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\">JavaScript<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>self.addEventListener('activate', event =&gt; {\n  console.log('SW: Evento Activate');\n  event.waitUntil(\n    caches.keys().then(cacheNames =&gt; {\n      return Promise.all(\n        cacheNames.map(cacheName =&gt; {\n          if (cacheName !== CACHE_NAME) {\n            console.log('SW: Deletando cache antigo:', cacheName);\n            return caches.delete(cacheName);\n          }\n        })\n      );\n    })\n  );\n});\n<\/code><\/pre>\n\n\n\n<div style=\"height:35px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h2 class=\"wp-block-heading\">3. \ud83d\udce1 O Evento <code>fetch<\/code> e Estrat\u00e9gias de Cache (SW Script)<\/h2>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\">O evento <code>fetch<\/code> \u00e9 a parte mais din\u00e2mica. Ele \u00e9 acionado para cada requisi\u00e7\u00e3o HTTP\/HTTPS. A l\u00f3gica aqui implementa a estrat\u00e9gia de cache (ex: <em>Cache First, Network Fallback<\/em>).<\/p>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\">JavaScript<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>self.addEventListener('fetch', event =&gt; {\n  \/\/ event.respondWith permite que o SW intercepte e responda\n  event.respondWith(\n    caches.match(event.request) \/\/ 1. Tenta encontrar a requisi\u00e7\u00e3o no cache\n      .then(response =&gt; {\n        \/\/ 2. Se a resposta existir no cache, retorna ela imediatamente (Cache First)\n        if (response) {\n          return response;\n        }\n        \n        \/\/ 3. Se n\u00e3o estiver no cache, busca na rede (Network Fallback)\n        return fetch(event.request);\n      })\n  );\n});\n<\/code><\/pre>\n\n\n\n<div style=\"height:35px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h2 class=\"wp-block-heading has-large-font-size\">\u2705 Conclus\u00e3o<\/h2>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\">Service Worker PWA: O Service Worker \u00e9 a tecnologia transformadora que permite aos PWAs oferecerem experi\u00eancias de n\u00edvel nativo. Seu comportamento \u00e9 definido pelo seu <strong>ciclo de vida<\/strong> e pelos eventos que ele gerencia. Ao registrar o SW no frontend e implementar a l\u00f3gica correta nos eventos <strong><code>install<\/code><\/strong> (para pr\u00e9-cache), <strong><code>activate<\/code><\/strong> (para limpeza) e <strong><code>fetch<\/code><\/strong> (para estrat\u00e9gias de cache), voc\u00ea constr\u00f3i a funda\u00e7\u00e3o para um aplicativo web r\u00e1pido, confi\u00e1vel e totalmente funcional, mesmo <em>offline<\/em>.<\/p>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\">Toda jornada tem um in\u00edcio, e o in\u00edcio para se tornar um desenvolvedor web \u00e9 dominar as seguintes tecnologias, que voc\u00ea encontra aqui mesmo:<\/p>\n\n\n\n<div class=\"wp-block-columns is-layout-flex wp-container-core-columns-is-layout-8f761849 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<figure class=\"wp-block-image size-full\"><a href=\"\/category\/html\"><img loading=\"lazy\" decoding=\"async\" width=\"758\" height=\"426\" src=\"https:\/\/thiagorossi.com.br\/blog\/wp-content\/uploads\/2024\/04\/html.webp\" alt=\"HTML\" class=\"wp-image-600\" srcset=\"https:\/\/thiagorossi.com.br\/blog\/wp-content\/uploads\/2024\/04\/html.webp 758w, https:\/\/thiagorossi.com.br\/blog\/wp-content\/uploads\/2024\/04\/html-300x169.webp 300w\" sizes=\"auto, (max-width: 758px) 100vw, 758px\" \/><\/a><figcaption class=\"wp-element-caption\">HTML<\/figcaption><\/figure>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<figure class=\"wp-block-image size-full\"><a href=\"\/category\/css\"><img loading=\"lazy\" decoding=\"async\" width=\"758\" height=\"426\" src=\"https:\/\/thiagorossi.com.br\/blog\/wp-content\/uploads\/2024\/04\/Capa-Artigos-Linux.webp\" alt=\"CSS\" class=\"wp-image-702\" srcset=\"https:\/\/thiagorossi.com.br\/blog\/wp-content\/uploads\/2024\/04\/Capa-Artigos-Linux.webp 758w, https:\/\/thiagorossi.com.br\/blog\/wp-content\/uploads\/2024\/04\/Capa-Artigos-Linux-300x169.webp 300w\" sizes=\"auto, (max-width: 758px) 100vw, 758px\" \/><\/a><figcaption class=\"wp-element-caption\">CSS<\/figcaption><\/figure>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<figure class=\"wp-block-image size-full\"><a href=\"\/category\/javascript\"><img loading=\"lazy\" decoding=\"async\" width=\"758\" height=\"426\" src=\"https:\/\/thiagorossi.com.br\/blog\/wp-content\/uploads\/2024\/04\/javascript.webp\" alt=\"Javascript\" class=\"wp-image-804\" srcset=\"https:\/\/thiagorossi.com.br\/blog\/wp-content\/uploads\/2024\/04\/javascript.webp 758w, https:\/\/thiagorossi.com.br\/blog\/wp-content\/uploads\/2024\/04\/javascript-300x169.webp 300w\" sizes=\"auto, (max-width: 758px) 100vw, 758px\" \/><\/a><figcaption class=\"wp-element-caption\">JavaScript<\/figcaption><\/figure>\n<\/div>\n<\/div>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\">E se voc\u00ea gosta do nosso conte\u00fado, n\u00e3o deixe de contribuir adquirindo os servi\u00e7os e produtos dos nossos apoiadores e empresas que somos associados:<\/p>\n\n\n\n<div class=\"wp-block-columns is-layout-flex wp-container-core-columns-is-layout-8f761849 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<figure class=\"wp-block-image size-full\"><a href=\"https:\/\/hostinger.com.br\/?REFERRALCODE=1THIAGO62\"><img loading=\"lazy\" decoding=\"async\" width=\"300\" height=\"250\" src=\"https:\/\/thiagorossi.com.br\/blog\/wp-content\/uploads\/2024\/03\/hostinger.png\" alt=\"Hospedagem Hostinger\" class=\"wp-image-92\"\/><\/a><\/figure>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<figure class=\"wp-block-image size-full\"><a href=\"https:\/\/amzn.to\/3SNDYlc\"><img loading=\"lazy\" decoding=\"async\" width=\"300\" height=\"250\" src=\"https:\/\/thiagorossi.com.br\/blog\/wp-content\/uploads\/2024\/08\/ofertas-amazon.webp\" alt=\"Ofertas Amazon\" class=\"wp-image-1308\"\/><\/a><\/figure>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<figure class=\"wp-block-image size-full\"><a href=\"https:\/\/amzn.to\/3SNKmt0\"><img loading=\"lazy\" decoding=\"async\" width=\"300\" height=\"250\" src=\"https:\/\/thiagorossi.com.br\/blog\/wp-content\/uploads\/2024\/08\/amazonprime.webp\" alt=\"Amazon Prime\" class=\"wp-image-1307\"\/><\/a><\/figure>\n<\/div>\n<\/div>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\"><\/p>\n","protected":false},"excerpt":{"rendered":"<p><span class=\"span-reading-time rt-reading-time\" style=\"display: block;\"><span class=\"rt-label rt-prefix\">Tempo de leitura: <\/span> <span class=\"rt-time\"> 4<\/span> <span class=\"rt-label rt-postfix\">minutos<\/span><\/span>Service Worker PWA: O Service Worker (SW) \u00e9 o pilar tecnol\u00f3gico mais crucial de um&#8230;<\/p>\n","protected":false},"author":1,"featured_media":1497,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[16],"tags":[],"class_list":["post-1530","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-pwa","wpcat-16-id"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Service Worker PWA - BLOG THIAGO ROSSI<\/title>\n<meta name=\"description\" content=\"Service Worker PWA: Neste artigo, vamos mergulhar a fundo no mundo dos service workers, explorando seus conceitos, funcionalidades e como ...\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/thiagorossi.com.br\/blog\/service-worker-pwa\/\" \/>\n<meta property=\"og:locale\" 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