Cross-origin resource sharing (CORS) is a mechanism that allows restricted resources on a web page to be requested from another domain outside the domain from which the first restricted resource was served. For example, an HTML page of a web application served from http://domain-a.com makes an <img src > request for a different domain as 'domain-b.com' to get an image via an API request. For security reasons, browsers restrict cross-origin HTTP requests initiated from within scripts as in above example and only allows to make HTTP requests to its own domain. To avoid this limitation modern browsers have been used CORS standard to allow cross domain requests. Modern browsers use CORS in an API container - such as XMLHttpRequest or Fetch - to mitigate risks of cross-origin HTTP requests.Thing to note is it's not only sufficient that the browsers handle client side of cross-origin sharing,but also the servers f...