{"id":18480,"date":"2025-04-18T08:30:15","date_gmt":"2025-04-18T05:30:15","guid":{"rendered":"https:\/\/fatihsoysal.com\/blog\/reactte-cors-hatasini-duzeltme-rehberi\/"},"modified":"2025-04-18T08:30:15","modified_gmt":"2025-04-18T05:30:15","slug":"reactte-cors-hatasini-duzeltme-rehberi","status":"publish","type":"post","link":"https:\/\/fatihsoysal.com\/blog\/reactte-cors-hatasini-duzeltme-rehberi\/","title":{"rendered":"React&#8217;te CORS Hatas\u0131n\u0131 D\u00fczeltme Rehberi"},"content":{"rendered":"<p><body><\/p>\n<p>React&#8217;te CORS Hatas\u0131n\u0131 D\u00fczeltme Rehberi<\/p>\n<p>React geli\u015ftiricileri olarak,  API \u00e7a\u011fr\u0131lar\u0131 yaparken s\u0131kl\u0131kla kar\u015f\u0131la\u015ft\u0131\u011f\u0131m\u0131z bir hata t\u00fcr\u00fc olan CORS (Cross-Origin Resource Sharing) hatas\u0131yla m\u00fccadele etmek durumunda kal\u0131r\u0131z.  Bu hata, farkl\u0131 domainler aras\u0131nda kaynak payla\u015f\u0131m\u0131na izin verilmedi\u011finde ortaya \u00e7\u0131kar.  \u00d6rne\u011fin,  <code>https:\/\/fatihsoysal.com<\/code> adresindeki React uygulaman\u0131z  <code>https:\/\/api.example.com<\/code> adresinden veri \u00e7ekmeye \u00e7al\u0131\u015ft\u0131\u011f\u0131nda bu hatayla kar\u015f\u0131la\u015fabilirsiniz. Bu yaz\u0131da, bu sorunu \u00e7\u00f6zmek i\u00e7in uygulayabilece\u011finiz farkl\u0131 y\u00f6ntemleri detayl\u0131 bir \u015fekilde inceleyece\u011fiz.<\/p>\n<h2>CORS Hatas\u0131n\u0131n Nedenleri<\/h2>\n<p>\u00d6ncelikle,  CORS hatas\u0131n\u0131n nedenlerini anlamak \u00f6nemlidir.  Taray\u0131c\u0131 g\u00fcvenli\u011fi nedeniyle,  bir web uygulamas\u0131 farkl\u0131 bir domain&#8217;den kaynaklara eri\u015fmeye \u00e7al\u0131\u015ft\u0131\u011f\u0131nda,  otomatik olarak bir g\u00fcvenlik k\u0131s\u0131tlamas\u0131 devreye girer.  Bu k\u0131s\u0131tlama,  istemsiz sald\u0131r\u0131lardan korunmak amac\u0131yla konulmu\u015ftur.  Ancak,  legitim API \u00e7a\u011fr\u0131lar\u0131 da bu k\u0131s\u0131tlama nedeniyle engellenebilir.<\/p>\n<h2>CORS Hatas\u0131n\u0131n \u00c7\u00f6z\u00fcm Yollar\u0131<\/h2>\n<p>Neyse ki,  CORS hatas\u0131n\u0131 \u00e7\u00f6zmenin birka\u00e7 yolu vard\u0131r.  En yayg\u0131n \u00e7\u00f6z\u00fcm,  backend taraf\u0131nda gerekli ba\u015fl\u0131klar\u0131 ayarlamak olup; di\u011ferleri ise proxy kullan\u0131m\u0131 veya farkl\u0131 k\u00fct\u00fcphaneler ile \u00e7al\u0131\u015fmay\u0131 i\u00e7erir.  A\u015fa\u011f\u0131da,  bu y\u00f6ntemleri ad\u0131m ad\u0131m inceleyelim:<\/p>\n<h3>1. Backend Taraf\u0131nda Ba\u015fl\u0131k Ayarlama<\/h3>\n<p>En etkili \u00e7\u00f6z\u00fcm,  backend geli\u015ftiricinizle ileti\u015fime ge\u00e7erek,  API&#8217;nizin <code>Access-Control-Allow-Origin<\/code> ba\u015fl\u0131\u011f\u0131n\u0131 do\u011fru \u015fekilde yap\u0131land\u0131rmas\u0131n\u0131 sa\u011flamakt\u0131r.  Bu ba\u015fl\u0131k,  hangi domainlerin  API&#8217;nize eri\u015febilece\u011fini tan\u0131mlar.  \u00d6rne\u011fin,  React uygulaman\u0131z\u0131n domain&#8217;i <code>https:\/\/fatihsoysal.com<\/code> ise,  backend&#8217;inizde \u015fu \u015fekilde bir ayar yap\u0131lmas\u0131 gerekir:<\/p>\n<pre><code class=\"language-javascript\">\nAccess-Control-Allow-Origin: https:\/\/fatihsoysal.com\n<\/code><\/pre>\n<p>E\u011fer API&#8217;nizin t\u00fcm domainlerden eri\u015filebilir olmas\u0131n\u0131 istiyorsan\u0131z,  <code>*<\/code> kullanabilirsiniz; ancak bu,  g\u00fcvenlik a\u00e7\u0131s\u0131ndan riskli olabilir. Daha g\u00fcvenli bir yakla\u015f\u0131m,  belirli domainleri listelemektir.<\/p>\n<h3>2. Proxy Kullan\u0131m\u0131<\/h3>\n<p>Backend&#8217;e eri\u015fiminiz yoksa veya  <code>Access-Control-Allow-Origin<\/code> ba\u015fl\u0131\u011f\u0131n\u0131 ayarlama imkan\u0131n\u0131z yoksa,  proxy kullanarak bu sorunu a\u015fabilirsiniz.  Proxy,  React uygulaman\u0131z ile API aras\u0131nda bir arac\u0131 g\u00f6revi g\u00f6r\u00fcr.  Uygulaman\u0131z proxy&#8217;e istek g\u00f6nderir,  proxy ise API&#8217;ye istek g\u00f6nderir ve cevab\u0131 size iletir.  Bu sayede,  CORS hatas\u0131ndan ka\u00e7\u0131n\u0131lm\u0131\u015f olur.  Bu y\u00f6ntem i\u00e7in,  <code>create-react-app<\/code> ile olu\u015fturulmu\u015f projelerde proxy \u00f6zelli\u011fini kullanabilirsiniz.<\/p>\n<h3>3.  fetch veya axios K\u00fct\u00fcphanelerini Kullanma<\/h3>\n<p><code>fetch<\/code> API&#8217;s\u0131 veya  <code>axios<\/code> gibi k\u00fct\u00fcphaneler kullanarak da API \u00e7a\u011fr\u0131lar\u0131n\u0131 ger\u00e7ekle\u015ftirebilirsiniz.  Bu k\u00fct\u00fcphaneler,  CORS hatas\u0131n\u0131n \u00fcstesinden gelmenize yard\u0131mc\u0131 olabilecek baz\u0131 \u00f6zellikler sunar. Ancak,  bu k\u00fct\u00fcphaneler,  CORS hatas\u0131n\u0131n temel nedenini \u00e7\u00f6zmez.  Backend&#8217;deki do\u011fru yap\u0131land\u0131rman\u0131n en g\u00fcvenli ve tercih edilen \u00e7\u00f6z\u00fcm oldu\u011funu unutmay\u0131n.<\/p>\n<h2>Ek Bilgiler ve Kaynaklar<\/h2>\n<p>Daha detayl\u0131 bilgi i\u00e7in  <a href=\"https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/CORS\">MDN&#8217;nin CORS d\u00f6k\u00fcman\u0131na<\/a>  g\u00f6z atabilirsiniz. Ayr\u0131ca,  <a href=\"https:\/\/dev.to\/reynaldi\/how-to-fix-cors-error-in-react-4hb9\">bu \u0130ngilizce makale<\/a> de faydal\u0131 olacakt\u0131r.  Unutmay\u0131n ki, CORS hatas\u0131n\u0131n \u00e7\u00f6z\u00fcm\u00fc genellikle backend taraf\u0131nda yap\u0131lan d\u00fczenlemelerle ger\u00e7ekle\u015fir.  Bu nedenle,  backend geli\u015ftiricinizle i\u015fbirli\u011fi yapmak \u00f6nemlidir.<\/p>\n<p>Umar\u0131m bu rehber,  React uygulamalar\u0131n\u0131zdaki CORS hatas\u0131n\u0131 \u00e7\u00f6zmenize yard\u0131mc\u0131 olmu\u015ftur.  Ba\u015fka sorular\u0131n\u0131z varsa,  <a href=\"https:\/\/fatihsoysal.com\">web sitemi<\/a> \u00fczerinden bana ula\u015fabilirsiniz.<\/p>\n<p><\/body><br \/>\n<\/html><\/p>\n<p>#Etiketler: CORS hatas\u0131, React, CORS \u00e7\u00f6z\u00fcm\u00fc, frontend, backend, API, JavaScript, fetch, axios, Access-Control-Allow-Origin, proxy<\/p>\n","protected":false},"excerpt":{"rendered":"React&#8217;te CORS Hatas\u0131n\u0131 D\u00fczeltme Rehberi React geli\u015ftiricileri olarak, API \u00e7a\u011fr\u0131lar\u0131 yaparken s\u0131kl\u0131kla kar\u015f\u0131la\u015ft\u0131\u011f\u0131m\u0131z bir hata t\u00fcr\u00fc olan CORS&hellip;","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"csco_page_header_type":"","csco_page_load_nextpost":"","csco_page_subscribe_form":"","csco_page_contact_form":"","footnotes":""},"categories":[1],"tags":[],"class_list":{"0":"post-18480","1":"post","2":"type-post","3":"status-publish","4":"format-standard","6":"category-genel","7":"cs-entry","8":"cs-video-wrap"},"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v20.5 (Yoast SEO v25.3.1) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>React&#039;te CORS Hatas\u0131n\u0131 D\u00fczeltme Rehberi<\/title>\n<meta name=\"description\" content=\"React geli\u015ftiricileri olarak, API \u00e7a\u011fr\u0131lar\u0131 yaparken s\u0131kl\u0131kla kar\u015f\u0131la\u015ft\u0131\u011f\u0131m\u0131z bir hata t\u00fcr\u00fc olan CORS (Cross-Origin Resource Sharing) hatas\u0131yla m\u00fccadele etmek durumunda kal\u0131r\u0131z. Bu hata, farkl\u0131 domainler aras\u0131nda kaynak payla\u015f\u0131m\u0131na izin verilmedi\u011finde ortaya \u00e7\u0131kar. \u00d6rne\u011fin, https:\/\/fatihsoysal.com adresindeki React uygulaman\u0131z https:\/\/api.example.com adresinden veri \u00e7ekmeye \u00e7al\u0131\u015ft\u0131\u011f\u0131nda bu hatayla kar\u015f\u0131la\u015fabilirsiniz. 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