Cross-origin resource sharing (CORS)
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()
orXMLHttpRequest
- 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
Here are 4,574 public repositories matching this topic...
Internet Engineering presentation: CORS.
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Dec 8, 2022 - JavaScript
CORS Serving with Python
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Mar 26, 2023 - Python
HTTP cross-origin resource sharing(CORS) middleware
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Apr 21, 2023 - TypeScript
A lightweight proxy application where the client can define the request to the target.
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Sep 11, 2023 - Go
A CORS proxy implemented in Python.
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Jan 22, 2023 - Python
Put here js code that fixes obvious bad things on sites (like ads)
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Jun 7, 2017 - JavaScript
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Jun 16, 2020 - Java
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Aug 15, 2017 - JavaScript
An App that indexes and maps noSql(Json) documents using an Elasticsearch plugin.
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Jun 19, 2018 - JavaScript
Cross origin demos includes JSONP CORS Window.domain Window.name PostMessage and proxy
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Jan 15, 2019 - JavaScript
Created by WHATWG, Matt Oshry, Brad Porter, Michael Bodell, Tellme Networks
Released May 2006
- Followers
- 12 followers
- Website
- fetch.spec.whatwg.org/#http-cors-protocol
- Wikipedia
- Wikipedia