Cross-Origin Resource Sharing (CORS)
A Cross-Origin Resource Sharing (CORS) is a HTTP-header based mechanism that allows a server to indicate any origins other than its own from which a browser should permit loading resources
References
2023
- (Wikipedia, 2023) ⇒ https://en.wikipedia.org/wiki/Cross-origin_resource_sharing Retrieved:2023-9-15.
- 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.
A web page may freely embed cross-origin images, stylesheets, scripts, iframes, and videos. Certain "cross-domain" requests, notably Ajax requests, are forbidden by default by the same-origin security policy. CORS defines a way in which a browser and server can interact to determine whether it is safe to allow the cross-origin request. It allows for more freedom and functionality than purely same-origin requests, but is more secure than simply allowing all cross-origin requests. The specification for CORS is included as part of the WHATWG's Fetch Living Standard. This specification describes how CORS is currently implemented in browsers. An earlier specification was published as a W3C Recommendation.
- 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.
2023
- GBard
- … CORS is an extension of the same-origin policy (SOP), which is a security feature that prevents a web page from accessing resources from other domains. The SOP is designed to protect users from malicious websites that could try to steal their data or perform other harmful actions.
CORS allows web developers to specify which domains are allowed to access their resources. This allows for more flexibility and functionality than the SOP, while still maintaining a high level of security.
To enable CORS, the server that hosts the resource must send certain HTTP headers in the response. These headers tell the browser which domains are allowed to access the resource.
- The following are some of the most important CORS headers:
- Access-Control-Allow-Origin: This header specifies the domains that are allowed to access the resource.
- … CORS is an extension of the same-origin policy (SOP), which is a security feature that prevents a web page from accessing resources from other domains. The SOP is designed to protect users from malicious websites that could try to steal their data or perform other harmful actions.
Access-Control-Allow-Methods: This header specifies the HTTP methods that are allowed to be used to access the resource. Access-Control-Allow-Headers: This header specifies the HTTP headers that are allowed to be sent with the request. Access-Control-Max-Age: This header specifies how long the browser should cache the CORS response.
2023
- BingChat
- Cross-Origin Resource Sharing (CORS) is an HTTP-header based mechanism that allows a server to indicate any origins (domain, scheme, or port) other than its own from which a browser should permit loading resources 1. It is a security feature implemented by web browsers to restrict web pages from making requests to a different domain than the one that served the original request.
CORS works by adding new HTTP headers that let servers describe which origins are permitted to read that information from a web browser. When a web page makes a cross-origin request, the browser sends an HTTP OPTIONS request to the server hosting the cross-origin resource to check if the server will permit the actual request. The browser sends headers that indicate the HTTP method and headers that will be used in the actual request 1. If the server approves, it sends back an HTTP 200 OK response with the appropriate CORS headers. The browser then sends the actual request.
CORS supports secure cross-origin requests and data transfers between browsers and servers 1. It enables cross-origin HTTP requests for invocations of the XMLHttpRequest or Fetch APIs, Web Fonts, WebGL textures, images/video frames drawn to a canvas using drawImage(), CSS Shapes from images, and more 1.
- Cross-Origin Resource Sharing (CORS) is an HTTP-header based mechanism that allows a server to indicate any origins (domain, scheme, or port) other than its own from which a browser should permit loading resources 1. It is a security feature implemented by web browsers to restrict web pages from making requests to a different domain than the one that served the original request.