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  • Javascript
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    • Javascript Runtime Env
      • Event loops
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    • Module Patterns in JS - CommonJS, AMD and ES6 classes
    • Lexical Environment in JS
    • var vs let/const
    • Temporal Dead Zone (TDZ)
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    • 'this' keyword
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    • JS : Object Oriented Programming
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      • Creating Object in Javascript
    • NaN
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      • Object's own properties
    • use strict mode
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    • Promise
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    • XHR Request
    • Promise Error: Catch vs Error Function in Then
    • Immutability
    • Useful Code samples
    • window, document, screen
    • window.innerheight, outer height, screen.height
    • JS Design Patters
    • Interview Questions
    • Encapsulation - Module Patterns in JS
    • Redesigning services using Entity framework approach
  • JS Functions
    • JS Array - Slice vs Splice
  • PWA
    • What is PWA
  • ES6
    • Sets
    • Maps
    • spread vs destructure operator
  • Web
    • http / https
    • CORS
    • CSRF
    • XSS Attack
    • What is SPA
    • Semantic Elements in HTML
  • Angular 4
    • Angular vs React
    • Change Detection
    • Lazy Loading of modules
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    • AOT Compilation
    • Route Guards
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    • LifeCycle Hooks
    • ngRx
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      • Temp
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        • ngForTemp
        • ngSwitch
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        • ngIf
      • Attribute Directives
        • temp
        • ngClass
        • ngStyle
    • Routing
      • Routing in Angular
      • Setting up basic routing
      • routerLink and routerLinkActive
      • router.navigate and ActivatedRoute
      • Route Params as Observables
      • redirectTo
      • relativeTo
      • pathMatch
      • ActivatedRoute
      • Routing in Angular
      • Passing Data with Route
      • Route Parameters
    • Intercept HTTP request
    • Custom Directives
    • Communication between components
    • Angular Modules
    • Reactive Forms
    • Unit Testing
      • TestBed and component fixture
      • Testing HttpClient requests
      • Testing fakeAsync
  • GraphQL
    • Introduction
    • Server
    • Client Side
    • GraphQL in Angular
    • Queries
      • temp
      • query with parameters
      • aliases
      • fragments
      • @include directive
      • @skip directive
      • variables
      • Inline Fragments
  • CSS
    • What is Box model?
    • display: block, inline or inline-block
    • CSS Selector: Combinators
    • CSS Pseudo-classes
    • CSS Pseudo-elements
    • CSS3 Filter
    • CSS3 Transitions
    • Media Queries
    • Flex vs Grid
    • CSS 3 Grids
    • What is Flexbox?
    • position: relative vs absolute
  • SASS
    • Mixins
    • Lists
    • Maps
  • RxJS
    • throttle vs debounceTime
    • distinctUnitChange
    • reduce vs scan
  • Typescript
    • Typeguards
    • Pattern Matching with Typescript
    • TS Decorators
    • Using LINQ in TS
  • NodeJS
    • NodeJS Security Checklist
    • What is Node.js
  • REACT
    • React - VDOM - Under the hood
    • Synthetic events in React
    • Routing - React Router 4
    • React Custom hook
    • Higher-Order Component
    • REDUX
    • Redux Thunk vs Redux Saga
    • forceUpdate()
    • Storing Data in React
    • Error Handling
    • React Context
    • How React-Native works
    • refs
    • Server-side Rendering
    • Jest setup file
    • React-test-renderer
    • Lifecycle
    • React Testing Library
    • React Query
  • JWT
    • What is JWT and How it works
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On this page
  • Cross Origin resource sharing
  • Why Browsers make a pre-flight request to a server before making a call to API
  1. Web

CORS

Cross Origin Resource Sharing

Previoushttp / httpsNextCSRF

Last updated 2 years ago

<< add link to an excellent CORS explaining resource >>

Cross Origin resource sharing

= share resources/API/data across origins implementing some security rules and whitelist/blacklist specific domains to access resources

Why Browsers make a pre-flight request to a server before making a call to API

What is the motivation behind the introduction of preflight CORS requests?Stack Overflow
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