{"id":1535,"date":"2024-09-11T11:41:51","date_gmt":"2024-09-11T14:41:51","guid":{"rendered":"https:\/\/thiagorossi.com.br\/blog\/?p=1535"},"modified":"2025-11-25T16:07:43","modified_gmt":"2025-11-25T19:07:43","slug":"cache-pwa","status":"publish","type":"post","link":"https:\/\/thiagorossi.com.br\/blog\/cache-pwa\/","title":{"rendered":"Cache 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>Cache PWA<\/strong>: O <strong>armazenamento em cache<\/strong> \u00e9 o que transforma um website comum em um <strong>Progressive Web App (PWA)<\/strong> confi\u00e1vel. Em vez de depender exclusivamente da rede, o PWA salva c\u00f3pias de seus recursos (assets) diretamente no dispositivo do usu\u00e1rio.<\/p>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\">Essa capacidade \u00e9 fundamental para alcan\u00e7ar o princ\u00edpio de <strong>Confiabilidade (<em>Reliable<\/em>)<\/strong>, garantindo que o aplicativo carregue e funcione <em>instantaneamente<\/em>, mesmo com a conex\u00e3o ausente ou inst\u00e1vel (o chamado <em>offline-first<\/em>).<\/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\udce6 Fundamentos da Cache API<\/h2>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\">A API utilizada pelo Service Worker para gerenciar recursos chama-se <strong>Cache API<\/strong>. Ela \u00e9 um armazenamento chave-valor onde a <strong>chave<\/strong> \u00e9 o objeto <code>Request<\/code> (ou URL) e o <strong>valor<\/strong> \u00e9 o objeto <code>Response<\/code>.<\/p>\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. Quando o Cache Ocorre<\/h3>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\">Existem dois momentos principais para armazenar recursos em cache:<\/p>\n\n\n\n<ol start=\"1\" class=\"wp-block-list\">\n<li class=\"has-medium-font-size\"><strong>Pr\u00e9-caching (Evento <code>install<\/code>):<\/strong> Armazenar ativos est\u00e1ticos cr\u00edticos imediatamente ap\u00f3s a instala\u00e7\u00e3o do Service Worker. Essencial para o &#8220;App Shell&#8221; (<em>offline shell<\/em>).<\/li>\n\n\n\n<li class=\"has-medium-font-size\"><strong>Runtime Caching (Evento <code>fetch<\/code>):<\/strong> Armazenar ativos sob demanda, conforme o usu\u00e1rio os solicita pela primeira vez. Ideal para imagens din\u00e2micas ou p\u00e1ginas que n\u00e3o s\u00e3o cr\u00edticas no in\u00edcio.<\/li>\n<\/ol>\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. Download e Armazenamento<\/h3>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\">O Service Worker gerencia a Cache API atrav\u00e9s de m\u00e9todos expostos no objeto global <code>caches<\/code>:<\/p>\n\n\n\n<figure class=\"wp-block-table has-medium-font-size\"><table class=\"has-fixed-layout\"><thead><tr><td><strong>M\u00e9todo<\/strong><\/td><td><strong>Prop\u00f3sito<\/strong><\/td><\/tr><\/thead><tbody><tr><td><code>caches.open(cacheName)<\/code><\/td><td>Abre (ou cria) um cache com um nome espec\u00edfico (ex: <code>'v1-assets'<\/code>).<\/td><\/tr><tr><td><code>cache.addAll(urls)<\/code><\/td><td>Faz o <em>download<\/em> de uma lista de URLs e armazena as respostas no cache aberto.<\/td><\/tr><tr><td><code>cache.match(request)<\/code><\/td><td>Procura uma <code>Request<\/code> espec\u00edfica dentro do cache.<\/td><\/tr><tr><td><code>cache.delete(request)<\/code><\/td><td>Remove um recurso espec\u00edfico do cache.<\/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<h2 class=\"wp-block-heading has-large-font-size\">2. \ud83d\udc77 Implementando o Pr\u00e9-caching no Service Worker<\/h2>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\">O pr\u00e9-caching \u00e9 a t\u00e9cnica que garante que os recursos b\u00e1sicos (o &#8220;esqueleto&#8221; do aplicativo) estejam dispon\u00edveis desde o primeiro uso <em>offline<\/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>\/\/ service-worker.js\n\nconst CACHE_STATIC_NAME = 'static-v1'; \nconst OFFLINE_URLS = &#91;\n  '\/',\n  '\/index.html',\n  '\/styles.css',\n  '\/script.js'\n];\n\nself.addEventListener('install', (event) =&gt; {\n  \/\/ event.waitUntil garante que o SW n\u00e3o ative at\u00e9 que o cache esteja preenchido\n  event.waitUntil(\n    caches.open(CACHE_STATIC_NAME)\n      .then((cache) =&gt; {\n        console.log('Cache preenchido com App Shell.');\n        \/\/ Faz o download e armazena todos os recursos da lista\n        return cache.addAll(OFFLINE_URLS); \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\">3. \ud83d\udd04 Atualizando e Removendo o Cache<\/h2>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\">O cache n\u00e3o deve ser est\u00e1tico. A maneira mais segura de garantir que os usu\u00e1rios obtenham a vers\u00e3o mais recente dos recursos \u00e9 por meio do <strong>Controle de Vers\u00e3o do Cache<\/strong>.<\/p>\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. Atualiza\u00e7\u00e3o do Cache (Evento <code>activate<\/code>)<\/h3>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\">A melhor pr\u00e1tica para atualiza\u00e7\u00e3o \u00e9 criar um <strong>novo cache<\/strong> com um novo nome (<code>v2<\/code>, <code>v3<\/code>, etc.) no evento <code>install<\/code>, e usar o evento <code>activate<\/code> para deletar os caches antigos.<\/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>\/\/ service-worker.js\n\nconst CACHE_STATIC_NAME = 'static-v2'; \/\/ NOME FOI ALTERADO para for\u00e7ar atualiza\u00e7\u00e3o\n\nself.addEventListener('activate', (event) =&gt; {\n  event.waitUntil(\n    caches.keys().then(cacheNames =&gt; {\n      return Promise.all(\n        cacheNames.map(cacheName =&gt; {\n          \/\/ Se o nome do cache N\u00c3O for o nome atual (v2), ele \u00e9 antigo e deve ser deletado\n          if (cacheName !== CACHE_STATIC_NAME) {\n            console.log('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<h3 class=\"wp-block-heading\">B. Remo\u00e7\u00e3o de Recursos Espec\u00edficos<\/h3>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\">Se voc\u00ea precisar remover um \u00fanico recurso (ex: ap\u00f3s a refatora\u00e7\u00e3o), use o m\u00e9todo <code>cache.delete(request)<\/code> no momento apropriado (geralmente durante o <code>activate<\/code> ou o <code>fetch<\/code> para limpeza).<\/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\">4. \ud83d\udee0\ufe0f Depura\u00e7\u00e3o e Inspe\u00e7\u00e3o do Cache<\/h2>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\">A depura\u00e7\u00e3o \u00e9 feita diretamente nas ferramentas do navegador:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li class=\"has-medium-font-size\"><strong>Chrome\/Edge DevTools:<\/strong> V\u00e1 para a aba <strong>Application<\/strong> (Aplicativo). Na se\u00e7\u00e3o <em>Storage<\/em> (Armazenamento), voc\u00ea encontrar\u00e1 <strong>Cache Storage<\/strong> e <strong>Service Workers<\/strong>.\n<ul class=\"wp-block-list\">\n<li>Voc\u00ea pode inspecionar o conte\u00fado de cada cache e simular o funcionamento <strong>offline<\/strong>.<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li class=\"has-medium-font-size\"><strong>Lighthouse:<\/strong> A ferramenta de auditoria autom\u00e1tica do Google verifica se o PWA est\u00e1 <strong>registrando<\/strong> e <strong>ativando<\/strong> um Service Worker e se ele est\u00e1 gerenciando os eventos <code>start_url<\/code> para o modo <em>offline<\/em>.<\/li>\n<\/ul>\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\">O cache \u00e9 o motor que impulsiona a <strong>confiabilidade e a velocidade<\/strong> de um PWA. Ao utilizar o Service Worker para gerenciar a <strong>Cache API<\/strong>, voc\u00ea pode definir exatamente quais recursos s\u00e3o pr\u00e9-armazenados (<code>install<\/code> para o App Shell) e como o controle de vers\u00e3o (<code>activate<\/code> para limpeza) garante que o usu\u00e1rio sempre tenha acesso \u00e0 vers\u00e3o mais recente e a uma experi\u00eancia <em>offline<\/em> robusta. Dominar as estrat\u00e9gias de cache \u00e9 o passo final para entregar a experi\u00eancia de aplicativo nativo que os PWAs prometem.<\/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>Cache PWA: O armazenamento em cache \u00e9 o que transforma um website comum em 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-1535","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>Cache PWA - BLOG THIAGO ROSSI<\/title>\n<meta name=\"description\" content=\"Cache PWA: Uma das caracter\u00edsticas mais marcantes das PWAs \u00e9 a capacidade de funcionar offline, gra\u00e7as ao armazenamento em cache...\" \/>\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\/cache-pwa\/\" \/>\n<meta property=\"og:locale\" content=\"pt_BR\" \/>\n<meta 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