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Ways to apply Cross origin Domain XMLHttpRequest

Cross Origin Domain XMLHttpRequest
Over the years, JavaScript and Web programming have grown tremendously seeing several revisions and changes to suit modern day needs, yet the same origin policy remains.  The fundamental purpose of this policy is to prevent JavaScript from making requests across domain boundaries, in the process instigating various hacks for making cross-domain requests. Here’s where Cross-Origin Resource Sharing (CORS) helps. Web administrators, server developers and front-end developers are the likely lot who find this technology more useful when they need to access resources across domains, servers, protocol or port. 

Additional HTTP headers are used to gain permission to access resources from a different domain server, protocol or port than the one from which the current document originated. It is to be noted that, modern browsers to mitigate any risks during cross-origin HTTP request use XMLHttpRequest or Fetch.

Cross Origin Domain XMLHttpRequest is detailly discussed here https://goo.gl/LRxSFv
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