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Cross-origin resource sharing (CORS)

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Cross-origin resource sharing (CORS) is a mechanism that allows restricted resources on a web page to be accessed from another domain outside the domain from which the first resource was served. CORS also relies on a mechanism by which browsers make a "preflight" request to the server hosting the cross-origin resource, in order to check that the server will permit the actual request. In that preflight, the browser sends headers that indicate the HTTP method and headers that will be used in the actual request. For security reasons, browsers restrict cross-origin HTTP requests initiated from scripts. For example, fetch() and XMLHttpRequest follow the same-origin policy. This means that a web application using those APIs can only request resources from the same origin the application was loaded from unless the response from other origins includes the right CORS headers.

Resource types

  • Invocations of fetch() or XMLHttpRequest
  • Web Fonts (for cross-domain font usage in @font-face within CSS), so that servers can deploy TrueType fonts that can only be loaded cross-origin and used by websites that are permitted to do so
  • WebGL textures
  • Images/video frames drawn to a canvas using drawImage()
  • CSS shapes from images
  • scripts
  • iframes

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andres11152 / Don_kampo_api

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This is the backend API for an e-commerce platform where individual customers can purchase items like fruits and vegetables, while businesses can order these items at wholesale prices directly from the central supply market, paying only the delivery fee. The API is built with Node.js and Express, utilizing PostgreSQL for database management.

nodejs javascript cors babel express node nodemon postgree postgreesql nodemon-express
  • Updated Nov 17, 2024
  • JavaScript

BaranDev / emurpg-backend

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The 🐲EMU RPG API🐲 supports the EMU RPG Club’s events by managing game tables, players, and D&D character data. Built with FastAPI, it includes features like table/character management, real-time WebSocket updates, data validation, API monitoring, and secure access, providing an organized backend for tabletop RPG sessions.

python api cors mongodb dungeons-and-dragons websockets openai asyncio matplotlib restful-api moesif csv-processing pydantic fastapi pdf-processing medieval-theme
  • Updated Nov 17, 2024
  • Python

Created by WHATWG, Matt Oshry, Brad Porter, Michael Bodell, Tellme Networks

Released May 2006

Followers
13 followers
Website
fetch.spec.whatwg.org/#http-cors-protocol
Wikipedia
Wikipedia

Related Topics

ajax content-security-policy jsonp xhr