{"id":2135,"date":"2021-12-01T08:00:00","date_gmt":"2021-12-01T11:00:00","guid":{"rendered":"https:\/\/coodesh.com\/blog\/?p=2135"},"modified":"2024-01-05T07:44:29","modified_gmt":"2024-01-05T10:44:29","slug":"o-que-e-cors","status":"publish","type":"post","link":"https:\/\/coodesh.com\/blog\/dicionario\/o-que-e-cors\/","title":{"rendered":"O que \u00e9 CORS?"},"content":{"rendered":"\n<p>Todo desenvolvedor Front-end j\u00e1 se deparou com o CORS no desenvolvimento web. Mas, afinal, <strong>o que \u00e9 CORS<\/strong>? Em resumo, \u00e9 o compartilhamento de recursos com origens diferentes. Ele \u00e9 essencial para garantir a navega\u00e7\u00e3o segura ao usu\u00e1rio, evitar a a\u00e7\u00e3o de <a href=\"https:\/\/seguranca.uol.com.br\/antivirus\/dicas\/curiosidades\/hackers_crackers_qual_a_diferenca_entre_eles.html#rmcl\" target=\"_blank\" rel=\"noreferrer noopener\">crackers <\/a>e o acesso de websites maliciosos.&nbsp;<\/p>\n\n\n\n<p>CORS \u00e9 o acr\u00f4nimo de <strong>Cross-origin Resource Sharing (<\/strong>Compartilhamento de Recursos de Origem Cruzada). Na pr\u00e1tica, ele informa aos navegadores se um determinado recurso pode ou n\u00e3o ser acessado.&nbsp;<\/p>\n\n\n\n<p>Basicamente, todo navegador possui um mecanismo de seguran\u00e7a chamado de same-origin policy. Portanto, ele \u00e9 usado para garantir mais seguran\u00e7a e limitar como um documento ou script de uma determinada origem pode interagir com recursos de outra origem diferente.&nbsp;<\/p>\n\n\n\n<p>Sendo assim, para entender melhor o que \u00e9 CORS, \u00e9 necess\u00e1rio compreender o que \u00e9 origem. Vamos l\u00e1?&nbsp;<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">O que \u00e9 origem?&nbsp;<\/h2>\n\n\n\n<p>A origem de um website \u00e9 uma composi\u00e7\u00e3o envolvendo:&nbsp;<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>Protocolo;<\/li><li>Host;<\/li><li>Porta.&nbsp;<\/li><\/ul>\n\n\n\n<p>Desse modo, no exemplo <a href=\"http:\/\/meuhost.com:80\" target=\"_blank\" rel=\"noreferrer noopener\">http:\/\/meuhost.com:80<\/a> podemos identificar que \u201chttp\u201d \u00e9 o protocolo, \u201cmeuhost.com\u201d \u00e9 o host propriamente dito, e \u201c80\u201d \u00e9 a porta utilizada.&nbsp;<\/p>\n\n\n\n<p>Enfim, se voc\u00ea usar outros endere\u00e7os, com diferen\u00e7as no protocolo, no host ou na porta, o recurso CORS aparecer\u00e1 e ser\u00e1 preciso resolv\u00ea-lo para dar continuidade ao projeto.&nbsp;<\/p>\n\n\n\n<p>Portanto, se voc\u00ea usar, por exemplo, o protocolo \u201chttps\u201d, ser\u00e1 necess\u00e1rio resolver o CORS, bem como se voc\u00ea estiver acessando uma <a href=\"https:\/\/coodesh.com\/blog\/dicionario\/o-que-e-api\/\" target=\"_blank\" rel=\"noreferrer noopener\">API<\/a> ou um subdom\u00ednio. Refor\u00e7ando, ser\u00e1 necess\u00e1rio fazer a configura\u00e7\u00e3o do CORS.&nbsp;<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">O que \u00e9 same-origin policy?&nbsp;<\/h2>\n\n\n\n<p>A internet n\u00e3o \u00e9 uma terra sem lei, n\u00e3o \u00e9 verdade? Por isso, por padr\u00e3o, o <a href=\"https:\/\/coodesh.com\/blog\/candidates\/carreiras\/desenvolvedor-front-end-react\/\" target=\"_blank\" rel=\"noreferrer noopener\">desenvolvedor Front-end <\/a>s\u00f3 consegue acessar tranquilamente recursos localizados na mesma origem de uma solicita\u00e7\u00e3o.&nbsp;<\/p>\n\n\n\n<p>Isso se deve ao same-origin policy, que \u00e9 um mecanismo de seguran\u00e7a presente nos navegadores.&nbsp;&nbsp;<\/p>\n\n\n\n<p>Desse modo, quando surge um erro de CORS, o desenvolvedor deve verificar qual requisi\u00e7\u00e3o est\u00e1 causando o problema no console do seu navegador. Na maioria das vezes, o problema \u00e9 causado por n\u00e3o haver headers ao lado do seu servidor.&nbsp;<\/p>\n\n\n\n<p>Portanto, antes de exibir os dados necess\u00e1rios, o navegador solicita ao servidor a busca por esses dados. Desse modo, <strong>o cliente envia uma requisi\u00e7\u00e3o no protocolo HTTP com os dados necess\u00e1rios.&nbsp;<\/strong><\/p>\n\n\n\n<p>Mas como se trata de um recurso com cross-origin (ou origem cruzada), com um protocolo, host ou porta diferente, \u00e9 preciso fazer a valida\u00e7\u00e3o pelo CORS.&nbsp;<\/p>\n\n\n\n<p>Em s\u00edntese, a pol\u00edtica do same-origin vem para evitar a a\u00e7\u00e3o de sites maliciosos quando voc\u00ea clica acidentalmente em um link de rede social, por exemplo.&nbsp;<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Conclus\u00e3o&nbsp;<\/h2>\n\n\n\n<p>Voc\u00ea viu o que \u00e9 CORS e como ele pode conferir mais seguran\u00e7a \u00e0 navega\u00e7\u00e3o ao usu\u00e1rio. Portanto, o desenvolvedor Front-end precisa conhecer esse recurso e as formas de resolv\u00ea-lo para dar continuidade aos projetos quando se est\u00e1 compartilhando dados de origens cruzadas.&nbsp;<\/p>\n\n\n\n<p>Que tal agora conferir outros conte\u00fados como esse no <a href=\"https:\/\/coodesh.com\/blog\/dicionario\/\" target=\"_blank\" rel=\"noreferrer noopener\">Dicion\u00e1rio Tech<\/a> da Coodesh? Ali\u00e1s, a <a href=\"https:\/\/coodesh.com\/\" target=\"_blank\" rel=\"noreferrer noopener\">Coodesh <\/a>\u00e9 uma startup de valida\u00e7\u00e3o de desenvolvedores e recrutamento tech para empresas em expans\u00e3o.&nbsp;<\/p>\n\n\n\n<p>Conhe\u00e7a melhor nossas solu\u00e7\u00f5es para desenvolvedores, como cadastro gratuito na plataforma, testes t\u00e9cnicos e comportamentais, bem como mentorias de carreira.&nbsp;<\/p>\n\n\n\n<p><a href=\"https:\/\/coodesh.com\/desenvolvedores\" target=\"_blank\" rel=\"noreferrer noopener\">Acesse este link<\/a> e saiba mais.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Todo desenvolvedor Front-end j\u00e1 se deparou com o CORS no desenvolvimento web. Mas, afinal, o que \u00e9 CORS? Em resumo, \u00e9 o compartilhamento de recursos com origens diferentes. Ele \u00e9 essencial para garantir a navega\u00e7\u00e3o segura ao usu\u00e1rio, evitar a a\u00e7\u00e3o de crackers e o acesso de websites maliciosos.&nbsp; CORS \u00e9 o acr\u00f4nimo de Cross-origin [&hellip;] <a class=\"g1-link g1-link-more\" href=\"https:\/\/coodesh.com\/blog\/dicionario\/o-que-e-cors\/\">Ler mais<\/a><\/p>\n","protected":false},"author":1,"featured_media":2136,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[191],"tags":[498,91,481,90,486,499,500,398],"class_list":{"0":"post-2135","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-dicionario","8":"tag-api","9":"tag-back-end","10":"tag-desenvolvimento-web","11":"tag-front-end","12":"tag-navegador","13":"tag-origem","14":"tag-protocolo","15":"tag-seguranca"},"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - 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