{"id":39344,"date":"2026-02-19T11:41:38","date_gmt":"2026-02-19T08:41:38","guid":{"rendered":"https:\/\/fatihsoysal.com\/blog\/?p=39344"},"modified":"2026-02-19T11:41:38","modified_gmt":"2026-02-19T08:41:38","slug":"giris-web-servislerinin-onemi-ve-mulakatlarda-yeri","status":"publish","type":"post","link":"https:\/\/fatihsoysal.com\/blog\/giris-web-servislerinin-onemi-ve-mulakatlarda-yeri\/","title":{"rendered":"Giri\u015f: Web Servislerinin \u00d6nemi ve M\u00fclakatlarda Yeri"},"content":{"rendered":"<p><body><\/p>\n<h2>Giri\u015f: Web Servislerinin \u00d6nemi ve M\u00fclakatlarda Yeri<\/h2>\n<p>G\u00fcn\u00fcm\u00fcz yaz\u0131l\u0131m d\u00fcnyas\u0131nda, uygulamalar\u0131n birbirleriyle sorunsuz bir \u015fekilde ileti\u015fim kurabilmesi hayati \u00f6nem ta\u015f\u0131maktad\u0131r. Bu ileti\u015fimi sa\u011flayan temel mekanizmalardan biri de web servisleridir. Da\u011f\u0131t\u0131k sistemler, mikro servis mimarileri, mobil uygulamalar ve kurumsal entegrasyonlar gibi bir\u00e7ok alanda web servisleri vazge\u00e7ilmez bir role sahiptir. Bu nedenle, yaz\u0131l\u0131m geli\u015ftirici m\u00fclakatlar\u0131nda web servisleri, \u00f6zellikle de SOAP ve RESTful mimarileri hakk\u0131nda bilgi sahibi olmak, adaylar\u0131n teknik yetkinli\u011fini g\u00f6steren kritik bir fakt\u00f6rd\u00fcr.<\/p>\n<p>Bu rehberde, SOAP ve RESTful web servislerinin temel prensiplerini, avantajlar\u0131n\u0131, dezavantajlar\u0131n\u0131 ve m\u00fclakatlarda s\u0131k\u00e7a sorulan sorular\u0131 ele alaca\u011f\u0131z. Amac\u0131m\u0131z, hem teorik bilgiyi peki\u015ftirmek hem de pratik m\u00fclakat senaryolar\u0131na haz\u0131rl\u0131k yapman\u0131z\u0131 sa\u011flamakt\u0131r.<\/p>\n<h2>Web Servis Temelleri ve \u0130leti\u015fim Protokolleri<\/h2>\n<p>Web servisleri, farkl\u0131 platformlarda ve farkl\u0131 programlama dillerinde yaz\u0131lm\u0131\u015f uygulamalar\u0131n a\u011f \u00fczerinden birbirleriyle ileti\u015fim kurmas\u0131n\u0131 sa\u011flayan standartla\u015ft\u0131r\u0131lm\u0131\u015f y\u00f6ntemlerdir. Bu servisler, genellikle bir istemcinin (client) bir sunucuya (server) istek g\u00f6ndermesi ve sunucunun bu iste\u011fi i\u015fleyerek bir yan\u0131t d\u00f6nd\u00fcrmesi prensibiyle \u00e7al\u0131\u015f\u0131r.<\/p>\n<h3>Veri Formatlar\u0131 ve \u0130leti\u015fim<\/h3>\n<p>Web servisleri, veri al\u0131\u015fveri\u015fi i\u00e7in \u00e7e\u015fitli formatlar kullanabilir. En yayg\u0131n olanlar\u0131:<\/p>\n<ul>\n<li><strong>XML (Extensible Markup Language):<\/strong> \u00d6zellikle eski ve kurumsal sistemlerde yayg\u0131n olarak kullan\u0131l\u0131r. Yap\u0131land\u0131r\u0131lm\u0131\u015f veriyi hiyerar\u015fik bir \u015fekilde temsil eder.<\/li>\n<li><strong>JSON (JavaScript Object Notation):<\/strong> Hafif, okunmas\u0131 kolay ve web uygulamalar\u0131nda (\u00f6zellikle RESTful servislerde) en \u00e7ok tercih edilen veri format\u0131d\u0131r.<\/li>\n<\/ul>\n<p>\u0130leti\u015fim genellikle HTTP (Hypertext Transfer Protocol) \u00fczerinden ger\u00e7ekle\u015fir, ancak SOAP gibi baz\u0131 servisler SMTP, JMS gibi farkl\u0131 ta\u015f\u0131ma protokollerini de kullanabilir.<\/p>\n<h2>SOAP (Simple Object Access Protocol) Detaylar\u0131 ve M\u00fclakat Sorular\u0131<\/h2>\n<p>SOAP, da\u011f\u0131t\u0131k ortamlarda bilgi al\u0131\u015fveri\u015fi i\u00e7in tasarlanm\u0131\u015f XML tabanl\u0131 bir mesajla\u015fma protokol\u00fcd\u00fcr. Genellikle kurumsal d\u00fczeydeki uygulamalar ve karma\u015f\u0131k entegrasyonlar i\u00e7in tercih edilir.<\/p>\n<h3>SOAP&#8217;un Temel \u00d6zellikleri ve Bile\u015fenleri<\/h3>\n<ul>\n<li><strong>XML Tabanl\u0131:<\/strong> T\u00fcm SOAP mesajlar\u0131 XML format\u0131ndad\u0131r. Bu, mesajlar\u0131n daha verbose (ayr\u0131nt\u0131l\u0131) olmas\u0131na neden olur.<\/li>\n<li><strong>Protokol Ba\u011f\u0131ms\u0131zl\u0131\u011f\u0131:<\/strong> HTTP&#8217;nin yan\u0131 s\u0131ra SMTP, FTP, JMS gibi farkl\u0131 ta\u015f\u0131ma protokolleri \u00fczerinden de \u00e7al\u0131\u015fabilir.<\/li>\n<li><strong>WSDL (Web Services Description Language):<\/strong> Bir SOAP servisinin nas\u0131l kullan\u0131laca\u011f\u0131n\u0131 (hangi metotlar\u0131 sundu\u011fu, hangi parametreleri ald\u0131\u011f\u0131, hangi d\u00f6n\u00fc\u015f tiplerini kulland\u0131\u011f\u0131 vb.) a\u00e7\u0131klayan XML tabanl\u0131 bir dildir. Bir servis i\u00e7in bir &#8220;s\u00f6zle\u015fme&#8221; g\u00f6revi g\u00f6r\u00fcr.<\/li>\n<li><strong>ACID Uyumlulu\u011fu:<\/strong> Da\u011f\u0131t\u0131k i\u015flemler ve g\u00fcvenli mesajla\u015fma i\u00e7in g\u00fc\u00e7l\u00fc destek sunar.<\/li>\n<li><strong>WS-Security:<\/strong> Mesaj d\u00fczeyinde g\u00fcvenlik (\u015fifreleme, imzalama, kimlik do\u011frulama) sa\u011flamak i\u00e7in bir dizi standart sunar.<\/li>\n<\/ul>\n<h3>SOAP Mesaj Yap\u0131s\u0131<\/h3>\n<p>Bir SOAP mesaj\u0131 temelde \u00fc\u00e7 ana b\u00f6l\u00fcmden olu\u015fur:<\/p>\n<ol>\n<li><strong>Envelope (Zarf):<\/strong> Mesaj\u0131n k\u00f6k elementi olup, mesaj\u0131n bir SOAP mesaj\u0131 oldu\u011funu belirtir.<\/li>\n<li><strong>Header (Ba\u015fl\u0131k):<\/strong> \u0130ste\u011fe ba\u011fl\u0131d\u0131r. Kimlik do\u011frulama, i\u015flem bilgileri gibi uygulama veya protokol ile ilgili meta verileri ta\u015f\u0131r.<\/li>\n<li><strong>Body (G\u00f6vde):<\/strong> Mesaj\u0131n ana i\u00e7eri\u011fini, yani \u00e7a\u011fr\u0131lacak metot parametrelerini veya metodun d\u00f6n\u00fc\u015f de\u011ferini i\u00e7erir.<\/li>\n<li><strong>Fault (Hata):<\/strong> Hata durumunda, hata kodunu, mesaj\u0131n\u0131 ve detaylar\u0131n\u0131 i\u00e7eren iste\u011fe ba\u011fl\u0131 bir b\u00f6l\u00fcmd\u00fcr.<\/li>\n<\/ol>\n<p><strong>\u00d6rnek SOAP \u0130ste\u011fi (XML):<\/strong><\/p>\n<pre><code>\n<soapenv:Envelope xmlns:soapenv=\"http:\/\/schemas.xmlsoap.org\/soap\/envelope\/\"\n                  xmlns:web=\"http:\/\/www.example.com\/webservice\">\n   <soapenv:Header\/>\n   <soapenv:Body>\n      <web:GetProductDetails>\n         <web:productId>12345<\/web:productId>\n      <\/web:GetProductDetails>\n   <\/soapenv:Body>\n<\/soapenv:Envelope>\n<\/code><\/pre>\n<h3>SOAP&#8217;un Avantajlar\u0131 ve Dezavantajlar\u0131<\/h3>\n<ul>\n<li><strong>Avantajlar\u0131:<\/strong>\n<ul>\n<li>ACID uyumlulu\u011fu ve g\u00fc\u00e7l\u00fc i\u015flem deste\u011fi.<\/li>\n<li>WS-Security gibi yerle\u015fik g\u00fcvenlik standartlar\u0131.<\/li>\n<li>WSDL sayesinde s\u0131k\u0131 s\u00f6zle\u015fme ve otomatik kod \u00fcretimi.<\/li>\n<li>Protokol ba\u011f\u0131ms\u0131zl\u0131\u011f\u0131.<\/li>\n<li>Kurumsal d\u00fczeyde \u00e7\u00f6z\u00fcmler i\u00e7in uygun.<\/li>\n<\/ul>\n<\/li>\n<li><strong>Dezavantajlar\u0131:<\/strong>\n<ul>\n<li>XML tabanl\u0131 oldu\u011fu i\u00e7in daha karma\u015f\u0131k ve verbose mesajlar.<\/li>\n<li>Daha fazla a\u011f trafi\u011fi ve i\u015fleme y\u00fck\u00fc.<\/li>\n<li>Geli\u015ftirme s\u00fcreci REST&#8217;e g\u00f6re daha yava\u015f ve karma\u015f\u0131k olabilir.<\/li>\n<li>Daha az esnek.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h3>M\u00fclakat Sorular\u0131: SOAP<\/h3>\n<ol>\n<li><strong>SOAP nedir ve ne ama\u00e7la kullan\u0131l\u0131r?<\/strong>\n<p><em>Yan\u0131t:<\/em> SOAP, da\u011f\u0131t\u0131k ortamlarda bilgi al\u0131\u015fveri\u015fi i\u00e7in tasarlanm\u0131\u015f XML tabanl\u0131 bir mesajla\u015fma protokol\u00fcd\u00fcr. Genellikle kurumsal entegrasyonlar, finansal i\u015flemler gibi y\u00fcksek g\u00fcvenlik, g\u00fcvenilirlik ve i\u015flem b\u00fct\u00fcnl\u00fc\u011f\u00fc gerektiren senaryolarda kullan\u0131l\u0131r.<\/p>\n<\/li>\n<li><strong>WSDL nedir ve neden \u00f6nemlidir?<\/strong>\n<p><em>Yan\u0131t:<\/em> WSDL (Web Services Description Language), bir SOAP web servisinin nas\u0131l \u00e7a\u011fr\u0131laca\u011f\u0131n\u0131 (hangi metotlar\u0131 sundu\u011funu, parametrelerini, d\u00f6n\u00fc\u015f tiplerini vb.) a\u00e7\u0131klayan XML tabanl\u0131 bir dildir. Servis ile istemci aras\u0131nda bir &#8220;s\u00f6zle\u015fme&#8221; g\u00f6revi g\u00f6r\u00fcr ve istemcilerin servisi otomatik olarak ke\u015ffetmesini ve entegre etmesini sa\u011flar.<\/p>\n<\/li>\n<li><strong>SOAP mesaj yap\u0131s\u0131n\u0131 a\u00e7\u0131klay\u0131n.<\/strong>\n<p><em>Yan\u0131t:<\/em> Bir SOAP mesaj\u0131 bir Envelope (zarf) ile ba\u015flar. Envelope i\u00e7inde iste\u011fe ba\u011fl\u0131 Header (ba\u015fl\u0131k) ve zorunlu Body (g\u00f6vde) bulunur. Header, meta verileri (g\u00fcvenlik bilgileri gibi) ta\u015f\u0131rken, Body as\u0131l mesaj i\u00e7eri\u011fini (metot \u00e7a\u011fr\u0131s\u0131 veya yan\u0131t\u0131) i\u00e7erir. Hata durumlar\u0131 i\u00e7in iste\u011fe ba\u011fl\u0131 Fault (hata) b\u00f6l\u00fcm\u00fc de olabilir.<\/p>\n<\/li>\n<li><strong>SOAP kullanman\u0131n avantajlar\u0131 ve dezavantajlar\u0131 nelerdir?<\/strong>\n<p><em>Yan\u0131t:<\/em> Avantajlar\u0131 aras\u0131nda g\u00fc\u00e7l\u00fc g\u00fcvenlik (WS-Security), i\u015flem b\u00fct\u00fcnl\u00fc\u011f\u00fc (ACID), resmi bir s\u00f6zle\u015fme (WSDL) ve protokol ba\u011f\u0131ms\u0131zl\u0131\u011f\u0131 say\u0131labilir. Dezavantajlar\u0131 ise XML&#8217;den dolay\u0131 karma\u015f\u0131kl\u0131k ve verbosity, daha fazla a\u011f y\u00fck\u00fc ve geli\u015ftirme zorlu\u011fudur.<\/p>\n<\/li>\n<\/ol>\n<h2>RESTful (Representational State Transfer) Web Servisleri ve M\u00fclakat Sorular\u0131<\/h2>\n<p>REST, World Wide Web&#8217;in temel mimari prensiplerini kullanan bir yaz\u0131l\u0131m mimarisi stilidir. SOAP&#8217;un aksine bir protokol de\u011fil, belirli k\u0131s\u0131tlamalar ve prensipler b\u00fct\u00fcn\u00fcd\u00fcr. Genellikle mobil uygulamalar, tek sayfa uygulamalar\u0131 (SPA) ve mikro servis mimarileri i\u00e7in tercih edilir.<\/p>\n<h3>REST&#8217;in Temel Mimari Prensipleri (K\u0131s\u0131tlamalar\u0131)<\/h3>\n<p>Bir API&#8217;nin &#8220;RESTful&#8221; olabilmesi i\u00e7in belirli prensiplere uymas\u0131 gerekir:<\/p>\n<ul>\n<li><strong>Client-Server (\u0130stemci-Sunucu):<\/strong> \u0130stemci ve sunucu birbirinden ba\u011f\u0131ms\u0131zd\u0131r. \u0130stemci kullan\u0131c\u0131 aray\u00fcz\u00fcn\u00fc ve sunucu veri depolamas\u0131n\u0131 ve i\u015f mant\u0131\u011f\u0131n\u0131 y\u00f6netir.<\/li>\n<li><strong>Stateless (Durumsuz):<\/strong> Her istek, sunucu taraf\u0131ndan i\u015flenmesi i\u00e7in gerekli t\u00fcm bilgiyi i\u00e7ermelidir. Sunucu, istemcinin \u00f6nceki isteklerinden herhangi bir ba\u011flam veya durum bilgisi saklamaz. Bu, \u00f6l\u00e7eklenebilirli\u011fi art\u0131r\u0131r.<\/li>\n<li><strong>Cacheable (\u00d6nbelleklenebilir):<\/strong> Yan\u0131tlar \u00f6nbelle\u011fe al\u0131nabilir olarak i\u015faretlenebilir, bu da performans\u0131 art\u0131r\u0131r ve sunucu y\u00fck\u00fcn\u00fc azalt\u0131r.<\/li>\n<li><strong>Layered System (Katmanl\u0131 Sistem):<\/strong> \u0130stemci, son sunucuya m\u0131 yoksa ara bir bile\u015fene (proxy, load balancer) m\u0131 ba\u011fl\u0131 oldu\u011funu bilmez. Bu, mimarinin esnekli\u011fini ve \u00f6l\u00e7eklenebilirli\u011fini art\u0131r\u0131r.<\/li>\n<li><strong>Uniform Interface (Tekd\u00fczen Aray\u00fcz):<\/strong> En \u00f6nemli prensiplerden biridir. D\u00f6rt alt k\u0131s\u0131tlamas\u0131 vard\u0131r:\n<ol>\n<li><strong>Resource Identification in Requests (Kaynaklar\u0131n \u0130steklerde Tan\u0131mlanmas\u0131):<\/strong> Kaynaklar URI (Uniform Resource Identifier) ile tan\u0131mlan\u0131r.<\/li>\n<li><strong>Resource Manipulation through Representations (Temsiller Arac\u0131l\u0131\u011f\u0131yla Kaynak Manip\u00fclasyonu):<\/strong> \u0130stemci, bir kayna\u011f\u0131n temsilini (JSON veya XML gibi) alarak onu manip\u00fcle edebilir.<\/li>\n<li><strong>Self-Descriptive Messages (Kendi Kendini A\u00e7\u0131klayan Mesajlar):<\/strong> Her mesaj, nas\u0131l i\u015flenece\u011fi hakk\u0131nda yeterli bilgiyi i\u00e7ermelidir (\u00f6rn: HTTP metotlar\u0131, durum kodlar\u0131, i\u00e7erik tipi).<\/li>\n<li><strong>HATEOAS (Hypermedia as the Engine of Application State):<\/strong> Bir kayna\u011f\u0131n temsilinde, ilgili di\u011fer kaynaklara ba\u011flant\u0131lar (hypermedia linkleri) bulunmal\u0131d\u0131r. Bu, istemcinin API&#8217;yi dinamik olarak ke\u015ffetmesini sa\u011flar.<\/li>\n<\/ol>\n<\/li>\n<\/ul>\n<h3>HTTP Metotlar\u0131 ve Durum Kodlar\u0131<\/h3>\n<p>RESTful servisler, kaynaklar \u00fczerinde CRUD (Create, Read, Update, Delete) operasyonlar\u0131 i\u00e7in standart HTTP metotlar\u0131n\u0131 kullan\u0131r:<\/p>\n<ul>\n<li><strong>GET:<\/strong> Bir kayna\u011f\u0131 veya kaynak koleksiyonunu okumak i\u00e7in kullan\u0131l\u0131r. \u0130dempotent&#8217;tir ve g\u00fcvenlidir (sunucu durumunu de\u011fi\u015ftirmez).<\/li>\n<li><strong>POST:<\/strong> Yeni bir kaynak olu\u015fturmak i\u00e7in kullan\u0131l\u0131r. Genellikle bir koleksiyona yeni bir \u00f6\u011fe ekler. \u0130dempotent de\u011fildir.<\/li>\n<li><strong>PUT:<\/strong> Mevcut bir kayna\u011f\u0131 tamamen g\u00fcncellemek veya yoksa olu\u015fturmak i\u00e7in kullan\u0131l\u0131r. \u0130dempotent&#8217;tir.<\/li>\n<li><strong>DELETE:<\/strong> Bir kayna\u011f\u0131 silmek i\u00e7in kullan\u0131l\u0131r. \u0130dempotent&#8217;tir.<\/li>\n<li><strong>PATCH:<\/strong> Mevcut bir kayna\u011f\u0131n k\u0131smi g\u00fcncellemesi i\u00e7in kullan\u0131l\u0131r. Genellikle idempotent de\u011fildir.<\/li>\n<\/ul>\n<p><strong>HTTP Durum Kodlar\u0131:<\/strong> API yan\u0131tlar\u0131n\u0131n sonucunu belirtmek i\u00e7in kullan\u0131l\u0131r (\u00f6rn: 200 OK, 201 Created, 400 Bad Request, 404 Not Found, 500 Internal Server Error).<\/p>\n<p><strong>\u00d6rnek RESTful \u0130stek ve Yan\u0131t (JSON):<\/strong><\/p>\n<pre><code>\n\/\/ GET Request\nGET \/api\/products\/123 HTTP\/1.1\nHost: example.com\nAccept: application\/json\n\n\/\/ GET Response\nHTTP\/1.1 200 OK\nContent-Type: application\/json\n\n{\n    \"id\": \"123\",\n    \"name\": \"Ak\u0131ll\u0131 Telefon X\",\n    \"price\": 999.99,\n    \"currency\": \"USD\",\n    \"links\": [\n        {\"rel\": \"self\", \"href\": \"\/api\/products\/123\"},\n        {\"rel\": \"category\", \"href\": \"\/api\/categories\/electronics\"}\n    ]\n}\n\n\/\/ POST Request\nPOST \/api\/products HTTP\/1.1\nHost: example.com\nContent-Type: application\/json\n\n{\n    \"name\": \"Yeni \u00dcr\u00fcn Y\",\n    \"price\": 49.99,\n    \"currency\": \"EUR\"\n}\n\n\/\/ POST Response\nHTTP\/1.1 201 Created\nLocation: \/api\/products\/456\nContent-Type: application\/json\n\n{\n    \"id\": \"456\",\n    \"name\": \"Yeni \u00dcr\u00fcn Y\",\n    \"price\": 49.99,\n    \"currency\": \"EUR\"\n}\n<\/code><\/pre>\n<h3>REST&#8217;in Avantajlar\u0131 ve Dezavantajlar\u0131<\/h3>\n<ul>\n<li><strong>Avantajlar\u0131:<\/strong>\n<ul>\n<li>Hafif ve basit.<\/li>\n<li>HTTP&#8217;yi do\u011frudan kulland\u0131\u011f\u0131 i\u00e7in kolay anla\u015f\u0131l\u0131r ve uygulanabilir.<\/li>\n<li>JSON gibi hafif veri formatlar\u0131 ile h\u0131zl\u0131 performans.<\/li>\n<li>\u00d6l\u00e7eklenebilirlik ve esneklik.<\/li>\n<li>Mobil ve web uygulamalar\u0131 i\u00e7in ideal.<\/li>\n<li>Daha h\u0131zl\u0131 geli\u015ftirme s\u00fcreci.<\/li>\n<\/ul>\n<\/li>\n<li><strong>Dezavantajlar\u0131:<\/strong>\n<ul>\n<li>SOAP&#8217;taki gibi yerle\u015fik g\u00fcvenlik veya i\u015flem deste\u011fi yok (HTTP\/TLS, OAuth gibi ek mekanizmalar gerekir).<\/li>\n<li>Resmi bir s\u00f6zle\u015fme dili yok (OpenAPI\/Swagger gibi ara\u00e7lar kullan\u0131l\u0131r).<\/li>\n<li>HATEOAS prensibini tam olarak uygulamak zor olabilir.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h3>M\u00fclakat Sorular\u0131: RESTful<\/h3>\n<ol>\n<li><strong>RESTful servis nedir ve temel prensipleri nelerdir?<\/strong>\n<p><em>Yan\u0131t:<\/em> RESTful servis, Representational State Transfer (Temsili Durum Aktar\u0131m\u0131) mimari stiline uyan bir web servisidir. Temel prensipleri; istemci-sunucu ayr\u0131m\u0131, durumsuzluk (statelessness), \u00f6nbelleklenebilirlik (cacheable), katmanl\u0131 sistem ve tekd\u00fczen aray\u00fczd\u00fcr (uniform interface).<\/p>\n<\/li>\n<li><strong>Stateless (Durumsuz) ne demektir ve neden \u00f6nemlidir?<\/strong>\n<p><em>Yan\u0131t:<\/em> Stateless, sunucunun her istemci iste\u011fini ba\u011f\u0131ms\u0131z olarak ele almas\u0131 ve \u00f6nceki isteklerden herhangi bir oturum veya durum bilgisi saklamamas\u0131 anlam\u0131na gelir. Bu, sunucunun daha kolay \u00f6l\u00e7eklenmesini sa\u011flar, \u00e7\u00fcnk\u00fc herhangi bir sunucu iste\u011fi i\u015fleyebilir ve sunucu ar\u0131zalar\u0131 istemci deneyimini daha az etkiler.<\/p>\n<\/li>\n<li><strong>Idempotent nedir? Hangi HTTP metotlar\u0131 idempotenttir?<\/strong>\n<p><em>Yan\u0131t:<\/em> Idempotent bir i\u015flem, ayn\u0131 iste\u011fin birden \u00e7ok kez tekrarlanmas\u0131n\u0131n sistem \u00fczerinde ayn\u0131 etkiyi yaratmas\u0131d\u0131r. Yani, ilk \u00e7a\u011fr\u0131dan sonra yap\u0131lan ek \u00e7a\u011fr\u0131lar\u0131n sistem durumunu de\u011fi\u015ftirmemesi veya ayn\u0131 sonucu \u00fcretmesidir. GET, PUT ve DELETE metotlar\u0131 idempotenttir. POST metodu ise idempotent de\u011fildir \u00e7\u00fcnk\u00fc her \u00e7a\u011fr\u0131da yeni bir kaynak olu\u015fturabilir.<\/p>\n<\/li>\n<li><strong>HATEOAS nedir ve neden \u00f6nemlidir?<\/strong>\n<p><em>Yan\u0131t:<\/em> HATEOAS (Hypermedia as the Engine of Application State), REST mimarisinin Uniform Interface k\u0131s\u0131tlamas\u0131n\u0131n bir par\u00e7as\u0131d\u0131r. Bir kayna\u011f\u0131n temsilinde, istemcinin uygulaman\u0131n durumunu de\u011fi\u015ftirmek i\u00e7in kullanabilece\u011fi ba\u011flant\u0131lar (hypermedia linkleri) i\u00e7ermesi gerekti\u011fini belirtir. Bu, istemcinin API&#8217;yi statik URL&#8217;lere ba\u011fl\u0131 kalmadan dinamik olarak ke\u015ffetmesini ve etkile\u015fimde bulunmas\u0131n\u0131 sa\u011flar, b\u00f6ylece API evrildik\u00e7e istemci kodunun daha az de\u011fi\u015fmesini sa\u011flar.<\/p>\n<\/li>\n<li><strong>REST API tasar\u0131m\u0131nda dikkat edilmesi gerekenler nelerdir?<\/strong>\n<p><em>Yan\u0131t:<\/em> Kaynaklar\u0131 a\u00e7\u0131k\u00e7a tan\u0131mlayan URI&#8217;lar kullanmak, do\u011fru HTTP metotlar\u0131n\u0131 kullanmak, anlaml\u0131 HTTP durum kodlar\u0131 d\u00f6nd\u00fcrmek, JSON gibi hafif veri formatlar\u0131n\u0131 tercih etmek, s\u00fcr\u00fcmleme yapmak (\u00f6rn: \/v1\/products), kimlik do\u011frulama ve yetkilendirme mekanizmalar\u0131 kullanmak, ve HATEOAS prensibini m\u00fcmk\u00fcn oldu\u011funca uygulamak.<\/p>\n<\/li>\n<\/ol>\n<h2>SOAP vs. REST Kar\u015f\u0131la\u015ft\u0131rmas\u0131 ve Pratik Senaryolar<\/h2>\n<p>SOAP ve REST aras\u0131ndaki se\u00e7im, projenin gereksinimlerine ve ba\u011flam\u0131na ba\u011fl\u0131d\u0131r. \u0130\u015fte temel kar\u015f\u0131la\u015ft\u0131rma ve ne zaman hangisinin tercih edilece\u011fine dair pratik bilgiler:<\/p>\n<h3>Temel Farklar Tablosu<\/h3>\n<table border=\"1\" cellpadding=\"5\" cellspacing=\"0\">\n<thead>\n<tr>\n<th>\u00d6zellik<\/th>\n<th>SOAP<\/th>\n<th>REST<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td><strong>Mimari Stil \/ Protokol<\/strong><\/td>\n<td>Protokol<\/td>\n<td>Mimari Stil<\/td>\n<\/tr>\n<tr>\n<td><strong>Veri Format\u0131<\/strong><\/td>\n<td>XML (zorunlu)<\/td>\n<td>JSON (tercih edilen), XML, HTML vb.<\/td>\n<\/tr>\n<tr>\n<td><strong>Ta\u015f\u0131ma Protokol\u00fc<\/strong><\/td>\n<td>HTTP, SMTP, JMS, FTP vb.<\/td>\n<td>HTTP\/HTTPS (zorunlu)<\/td>\n<\/tr>\n<tr>\n<td><strong>S\u00f6zle\u015fme<\/strong><\/td>\n<td>WSDL ile s\u0131k\u0131 s\u00f6zle\u015fme<\/td>\n<td>Resmi s\u00f6zle\u015fme yok (OpenAPI\/Swagger kullan\u0131l\u0131r)<\/td>\n<\/tr>\n<tr>\n<td><strong>Durum Y\u00f6netimi<\/strong><\/td>\n<td>Durumlu olabilir<\/td>\n<td>Durumsuz (Stateless)<\/td>\n<\/tr>\n<tr>\n<td><strong>G\u00fcvenlik<\/strong><\/td>\n<td>WS-Security (yerle\u015fik)<\/td>\n<td>SSL\/TLS, OAuth, JWT (ek mekanizmalar)<\/td>\n<\/tr>\n<tr>\n<td><strong>Performans<\/strong><\/td>\n<td>Daha yava\u015f (XML verbosity)<\/td>\n<td>Daha h\u0131zl\u0131 (hafif veri, \u00f6nbellekleme)<\/td>\n<\/tr>\n<tr>\n<td><strong>Karma\u015f\u0131kl\u0131k<\/strong><\/td>\n<td>Daha karma\u015f\u0131k<\/td>\n<td>Daha basit<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h3>Ne Zaman Hangisini Kullanmal\u0131?<\/h3>\n<ul>\n<li><strong>SOAP Kullan\u0131m Senaryolar\u0131:<\/strong>\n<ul>\n<li><strong>Kurumsal Uygulamalar:<\/strong> B\u00fcy\u00fck \u015firketlerdeki eski sistemlerle entegrasyon.<\/li>\n<li><strong>Finansal \u0130\u015flemler:<\/strong> Bankac\u0131l\u0131k, sigortac\u0131l\u0131k gibi y\u00fcksek g\u00fcvenlik, i\u015flem b\u00fct\u00fcnl\u00fc\u011f\u00fc (ACID) ve g\u00fcvenilirlik gerektiren alanlar.<\/li>\n<li><strong>Resmi S\u00f6zle\u015fme Gereksinimi:<\/strong> Servislerin \u00e7ok s\u0131k\u0131 tan\u0131mlanmas\u0131 ve de\u011fi\u015ftirilemez bir s\u00f6zle\u015fmeye sahip olmas\u0131 gereken durumlar.<\/li>\n<li><strong>Da\u011f\u0131t\u0131k \u0130\u015flemler:<\/strong> Birden fazla servisin tek bir i\u015flemde birle\u015fti\u011fi senaryolar.<\/li>\n<\/ul>\n<\/li>\n<li><strong>REST Kullan\u0131m Senaryolar\u0131:<\/strong>\n<ul>\n<li><strong>Mobil Uygulamalar:<\/strong> Hafif, h\u0131zl\u0131 ve d\u00fc\u015f\u00fck bant geni\u015fli\u011fi dostu oldu\u011fu i\u00e7in idealdir.<\/li>\n<li><strong>Web Uygulamalar\u0131 (SPA&#8217;lar):<\/strong> React, Angular, Vue gibi framework&#8217;lerle geli\u015ftirilen uygulamalar.<\/li>\n<li><strong>Mikro Servisler:<\/strong> Ba\u011f\u0131ms\u0131z, k\u00fc\u00e7\u00fck ve h\u0131zl\u0131 servislerin birbirleriyle ileti\u015fim kurmas\u0131 gereken mimariler.<\/li>\n<li><strong>Herkese A\u00e7\u0131k API&#8217;ler:<\/strong> \u00dc\u00e7\u00fcnc\u00fc taraf geli\u015ftiricilerin kolayca entegre olabilmesi i\u00e7in basit ve standart tabanl\u0131 API&#8217;ler.<\/li>\n<li><strong>IoT Cihazlar\u0131:<\/strong> Kaynak k\u0131s\u0131tl\u0131 cihazlar i\u00e7in hafif ileti\u015fim.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p><strong>Pratik Bilgi:<\/strong> Yeni projelerin \u00e7o\u011fu, esnekli\u011fi, basitli\u011fi ve performans avantajlar\u0131 nedeniyle RESTful mimariyi tercih etmektedir. Ancak, mevcut bir SOAP servisiyle entegrasyon yapman\u0131z gerekiyorsa, SOAP&#8217;u anlamak ve kullanmak zorunlu hale gelir.<\/p>\n<h2>Sonu\u00e7 ve S\u0131k\u00e7a Sorulan Sorular (SSS)<\/h2>\n<p>Web servisleri, modern yaz\u0131l\u0131m mimarilerinin temel ta\u015flar\u0131ndan biridir. SOAP ve RESTful mimarileri aras\u0131ndaki farklar\u0131, avantajlar\u0131 ve dezavantajlar\u0131 anlamak, bir yaz\u0131l\u0131m geli\u015ftiricinin yetenek setinde kritik bir beceridir. M\u00fclakatlarda bu konulara hakim olmak, teknik bilginizi ve problem \u00e7\u00f6zme yetene\u011finizi sergilemenizi sa\u011flayacakt\u0131r. Her iki yakla\u015f\u0131m\u0131n da kendine \u00f6zg\u00fc kullan\u0131m durumlar\u0131 oldu\u011funu unutmay\u0131n ve projenizin gereksinimlerine en uygun olan\u0131 se\u00e7meye \u00f6zen g\u00f6sterin.<\/p>\n<h3>S\u0131k\u00e7a Sorulan Sorular (SSS)<\/h3>\n<ol>\n<li><strong>Web servisleri neden kullan\u0131l\u0131r?<\/strong>\n<p><em>Yan\u0131t:<\/em> Farkl\u0131 platformlarda, farkl\u0131 dillerde yaz\u0131lm\u0131\u015f uygulamalar\u0131n a\u011f \u00fczerinden g\u00fcvenli, standart ve etkin bir \u015fekilde ileti\u015fim kurmas\u0131n\u0131 sa\u011flamak, veri al\u0131\u015fveri\u015fi yapmak ve da\u011f\u0131t\u0131k sistemler olu\u015fturmak i\u00e7in kullan\u0131l\u0131r.<\/p>\n<\/li>\n<li><strong>SOAP ve REST aras\u0131ndaki en temel fark nedir?<\/strong>\n<p><em>Yan\u0131t:<\/em> SOAP bir protokold\u00fcr (XML tabanl\u0131, s\u0131k\u0131 kurall\u0131), REST ise bir mimari stildir (HTTP tabanl\u0131, kaynak odakl\u0131, daha esnek).<\/p>\n<\/li>\n<li><strong>RESTful API&#8217;lerde durum y\u00f6netimi (state management) nas\u0131l yap\u0131l\u0131r?<\/strong>\n<p><em>Yan\u0131t:<\/em> RESTful API&#8217;ler do\u011fas\u0131 gere\u011fi durumsuzdur (stateless). Yani sunucu, istemcinin durumunu saklamaz. \u0130stemci her istekte gerekli t\u00fcm bilgiyi (\u00f6rn. kimlik do\u011frulama token&#8217;\u0131) g\u00f6ndermelidir. Oturum y\u00f6netimi genellikle istemci taraf\u0131nda veya token tabanl\u0131 kimlik do\u011frulama (JWT gibi) ile yap\u0131l\u0131r.<\/p>\n<\/li>\n<li><strong>HTTP metotlar\u0131 aras\u0131nda farklar nelerdir?<\/strong>\n<p><em>Yan\u0131t:<\/em> GET (okuma), POST (olu\u015fturma), PUT (tam g\u00fcncelleme\/olu\u015fturma), DELETE (silme), PATCH (k\u0131smi g\u00fcncelleme). GET, PUT, DELETE idempotenttir, POST ve PATCH genellikle de\u011fildir.<\/p>\n<\/li>\n<li><strong>API Gateway nedir, ne i\u015fe yarar?<\/strong>\n<p><em>Yan\u0131t:<\/em> API Gateway, istemcilerden gelen t\u00fcm API \u00e7a\u011fr\u0131lar\u0131n\u0131 alan ve bunlar\u0131 uygun mikro servislere veya arka u\u00e7 sistemlerine y\u00f6nlendiren tek bir giri\u015f noktas\u0131d\u0131r. Kimlik do\u011frulama\/yetkilendirme, h\u0131z s\u0131n\u0131rlama, izleme, loglama, y\u00fck dengeleme gibi i\u015flevleri merkezi olarak y\u00f6netir. \u00d6zellikle mikro servis mimarilerinde \u00e7ok yayg\u0131nd\u0131r.<\/p>\n<\/li>\n<li><strong>Microservices mimarisinde hangi web servis tipi daha \u00e7ok tercih edilir?<\/strong>\n<p><em>Yan\u0131t:<\/em> Mikro servis mimarilerinde genellikle RESTful servisler tercih edilir. Bunun nedenleri; hafif olmalar\u0131, h\u0131zl\u0131 geli\u015ftirme sa\u011flamalar\u0131, JSON gibi hafif veri formatlar\u0131n\u0131 kullanmalar\u0131 ve HTTP&#8217;nin standart \u00f6zelliklerinden faydalanmalar\u0131d\u0131r.<\/p>\n<\/li>\n<\/ol>\n<p><\/body><\/p>\n","protected":false},"excerpt":{"rendered":"Giri\u015f: Web Servislerinin \u00d6nemi ve M\u00fclakatlarda Yeri\nG\u00fcn\u00fcm\u00fcz yaz\u0131l\u0131m d\u00fcnyas\u0131nda, uygulamalar\u0131n birbirleriyle sorunsuz bir \u015fekilde ileti\u015f","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-39344","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) - 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